package com.fasterxml.jackson.databind;

import java.lang.annotation.Annotation;
import java.util.*;

import com.fasterxml.jackson.annotation.*;
import com.fasterxml.jackson.core.Version;
import com.fasterxml.jackson.core.Versioned;

import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.fasterxml.jackson.databind.cfg.MapperConfig;
import com.fasterxml.jackson.databind.deser.ValueInstantiator;
import com.fasterxml.jackson.databind.introspect.*;
import com.fasterxml.jackson.databind.jsontype.NamedType;
import com.fasterxml.jackson.databind.jsontype.TypeResolverBuilder;
import com.fasterxml.jackson.databind.ser.BeanPropertyWriter;
import com.fasterxml.jackson.databind.util.Converter;
import com.fasterxml.jackson.databind.util.NameTransformer;

Abstract class that defines API used for introspecting annotation-based
configuration for serialization and deserialization. Separated
so that different sets of annotations can be supported, and support
plugged-in dynamically.

Although default implementations are based on using annotations as the only
(or at least main) information source, custom implementations are not limited
in such a way, and in fact there is no expectation they should be. So the name
is bit of misnomer; this is a general configuration introspection facility.

NOTE: due to rapid addition of new methods (and changes to existing methods),
it is strongly recommended that custom implementations should not directly extend this class, but rather extend NopAnnotationIntrospector. This way added methods will not break backwards compatibility of custom annotation introspectors. /**
 * Abstract class that defines API used for introspecting annotation-based
 * configuration for serialization and deserialization. Separated
 * so that different sets of annotations can be supported, and support
 * plugged-in dynamically.
 *<p>
 * Although default implementations are based on using annotations as the only
 * (or at least main) information source, custom implementations are not limited
 * in such a way, and in fact there is no expectation they should be. So the name
 * is bit of misnomer; this is a general configuration introspection facility.
 *<p>
 * NOTE: due to rapid addition of new methods (and changes to existing methods),
 * it is <b>strongly</b> recommended that custom implementations should not directly
 * extend this class, but rather extend {@link NopAnnotationIntrospector}.
 * This way added methods will not break backwards compatibility of custom annotation
 * introspectors.
 */
@SuppressWarnings("serial")
public abstract class AnnotationIntrospector
    implements Versioned, java.io.Serializable
{
    /*
    /**********************************************************
    /* Helper types
    /**********************************************************
     */

    
Value type used with managed and back references; contains type and
logic name, used to link related references
/**
     * Value type used with managed and back references; contains type and
     * logic name, used to link related references
     */
    public static class ReferenceProperty
    {
        public enum Type {
            
Reference property that Jackson manages and that is serialized normally (by serializing reference object), but is used for resolving back references during deserialization. Usually this can be defined by using JsonManagedReference /**
             * Reference property that Jackson manages and that is serialized normally (by serializing
             * reference object), but is used for resolving back references during
             * deserialization.
             * Usually this can be defined by using
             * {@link com.fasterxml.jackson.annotation.JsonManagedReference}
             */
            MANAGED_REFERENCE

            
Reference property that Jackson manages by suppressing it during serialization, and reconstructing during deserialization. Usually this can be defined by using JsonBackReference /**
             * Reference property that Jackson manages by suppressing it during serialization,
             * and reconstructing during deserialization.
             * Usually this can be defined by using
             * {@link com.fasterxml.jackson.annotation.JsonBackReference}
             */
            ,BACK_REFERENCE
            ;
        }

        private final Type _type;
        private final String _name;

        public ReferenceProperty(Type t, String n) {
            _type = t;
            _name = n;
        }

        public static ReferenceProperty managed(String name) { return new ReferenceProperty(Type.MANAGED_REFERENCE, name); }
        public static ReferenceProperty back(String name) { return new ReferenceProperty(Type.BACK_REFERENCE, name); }
        
        public Type getType() { return _type; }
        public String getName() { return _name; }

        public boolean isManagedReference() { return _type == Type.MANAGED_REFERENCE; }
        public boolean isBackReference() { return _type == Type.BACK_REFERENCE; }
    }
    
    /*
    /**********************************************************
    /* Factory methods
    /**********************************************************
     */
    
    
Factory method for accessing "no operation" implementation
of introspector: instance that will never find any annotation-based
configuration.
/**
     * Factory method for accessing "no operation" implementation
     * of introspector: instance that will never find any annotation-based
     * configuration.
     */
    public static AnnotationIntrospector nopInstance() {
        return NopAnnotationIntrospector.instance;
    }

    public static AnnotationIntrospector pair(AnnotationIntrospector a1, AnnotationIntrospector a2) {
        return new AnnotationIntrospectorPair(a1, a2);
    }

    /*
    /**********************************************************
    /* Access to possibly chained introspectors
    /**********************************************************
     */

    
Method that can be used to collect all "real" introspectors that
this introspector contains, if any; or this introspector
if it is not a container. Used to get access to all container
introspectors in their priority order.

Default implementation returns a Singleton list with this introspector
as contents.
This usually works for sub-classes, except for proxy or delegating "container
introspectors" which need to override implementation.
/**
     * Method that can be used to collect all "real" introspectors that
     * this introspector contains, if any; or this introspector
     * if it is not a container. Used to get access to all container
     * introspectors in their priority order.
     *<p>
     * Default implementation returns a Singleton list with this introspector
     * as contents.
     * This usually works for sub-classes, except for proxy or delegating "container
     * introspectors" which need to override implementation.
     */
    public Collection<AnnotationIntrospector> allIntrospectors() {
        return Collections.singletonList(this);
    }
    
    
Method that can be used to collect all "real" introspectors that
this introspector contains, if any; or this introspector
if it is not a container. Used to get access to all container
introspectors in their priority order.

Default implementation adds this introspector in result; this usually
works for sub-classes, except for proxy or delegating "container
introspectors" which need to override implementation.
/**
     * Method that can be used to collect all "real" introspectors that
     * this introspector contains, if any; or this introspector
     * if it is not a container. Used to get access to all container
     * introspectors in their priority order.
     *<p>
     * Default implementation adds this introspector in result; this usually
     * works for sub-classes, except for proxy or delegating "container
     * introspectors" which need to override implementation.
     */
    public Collection<AnnotationIntrospector> allIntrospectors(Collection<AnnotationIntrospector> result) {
        result.add(this);
        return result;
    }
    
    /*
    /**********************************************************
    /* Default Versioned impl
    /**********************************************************
     */

    @Override
    public abstract Version version();
    
    /*
    /**********************************************************
    /* Meta-annotations (annotations for annotation types)
    /**********************************************************
     */

    
Method for checking whether given annotation is considered an
annotation bundle: if so, all meta-annotations it has will
be used instead of annotation ("bundle") itself.
Since:
2.0/**
     * Method for checking whether given annotation is considered an
     * annotation bundle: if so, all meta-annotations it has will
     * be used instead of annotation ("bundle") itself.
     * 
     * @since 2.0
     */
    public boolean isAnnotationBundle(Annotation ann) {
        return false;
    }

    /*
    /**********************************************************
    /* Annotations for Object Id handling
    /**********************************************************
     */
    
    
Method for checking whether given annotated thing
(type, or accessor) indicates that values
referenced (values of type of annotated class, or
values referenced by annotated property; latter
having precedence) should include Object Identifier,
and if so, specify details of Object Identity used.
Since:
2.0/**
     * Method for checking whether given annotated thing
     * (type, or accessor) indicates that values
     * referenced (values of type of annotated class, or
     * values referenced by annotated property; latter
     * having precedence) should include Object Identifier,
     * and if so, specify details of Object Identity used.
     * 
     * @since 2.0
     */
    public ObjectIdInfo findObjectIdInfo(Annotated ann) {
        return null;
    }

    
Method for figuring out additional properties of an Object Identity reference
Since:
2.1/**
     * Method for figuring out additional properties of an Object Identity reference
     * 
     * @since 2.1
     */
    public ObjectIdInfo findObjectReferenceInfo(Annotated ann, ObjectIdInfo objectIdInfo) {
        return objectIdInfo;
    }

    /*
    /**********************************************************
    /* General class annotations
    /**********************************************************
     */

    
Method for locating name used as "root name" (for use by
some serializers when outputting root-level object -- mostly
for XML compatibility purposes) for given class, if one
is defined. Returns null if no declaration found; can return
explicit empty String, which is usually ignored as well as null.
 NOTE: method signature changed in 2.1, to return PropertyName instead of String. /**
     * Method for locating name used as "root name" (for use by
     * some serializers when outputting root-level object -- mostly
     * for XML compatibility purposes) for given class, if one
     * is defined. Returns null if no declaration found; can return
     * explicit empty String, which is usually ignored as well as null.
     *<p> 
     * NOTE: method signature changed in 2.1, to return {@link PropertyName}
     * instead of String.
     */
    public PropertyName findRootName(AnnotatedClass ac) {
        return null;
    }

    
Method for finding information about properties to ignore either by name, or by more general specification ("ignore all unknown"). This method combines multiple aspects of ignorals and deprecates earlier methods such as findPropertiesToIgnore(Annotated, boolean) and findIgnoreUnknownProperties(AnnotatedClass). 
Since:
2.8/**
     * Method for finding information about properties to ignore either by
     * name, or by more general specification ("ignore all unknown").
     * This method combines multiple aspects of ignorals and deprecates
     * earlier methods such as
     * {@link #findPropertiesToIgnore(Annotated, boolean)} and
     * {@link #findIgnoreUnknownProperties(AnnotatedClass)}.
     *
     * @since 2.8
     */
    public JsonIgnoreProperties.Value findPropertyIgnorals(Annotated ac)
    {
        // 18-Oct-2016, tatu: Used to call deprecated methods for backwards
        //   compatibility in 2.8, but not any more in 2.9
        return JsonIgnoreProperties.Value.empty();
    }

    
Method for checking whether properties that have specified type
(class, not generics aware) should be completely ignored for
serialization and deserialization purposes.
Params:
ac – Type to check
Returns:
Boolean.TRUE if properties of type should be ignored;
  Boolean.FALSE if they are not to be ignored, null for default
  handling (which is 'do not ignore')/**
     * Method for checking whether properties that have specified type
     * (class, not generics aware) should be completely ignored for
     * serialization and deserialization purposes.
     * 
     * @param ac Type to check
     * 
     * @return Boolean.TRUE if properties of type should be ignored;
     *   Boolean.FALSE if they are not to be ignored, null for default
     *   handling (which is 'do not ignore')
     */
    public Boolean isIgnorableType(AnnotatedClass ac) { return null; }

    
Method for finding if annotated class has associated filter; and if so,
to return id that is used to locate filter.
Returns:
Id of the filter to use for filtering properties of annotated
   class, if any; or null if none found./**
     * Method for finding if annotated class has associated filter; and if so,
     * to return id that is used to locate filter.
     * 
     * @return Id of the filter to use for filtering properties of annotated
     *    class, if any; or null if none found.
     */
    public Object findFilterId(Annotated ann) { return null; }

    
Method for finding PropertyNamingStrategy for given class, if any specified by annotations; and if so, either return a PropertyNamingStrategy instance, or Class to use for creating instance 
Returns:
Sub-class or instance of PropertyNamingStrategy, if one is specified for given class; null if not.
Since:
2.1/**
     * Method for finding {@link PropertyNamingStrategy} for given
     * class, if any specified by annotations; and if so, either return
     * a {@link PropertyNamingStrategy} instance, or Class to use for
     * creating instance
     * 
     * @return Sub-class or instance of {@link PropertyNamingStrategy}, if one
     *   is specified for given class; null if not.
     * 
     * @since 2.1
     */
    public Object findNamingStrategy(AnnotatedClass ac) { return null; }

    
Method used to check whether specified class defines a human-readable
description to use for documentation.
There are no further definitions for contents; for example, whether
these may be marked up using HTML (or something like wiki format like Markup)
is not defined.
Returns:
Human-readable description, if any.
Since:
2.7/**
     * Method used to check whether specified class defines a human-readable
     * description to use for documentation.
     * There are no further definitions for contents; for example, whether
     * these may be marked up using HTML (or something like wiki format like Markup)
     * is not defined.
     * 
     * @return Human-readable description, if any.
     * 
     * @since 2.7
     */
    public String findClassDescription(AnnotatedClass ac) { return null; }

    
Params:
forSerialization – True if requesting properties to ignore for serialization;
  false if for deserialization
Since:
2.6
Deprecated:
Since 2.8, use findPropertyIgnorals instead/**
     * @param forSerialization True if requesting properties to ignore for serialization;
     *   false if for deserialization
     * 
     * @since 2.6
     *
     * @deprecated Since 2.8, use {@link #findPropertyIgnorals} instead
     */
    @Deprecated // since 2.8
    public String[] findPropertiesToIgnore(Annotated ac, boolean forSerialization) {
        return null;
    }

    
Deprecated:
Since 2.6, use variant that takes second argument./**
     * @deprecated Since 2.6, use variant that takes second argument.
     */
    @Deprecated // since 2.6
    public String[] findPropertiesToIgnore(Annotated ac) {
        return null;
    }

    
Method for checking whether an annotation indicates that all unknown properties
Deprecated:
Since 2.8, use findPropertyIgnorals instead/**
     * Method for checking whether an annotation indicates that all unknown properties
     *
     * @deprecated Since 2.8, use {@link #findPropertyIgnorals} instead
     */
    @Deprecated // since 2.8
    public Boolean findIgnoreUnknownProperties(AnnotatedClass ac) { return null; }
    
    /*
    /**********************************************************
    /* Property auto-detection
    /**********************************************************
     */

    
Method for checking if annotations indicate changes to minimum visibility levels
needed for auto-detecting property elements (fields, methods, constructors).
A baseline checker is given, and introspector is to either return it as is
(if no annotations are found), or build and return a derived instance (using
checker's build methods).
/**
     * Method for checking if annotations indicate changes to minimum visibility levels
     * needed for auto-detecting property elements (fields, methods, constructors).
     * A baseline checker is given, and introspector is to either return it as is
     * (if no annotations are found), or build and return a derived instance (using
     * checker's build methods).
     */
    public VisibilityChecker<?> findAutoDetectVisibility(AnnotatedClass ac, VisibilityChecker<?> checker) {
        return checker;
    }
    
    /*
    /**********************************************************
    /* Annotations for Polymorphic type handling
    /**********************************************************
    */
    
    
Method for checking if given class has annotations that indicate that specific type resolver is to be used for handling instances. This includes not only instantiating resolver builder, but also configuring it based on relevant annotations (not including ones checked with a call to findSubtypes 
Params:
config – Configuration settings in effect (for serialization or deserialization)
ac – Annotated class to check for annotations
baseType – Base java type of value for which resolver is to be found
Returns:
Type resolver builder for given type, if one found; null if none/**
     * Method for checking if given class has annotations that indicate
     * that specific type resolver is to be used for handling instances.
     * This includes not only
     * instantiating resolver builder, but also configuring it based on
     * relevant annotations (not including ones checked with a call to
     * {@link #findSubtypes}
     *
     * @param config Configuration settings in effect (for serialization or deserialization)
     * @param ac Annotated class to check for annotations
     * @param baseType Base java type of value for which resolver is to be found
     * 
     * @return Type resolver builder for given type, if one found; null if none
     */
    public TypeResolverBuilder<?> findTypeResolver(MapperConfig<?> config,
            AnnotatedClass ac, JavaType baseType) {
        return null;
    }

    
Method for checking if given property entity (field or method) has annotations that indicate that specific type resolver is to be used for handling instances. This includes not only instantiating resolver builder, but also configuring it based on relevant annotations (not including ones checked with a call to findSubtypes 
Params:
config – Configuration settings in effect (for serialization or deserialization)
am – Annotated member (field or method) to check for annotations
baseType – Base java type of property for which resolver is to be found
Returns:
Type resolver builder for properties of given entity, if one found;
   null if none/**
     * Method for checking if given property entity (field or method) has annotations
     * that indicate that specific type resolver is to be used for handling instances.
     * This includes not only
     * instantiating resolver builder, but also configuring it based on
     * relevant annotations (not including ones checked with a call to
     * {@link #findSubtypes}
     * 
     * @param config Configuration settings in effect (for serialization or deserialization)
     * @param am Annotated member (field or method) to check for annotations
     * @param baseType Base java type of property for which resolver is to be found
     * 
     * @return Type resolver builder for properties of given entity, if one found;
     *    null if none
     */
    public TypeResolverBuilder<?> findPropertyTypeResolver(MapperConfig<?> config,
            AnnotatedMember am, JavaType baseType) {
        return null;
    }

    
Method for checking if given structured property entity (field or method that has nominal value of Map, Collection or array type) has annotations that indicate that specific type resolver is to be used for handling type information of contained values. This includes not only instantiating resolver builder, but also configuring it based on relevant annotations (not including ones checked with a call to findSubtypes 
Params:
config – Configuration settings in effect (for serialization or deserialization)
am – Annotated member (field or method) to check for annotations
containerType – Type of property for which resolver is to be found (must be a container type)
Returns:
Type resolver builder for values contained in properties of given entity,
   if one found; null if none/**
     * Method for checking if given structured property entity (field or method that
     * has nominal value of Map, Collection or array type) has annotations
     * that indicate that specific type resolver is to be used for handling type
     * information of contained values.
     * This includes not only
     * instantiating resolver builder, but also configuring it based on
     * relevant annotations (not including ones checked with a call to
     * {@link #findSubtypes}
     * 
     * @param config Configuration settings in effect (for serialization or deserialization)
     * @param am Annotated member (field or method) to check for annotations
     * @param containerType Type of property for which resolver is to be found (must be a container type)
     * 
     * @return Type resolver builder for values contained in properties of given entity,
     *    if one found; null if none
     */    
    public TypeResolverBuilder<?> findPropertyContentTypeResolver(MapperConfig<?> config,
            AnnotatedMember am, JavaType containerType) {
        return null;
    }

    
Method for locating annotation-specified subtypes related to annotated
entity (class, method, field). Note that this is only guaranteed to be
a list of directly
declared subtypes, no recursive processing is guarantees (i.e. caller
has to do it if/as necessary)
Params:
a – Annotated entity (class, field/method) to check for annotations/**
     * Method for locating annotation-specified subtypes related to annotated
     * entity (class, method, field). Note that this is only guaranteed to be
     * a list of directly
     * declared subtypes, no recursive processing is guarantees (i.e. caller
     * has to do it if/as necessary)
     * 
     * @param a Annotated entity (class, field/method) to check for annotations
     */
    public List<NamedType> findSubtypes(Annotated a) { return null; }

    
Method for checking if specified type has explicit name.
Params:
ac – Class to check for type name annotations/**
     * Method for checking if specified type has explicit name.
     * 
     * @param ac Class to check for type name annotations
     */
    public String findTypeName(AnnotatedClass ac) { return null; }

    
Method for checking whether given accessor claims to represent
type id: if so, its value may be used as an override,
instead of generated type id.
/**
     * Method for checking whether given accessor claims to represent
     * type id: if so, its value may be used as an override,
     * instead of generated type id.
     */
    public Boolean isTypeId(AnnotatedMember member) { return null; }

    /*
    /**********************************************************
    /* General member (field, method/constructor) annotations
    /**********************************************************
     */

    
Method for checking if given member indicates that it is part
of a reference (parent/child).
/**
     * Method for checking if given member indicates that it is part
     * of a reference (parent/child).
     */
    public ReferenceProperty findReferenceType(AnnotatedMember member) { return null; }

    
Method called to check whether given property is marked to be "unwrapped"
when being serialized (and appropriately handled in reverse direction,
i.e. expect unwrapped representation during deserialization).
Return value is the name transformation to use, if wrapping/unwrapping
should  be done, or null if not -- note that transformation may simply
be identity transformation (no changes).
/**
     * Method called to check whether given property is marked to be "unwrapped"
     * when being serialized (and appropriately handled in reverse direction,
     * i.e. expect unwrapped representation during deserialization).
     * Return value is the name transformation to use, if wrapping/unwrapping
     * should  be done, or null if not -- note that transformation may simply
     * be identity transformation (no changes).
     */
    public NameTransformer findUnwrappingNameTransformer(AnnotatedMember member) { return null; }

    
Method called to check whether given property is marked to
be ignored. This is used to determine whether to ignore
properties, on per-property basis, usually combining
annotations from multiple accessors (getters, setters, fields,
constructor parameters).
/**
     * Method called to check whether given property is marked to
     * be ignored. This is used to determine whether to ignore
     * properties, on per-property basis, usually combining
     * annotations from multiple accessors (getters, setters, fields,
     * constructor parameters).
     */
    public boolean hasIgnoreMarker(AnnotatedMember m) { return false; }

    
Method called to find out whether given member expectes a value to be injected, and if so, what is the identifier of the value to use during injection. Type if identifier needs to be compatible with provider of values (of type InjectableValues); often a simple String id is used. 
Params:
m – Member to check
Returns:
Identifier of value to inject, if any; null if no injection
  indicator is found
Since:
2.9/**
     * Method called to find out whether given member expectes a value
     * to be injected, and if so, what is the identifier of the value
     * to use during injection.
     * Type if identifier needs to be compatible with provider of
     * values (of type {@link InjectableValues}); often a simple String
     * id is used.
     * 
     * @param m Member to check
     * 
     * @return Identifier of value to inject, if any; null if no injection
     *   indicator is found
     *
     * @since 2.9
     */
    public JacksonInject.Value findInjectableValue(AnnotatedMember m) {
        // 05-Apr-2017, tatu: Just for 2.9, call deprecated method to help
        //    with some cases of overrides for legacy code
        Object id = findInjectableValueId(m);
        if (id != null) {
            return JacksonInject.Value.forId(id);
        }
        return null;
    }

    
Method that can be called to check whether this member has
an annotation that suggests whether value for matching property
is required or not.
/**
     * Method that can be called to check whether this member has
     * an annotation that suggests whether value for matching property
     * is required or not.
     */
    public Boolean hasRequiredMarker(AnnotatedMember m) { return null; }

    
Method for checking if annotated property (represented by a field or
getter/setter method) has definitions for views it is to be included in.
If null is returned, no view definitions exist and property is always
included (or always excluded as per default view inclusion configuration);
otherwise it will only be included for views included in returned
array. View matches are checked using class inheritance rules (sub-classes
inherit inclusions of super-classes)
 Since 2.9 this method may also be called to find "default view(s)" for AnnotatedClass 
Params:
a – Annotated property (represented by a method, field or ctor parameter)
Returns:
Array of views (represented by classes) that the property is included in;
   if null, always included (same as returning array containing Object.class)/**
     * Method for checking if annotated property (represented by a field or
     * getter/setter method) has definitions for views it is to be included in.
     * If null is returned, no view definitions exist and property is always
     * included (or always excluded as per default view inclusion configuration);
     * otherwise it will only be included for views included in returned
     * array. View matches are checked using class inheritance rules (sub-classes
     * inherit inclusions of super-classes)
     *<p>
     * Since 2.9 this method may also be called to find "default view(s)" for
     * {@link AnnotatedClass}
     * 
     * @param a Annotated property (represented by a method, field or ctor parameter)
     * @return Array of views (represented by classes) that the property is included in;
     *    if null, always included (same as returning array containing <code>Object.class</code>)
     */
    public Class<?>[] findViews(Annotated a) { return null; }

    
Method for finding format annotations for property or class.
Return value is typically used by serializers and/or
deserializers to customize presentation aspects of the
serialized value.
Since:
2.1/**
     * Method for finding format annotations for property or class.
     * Return value is typically used by serializers and/or
     * deserializers to customize presentation aspects of the
     * serialized value.
     * 
     * @since 2.1
     */
    public JsonFormat.Value findFormat(Annotated memberOrClass) {
        return JsonFormat.Value.empty();
    }

    
Method used to check if specified property has annotation that indicates
that it should be wrapped in an element; and if so, name to use.
Note that not all serializers and deserializers support use this method:
currently (2.1) it is only used by XML-backed handlers.
Returns:
Wrapper name to use, if any, or PropertyName.USE_DEFAULT to indicate that no wrapper element should be used.
Since:
2.1/**
     * Method used to check if specified property has annotation that indicates
     * that it should be wrapped in an element; and if so, name to use.
     * Note that not all serializers and deserializers support use this method:
     * currently (2.1) it is only used by XML-backed handlers.
     * 
     * @return Wrapper name to use, if any, or {@link PropertyName#USE_DEFAULT}
     *   to indicate that no wrapper element should be used.
     * 
     * @since 2.1
     */
    public PropertyName findWrapperName(Annotated ann) { return null; }

    
Method for finding suggested default value (as simple textual serialization)
for the property. While core databind does not make any use of it, it is exposed
for extension modules to use: an expected use is generation of schema representations
and documentation.
Since:
2.5/**
     * Method for finding suggested default value (as simple textual serialization)
     * for the property. While core databind does not make any use of it, it is exposed
     * for extension modules to use: an expected use is generation of schema representations
     * and documentation.
     *
     * @since 2.5
     */
    public String findPropertyDefaultValue(Annotated ann) { return null; }

    
Method used to check whether specified property member (accessor
or mutator) defines human-readable description to use for documentation.
There are no further definitions for contents; for example, whether
these may be marked up using HTML is not defined.
Returns:
Human-readable description, if any.
Since:
2.3/**
     * Method used to check whether specified property member (accessor
     * or mutator) defines human-readable description to use for documentation.
     * There are no further definitions for contents; for example, whether
     * these may be marked up using HTML is not defined.
     * 
     * @return Human-readable description, if any.
     * 
     * @since 2.3
     */
    public String findPropertyDescription(Annotated ann) { return null; }

    
Method used to check whether specified property member (accessor
or mutator) defines numeric index, and if so, what is the index value.
Possible use cases for index values included use by underlying data format
(some binary formats mandate use of index instead of name) and ordering
of properties (for documentation, or during serialization).
Since:
2.4
Returns:
Explicitly specified index for the property, if any/**
     * Method used to check whether specified property member (accessor
     * or mutator) defines numeric index, and if so, what is the index value.
     * Possible use cases for index values included use by underlying data format
     * (some binary formats mandate use of index instead of name) and ordering
     * of properties (for documentation, or during serialization).
     * 
     * @since 2.4
     * 
     * @return Explicitly specified index for the property, if any
     */
    public Integer findPropertyIndex(Annotated ann) { return null; }

    
Method for finding implicit name for a property that given annotated
member (field, method, creator parameter) may represent.
This is different from explicit, annotation-based property name, in that
it is "weak" and does not either proof that a property exists (for example,
if visibility is not high enough), or override explicit names.
In practice this method is used to introspect optional names for creator
parameters (which may or may not be available and cannot be detected
by standard databind); or to provide alternate name mangling for
fields, getters and/or setters.
Since:
2.4/**
     * Method for finding implicit name for a property that given annotated
     * member (field, method, creator parameter) may represent.
     * This is different from explicit, annotation-based property name, in that
     * it is "weak" and does not either proof that a property exists (for example,
     * if visibility is not high enough), or override explicit names.
     * In practice this method is used to introspect optional names for creator
     * parameters (which may or may not be available and cannot be detected
     * by standard databind); or to provide alternate name mangling for
     * fields, getters and/or setters.
     * 
     * @since 2.4
     */
    public String findImplicitPropertyName(AnnotatedMember member) { return null; }

    
Method called to find if given property has alias(es) defined.
Returns:
`null` if member has no information; otherwise a `List` (possibly
  empty) of aliases to use.
Since:
2.9/**
     * Method called to find if given property has alias(es) defined.
     * 
     * @return `null` if member has no information; otherwise a `List` (possibly
     *   empty) of aliases to use.
     *
     * @since 2.9
     */
    public List<PropertyName> findPropertyAliases(Annotated ann) { return null; }

    
Method for finding optional access definition for a property, annotated
on one of its accessors. If a definition for read-only, write-only
or read-write cases, visibility rules may be modified. Note, however,
that even more specific annotations (like one for ignoring specific accessor)
may further override behavior of the access definition.
Since:
2.6/**
     * Method for finding optional access definition for a property, annotated
     * on one of its accessors. If a definition for read-only, write-only
     * or read-write cases, visibility rules may be modified. Note, however,
     * that even more specific annotations (like one for ignoring specific accessor)
     * may further override behavior of the access definition.
     *
     * @since 2.6
     */
    public JsonProperty.Access findPropertyAccess(Annotated ann) { return null; }

    
Method called in cases where a class has two methods eligible to be used
for the same logical property, and default logic is not enough to figure
out clear precedence. Introspector may try to choose one to use; or, if
unable, return `null` to indicate it cannot resolve the problem.
Since:
2.7/**
     * Method called in cases where a class has two methods eligible to be used
     * for the same logical property, and default logic is not enough to figure
     * out clear precedence. Introspector may try to choose one to use; or, if
     * unable, return `null` to indicate it cannot resolve the problem.
     *
     * @since 2.7
     */
    public AnnotatedMethod resolveSetterConflict(MapperConfig<?> config,
            AnnotatedMethod setter1, AnnotatedMethod setter2) {
        return null;
    }

    
Deprecated:
Since 2.9 Use findInjectableValue instead/**
     * @deprecated Since 2.9 Use {@link #findInjectableValue} instead
     */
    @Deprecated // since 2.9
    public Object findInjectableValueId(AnnotatedMember m) {
        return null;
    }

    /*
    /**********************************************************
    /* Serialization: general annotations
    /**********************************************************
     */

    
Method for getting a serializer definition on specified method or field. Type of definition is either instance (of type JsonSerializer) or Class (of type Class<JsonSerializer>); if value of different
type is returned, a runtime exception may be thrown by caller.
/**
     * Method for getting a serializer definition on specified method
     * or field. Type of definition is either instance (of type
     * {@link JsonSerializer}) or Class (of type
     * <code>Class&lt;JsonSerializer></code>); if value of different
     * type is returned, a runtime exception may be thrown by caller.
     */
    public Object findSerializer(Annotated am) {
        return null;
    }

    
Method for getting a serializer definition for keys of associated Map property. Type of definition is either instance (of type JsonSerializer) or Class (of type Class<JsonSerializer>); if value of different
type is returned, a runtime exception may be thrown by caller.
/**
     * Method for getting a serializer definition for keys of associated <code>Map</code> property.
     * Type of definition is either instance (of type
     * {@link JsonSerializer}) or Class (of type
     * <code>Class&lt;JsonSerializer></code>); if value of different
     * type is returned, a runtime exception may be thrown by caller.
     */
    public Object findKeySerializer(Annotated am) {
        return null;
    }

    
Method for getting a serializer definition for content (values) of
associated Collection, array or Map property. Type of definition is either instance (of type JsonSerializer) or Class (of type Class<JsonSerializer>); if value of different
type is returned, a runtime exception may be thrown by caller.
/**
     * Method for getting a serializer definition for content (values) of
     * associated <code>Collection</code>, <code>array</code> or <code>Map</code> property.
     * Type of definition is either instance (of type
     * {@link JsonSerializer}) or Class (of type
     * <code>Class&lt;JsonSerializer></code>); if value of different
     * type is returned, a runtime exception may be thrown by caller.
     */
    public Object findContentSerializer(Annotated am) {
        return null;
    }

    
Method for getting a serializer definition for serializer to use
for nulls (null values) of associated property or type.
Since:
2.3/**
     * Method for getting a serializer definition for serializer to use
     * for nulls (null values) of associated property or type.
     * 
     * @since 2.3
     */
    public Object findNullSerializer(Annotated am) {
        return null;
    }

    
Method for accessing declared typing mode annotated (if any).
This is used for type detection, unless more granular settings
(such as actual exact type; or serializer to use which means
no type information is needed) take precedence.
Returns:
Typing mode to use, if annotation is found; null otherwise/**
     * Method for accessing declared typing mode annotated (if any).
     * This is used for type detection, unless more granular settings
     * (such as actual exact type; or serializer to use which means
     * no type information is needed) take precedence.
     *
     * @return Typing mode to use, if annotation is found; null otherwise
     */
    public JsonSerialize.Typing findSerializationTyping(Annotated a) {
        return null;
    }

    
Method for finding Converter that annotated entity (property or class) has indicated to be used as part of serialization. If not null, either has to be actual Converter instance, or class for such converter; and resulting converter will be used first to convert property value to converter target type, and then serializer for that type is used for actual serialization. 

This feature is typically used to convert internal values into types
that Jackson can convert.

Note also that this feature does not necessarily work well with polymorphic
type handling, or object identity handling; if such features are needed
an explicit serializer is usually better way to handle serialization.
Params:
a – Annotated property (field, method) or class to check for
  annotations
Since:
2.2/**
     * Method for finding {@link Converter} that annotated entity
     * (property or class) has indicated to be used as part of
     * serialization. If not null, either has to be actual
     * {@link Converter} instance, or class for such converter;
     * and resulting converter will be used first to convert property
     * value to converter target type, and then serializer for that
     * type is used for actual serialization.
     *<p>
     * This feature is typically used to convert internal values into types
     * that Jackson can convert.
     *<p>
     * Note also that this feature does not necessarily work well with polymorphic
     * type handling, or object identity handling; if such features are needed
     * an explicit serializer is usually better way to handle serialization.
     * 
     * @param a Annotated property (field, method) or class to check for
     *   annotations
     *   
     * @since 2.2
     */
    public Object findSerializationConverter(Annotated a) {
        return null;
    }

    
Method for finding Converter that annotated property has indicated needs to be used for values of container type (this also means that method should only be called for properties of container types, List/Map/array properties). 
 If not null, either has to be actual Converter instance, or class for such converter; and resulting converter will be used first to convert property value to converter target type, and then serializer for that type is used for actual serialization. 
 Other notes are same as those for findSerializationConverter 
Params:
a – Annotated property (field, method) to check.
Since:
2.2/**
     * Method for finding {@link Converter} that annotated property
     * has indicated needs to be used for values of container type
     * (this also means that method should only be called for properties
     * of container types, List/Map/array properties).
     *<p>
     * If not null, either has to be actual
     * {@link Converter} instance, or class for such converter;
     * and resulting converter will be used first to convert property
     * value to converter target type, and then serializer for that
     * type is used for actual serialization.
     *<p>
     * Other notes are same as those for {@link #findSerializationConverter}
     * 
     * @param a Annotated property (field, method) to check.
     *   
     * @since 2.2
     */
    public Object findSerializationContentConverter(AnnotatedMember a) {
        return null;
    }

    
Method for checking inclusion criteria for a type (Class) or property (yes, method
name is bit unfortunate -- not just for properties!).
In case of class, acts as the default for properties POJO contains; for properties
acts as override for class defaults and possible global defaults.
Since:
2.6/**
     * Method for checking inclusion criteria for a type (Class) or property (yes, method
     * name is bit unfortunate -- not just for properties!).
     * In case of class, acts as the default for properties POJO contains; for properties
     * acts as override for class defaults and possible global defaults.
     *
     * @since 2.6
     */
    public JsonInclude.Value findPropertyInclusion(Annotated a) {
        return JsonInclude.Value.empty();
    }

    
Method for checking whether given annotated entity (class, method,
field) defines which Bean/Map properties are to be included in
serialization.
If no annotation is found, method should return given second
argument; otherwise value indicated by the annotation.

Note that meaning of inclusion value depends on whether it is for
a Class or property (field/method/constructor): in former case,
it is the default for all properties; in latter case it is specific
override for annotated property.
Returns:
Enumerated value indicating which properties to include
  in serialization
Deprecated:
Since 2.7 Use findPropertyInclusion instead/**
     * Method for checking whether given annotated entity (class, method,
     * field) defines which Bean/Map properties are to be included in
     * serialization.
     * If no annotation is found, method should return given second
     * argument; otherwise value indicated by the annotation.
     *<p>
     * Note that meaning of inclusion value depends on whether it is for
     * a Class or property (field/method/constructor): in former case,
     * it is the default for all properties; in latter case it is specific
     * override for annotated property.
     *
     * @return Enumerated value indicating which properties to include
     *   in serialization
     * 
     * @deprecated Since 2.7 Use {@link #findPropertyInclusion} instead
     */
    @Deprecated // since 2.7
    public JsonInclude.Include findSerializationInclusion(Annotated a, JsonInclude.Include defValue) {
        return defValue;
    }

    
Method for checking whether content (entries) of a Map property are to be included during serialization or not. NOTE: this is NOT called for POJO properties, or array/Collection elements. 
Since:
2.5
Deprecated:
Since 2.7 Use findPropertyInclusion instead/**
     * Method for checking whether content (entries) of a {@link java.util.Map} property
     * are to be included during serialization or not.
     * NOTE: this is NOT called for POJO properties, or array/Collection elements.
     *
     * @since 2.5
     *
     * @deprecated Since 2.7 Use {@link #findPropertyInclusion} instead
     */
    @Deprecated // since 2.7
    public JsonInclude.Include findSerializationInclusionForContent(Annotated a, JsonInclude.Include defValue) {
        return defValue;
    }

    /*
    /**********************************************************
    /* Serialization: type refinements
    /**********************************************************
     */

    
Method called to find out possible type refinements to use
for deserialization, including not just value itself but
key and/or content type, if type has those.
Since:
2.7/**
     * Method called to find out possible type refinements to use
     * for deserialization, including not just value itself but
     * key and/or content type, if type has those.
     *
     * @since 2.7
     */
    public JavaType refineSerializationType(final MapperConfig<?> config,
            final Annotated a, final JavaType baseType) throws JsonMappingException
    {
        return baseType;
    }

    
Deprecated:
Since 2.7 call refineSerializationType instead/**
     * @deprecated Since 2.7 call {@link #refineSerializationType} instead
     */
    @Deprecated // since 2.7
    public Class<?> findSerializationType(Annotated a) {
        return null;
    }

    
Deprecated:
Since 2.7 call refineSerializationType instead/**
     * @deprecated Since 2.7 call {@link #refineSerializationType} instead
     */
    @Deprecated // since 2.7
    public Class<?> findSerializationKeyType(Annotated am, JavaType baseType) {
        return null;
    }

    
Deprecated:
Since 2.7 call refineSerializationType instead/**
     * @deprecated Since 2.7 call {@link #refineSerializationType} instead
     */
    @Deprecated // since 2.7
    public Class<?> findSerializationContentType(Annotated am, JavaType baseType) {
        return null;
    }
    
    /*
    /**********************************************************
    /* Serialization: class annotations
    /**********************************************************
     */

    
Method for accessing defined property serialization order (which may be
partial). May return null if no ordering is defined.
/**
     * Method for accessing defined property serialization order (which may be
     * partial). May return null if no ordering is defined.
     */
    public String[] findSerializationPropertyOrder(AnnotatedClass ac) {
        return null;
    }

    
Method for checking whether an annotation indicates that serialized properties
for which no explicit is defined should be alphabetically (lexicograpically)
ordered
/**
     * Method for checking whether an annotation indicates that serialized properties
     * for which no explicit is defined should be alphabetically (lexicograpically)
     * ordered
     */
    public Boolean findSerializationSortAlphabetically(Annotated ann) {
        return null;
    }

    
Method for adding possible virtual properties to be serialized along
with regular properties.
Since:
2.5/**
     * Method for adding possible virtual properties to be serialized along
     * with regular properties.
     * 
     * @since 2.5
     */
    public void findAndAddVirtualProperties(MapperConfig<?> config, AnnotatedClass ac,
            List<BeanPropertyWriter> properties) { }
    
    /*
    /**********************************************************
    /* Serialization: property annotations
    /**********************************************************
     */

    
Method for checking whether given property accessors (method, field) has an annotation that suggests property name to use for serialization. Should return null if no annotation is found; otherwise a non-null name (possibly PropertyName.USE_DEFAULT, which means "use default heuristics"). 
Params:
a – Property accessor to check
Returns:
Name to use if found; null if not.
Since:
2.1/**
     * Method for checking whether given property accessors (method,
     * field) has an annotation that suggests property name to use
     * for serialization.
     * Should return null if no annotation
     * is found; otherwise a non-null name (possibly
     * {@link PropertyName#USE_DEFAULT}, which means "use default heuristics").
     * 
     * @param a Property accessor to check
     * 
     * @return Name to use if found; null if not.
     * 
     * @since 2.1
     */
    public PropertyName findNameForSerialization(Annotated a) {
        return null;
    }

    
Method for checking whether given method has an annotation
that suggests that the return value of annotated method
should be used as "the value" of the object instance; usually
serialized as a primitive value such as String or number.
Returns:
Boolean.TRUE if such annotation is found and is not disabled; Boolean.FALSE if disabled annotation (block) is found (to indicate accessor is definitely NOT to be used "as value"); or `null` if no information found.
Since:
2.9/**
     * Method for checking whether given method has an annotation
     * that suggests that the return value of annotated method
     * should be used as "the value" of the object instance; usually
     * serialized as a primitive value such as String or number.
     *
     * @return {@link Boolean#TRUE} if such annotation is found and is not disabled;
     *   {@link Boolean#FALSE} if disabled annotation (block) is found (to indicate
     *   accessor is definitely NOT to be used "as value"); or `null` if no
     *   information found.
     *   
     * @since 2.9
     */
    public Boolean hasAsValue(Annotated a) {
        // 20-Nov-2016, tatu: Delegate in 2.9; remove redirect from later versions
        if (a instanceof AnnotatedMethod) {
            if (hasAsValueAnnotation((AnnotatedMethod) a)) {
                return true;
            }
        }
        return null;
    }

    
Method for checking whether given method has an annotation
that suggests that the method is to serve as "any setter";
method to be used for accessing set of miscellaneous "extra"
properties, often bound with matching "any setter" method.
Returns:
True if such annotation is found (and is not disabled),
  false otherwise
Since:
2.9/**
     * Method for checking whether given method has an annotation
     * that suggests that the method is to serve as "any setter";
     * method to be used for accessing set of miscellaneous "extra"
     * properties, often bound with matching "any setter" method.
     *
     * @return True if such annotation is found (and is not disabled),
     *   false otherwise
     *
     * @since 2.9
     */
    public Boolean hasAnyGetter(Annotated a) {

        // 21-Nov-2016, tatu: Delegate in 2.9; remove redirect from later versions
        if (a instanceof AnnotatedMethod) {
            if (hasAnyGetterAnnotation((AnnotatedMethod) a)) {
                return true;
            }
        }
        return null;
    }

    
Method for efficiently figuring out which if given set of Enum values
have explicitly defined name. Method will overwrite entries in incoming names
array with explicit names found, if any, leaving other entries unmodified.
 Default implementation will simply delegate to findEnumValue, which is close enough, although unfortunately NOT 100% equivalent (as it will also consider name()
to give explicit value).
Since:
2.7/**
     * Method for efficiently figuring out which if given set of <code>Enum</code> values
     * have explicitly defined name. Method will overwrite entries in incoming <code>names</code>
     * array with explicit names found, if any, leaving other entries unmodified.
     *<p>
     * Default implementation will simply delegate to {@link #findEnumValue}, which is close
     * enough, although unfortunately NOT 100% equivalent (as it will also consider <code>name()</code>
     * to give explicit value).
     *
     * @since 2.7
     */
    public String[] findEnumValues(Class<?> enumType, Enum<?>[] enumValues, String[] names) {
        // 18-Oct-2016, tatu: In 2.8 delegated to deprecated method; not so in 2.9 and beyond
        return names;
    }

    
Finds the Enum value that should be considered the default value, if possible.
Params:
enumCls – The Enum class to scan for the default value.
Returns:
null if none found or it's not possible to determine one.
Since:
2.8/**
     * Finds the Enum value that should be considered the default value, if possible.
     *
     * @param enumCls The Enum class to scan for the default value.
     * @return null if none found or it's not possible to determine one.
     *
     * @since 2.8
     */
    public Enum<?> findDefaultEnumValue(Class<Enum<?>> enumCls) {
        return null;
    }

    
Method for determining the String value to use for serializing
given enumeration entry; used when serializing enumerations
as Strings (the standard method).
Returns:
Serialized enum value.
Deprecated:
Since 2.8: use findEnumValues instead because this method does not properly handle override settings (defaults to enum.name
   without indicating whether that is explicit or not), and is inefficient to
   call one-by-one./**
     * Method for determining the String value to use for serializing
     * given enumeration entry; used when serializing enumerations
     * as Strings (the standard method).
     *
     * @return Serialized enum value.
     *
     * @deprecated Since 2.8: use {@link #findEnumValues} instead because this method
     *    does not properly handle override settings (defaults to <code>enum.name</code>
     *    without indicating whether that is explicit or not), and is inefficient to
     *    call one-by-one.
     */
    @Deprecated
    public String findEnumValue(Enum<?> value) {
        return value.name();
    }

    
Deprecated:
Since 2.9 Use hasAsValue(Annotated) instead./**
     * @deprecated Since 2.9 Use {@link #hasAsValue(Annotated)} instead.
     */
    @Deprecated // since 2.9
    public boolean hasAsValueAnnotation(AnnotatedMethod am) {
        return false;
    }

    
Deprecated:
Since 2.9 Use hasAnyGetter instead/**
     * @deprecated Since 2.9 Use {@link #hasAnyGetter} instead
     */
    @Deprecated
    public boolean hasAnyGetterAnnotation(AnnotatedMethod am) {
        return false;
    }
    
    /*
    /**********************************************************
    /* Deserialization: general annotations
    /**********************************************************
     */

    
Method for getting a deserializer definition on specified method or field. Type of definition is either instance (of type JsonDeserializer) or Class (of type Class<JsonDeserializer>); if value of different
type is returned, a runtime exception may be thrown by caller.
/**
     * Method for getting a deserializer definition on specified method
     * or field.
     * Type of definition is either instance (of type
     * {@link JsonDeserializer}) or Class (of type
     * <code>Class&lt;JsonDeserializer></code>); if value of different
     * type is returned, a runtime exception may be thrown by caller.
     */
    public Object findDeserializer(Annotated am) {
        return null;
    }

    
Method for getting a deserializer definition for keys of
associated Map property. Type of definition is either instance (of type JsonDeserializer) or Class (of type Class<JsonDeserializer>); if value of different
type is returned, a runtime exception may be thrown by caller.
/**
     * Method for getting a deserializer definition for keys of
     * associated <code>Map</code> property.
     * Type of definition is either instance (of type
     * {@link JsonDeserializer}) or Class (of type
     * <code>Class&lt;JsonDeserializer></code>); if value of different
     * type is returned, a runtime exception may be thrown by caller.
     */
    public Object findKeyDeserializer(Annotated am) {
        return null;
    }

    
Method for getting a deserializer definition for content (values) of
associated Collection, array or
Map property. Type of definition is either instance (of type JsonDeserializer) or Class (of type Class<JsonDeserializer>); if value of different
type is returned, a runtime exception may be thrown by caller.
/**
     * Method for getting a deserializer definition for content (values) of
     * associated <code>Collection</code>, <code>array</code> or
     * <code>Map</code> property.
     * Type of definition is either instance (of type
     * {@link JsonDeserializer}) or Class (of type
     * <code>Class&lt;JsonDeserializer></code>); if value of different
     * type is returned, a runtime exception may be thrown by caller.
     */
    public Object findContentDeserializer(Annotated am) {
        return null;
    }

    
Method for finding Converter that annotated entity (property or class) has indicated to be used as part of deserialization. If not null, either has to be actual Converter instance, or class for such converter; and resulting converter will be used after Jackson has deserializer data into intermediate type (Converter input type), and Converter needs to convert this into its target type to be set as property value. 

This feature is typically used to convert intermediate Jackson types
(that default deserializers can produce) into custom type instances.

Note also that this feature does not necessarily work well with polymorphic
type handling, or object identity handling; if such features are needed
an explicit deserializer is usually better way to handle deserialization.
Params:
a – Annotated property (field, method) or class to check for
  annotations
Since:
2.2/**
     * Method for finding {@link Converter} that annotated entity
     * (property or class) has indicated to be used as part of
     * deserialization.
     * If not null, either has to be actual
     * {@link Converter} instance, or class for such converter;
     * and resulting converter will be used after Jackson has deserializer
     * data into intermediate type (Converter input type), and Converter
     * needs to convert this into its target type to be set as property value.
     *<p>
     * This feature is typically used to convert intermediate Jackson types
     * (that default deserializers can produce) into custom type instances.
     *<p>
     * Note also that this feature does not necessarily work well with polymorphic
     * type handling, or object identity handling; if such features are needed
     * an explicit deserializer is usually better way to handle deserialization.
     * 
     * @param a Annotated property (field, method) or class to check for
     *   annotations
     *   
     * @since 2.2
     */
    public Object findDeserializationConverter(Annotated a) {
        return null;
    }

    
Method for finding Converter that annotated property has indicated needs to be used for values of container type (this also means that method should only be called for properties of container types, List/Map/array properties). 
 If not null, either has to be actual Converter instance, or class for such converter; and resulting converter will be used after Jackson has deserializer data into intermediate type (Converter input type), and Converter needs to convert this into its target type to be set as property value. 
 Other notes are same as those for findDeserializationConverter 
Params:
a – Annotated property (field, method) to check.
Since:
2.2/**
     * Method for finding {@link Converter} that annotated property
     * has indicated needs to be used for values of container type
     * (this also means that method should only be called for properties
     * of container types, List/Map/array properties).
     *<p>
     * If not null, either has to be actual
     * {@link Converter} instance, or class for such converter;
     * and resulting converter will be used after Jackson has deserializer
     * data into intermediate type (Converter input type), and Converter
     * needs to convert this into its target type to be set as property value.
     *<p>
     * Other notes are same as those for {@link #findDeserializationConverter}
     * 
     * @param a Annotated property (field, method) to check.
     *   
     * @since 2.2
     */
    public Object findDeserializationContentConverter(AnnotatedMember a) {
        return null;
    }

    /*
    /**********************************************************
    /* Deserialization: type refinements
    /**********************************************************
     */

    
Method called to find out possible type refinements to use
for deserialization.
Since:
2.7/**
     * Method called to find out possible type refinements to use
     * for deserialization.
     *
     * @since 2.7
     */
    public JavaType refineDeserializationType(final MapperConfig<?> config,
            final Annotated a, final JavaType baseType) throws JsonMappingException
    {
        return baseType;
    }

    
Method for accessing annotated type definition that a
property can have, to be used as the type for deserialization
instead of the static (declared) type.
Type is usually narrowing conversion (i.e.subtype of declared type).
Declared return type of the method is also considered acceptable.
Params:
baseType – Assumed type before considering annotations
Returns:
Class to use for deserialization instead of declared type
Deprecated:
Since 2.7 call refineDeserializationType instead/**
     * Method for accessing annotated type definition that a
     * property can have, to be used as the type for deserialization
     * instead of the static (declared) type.
     * Type is usually narrowing conversion (i.e.subtype of declared type).
     * Declared return type of the method is also considered acceptable.
     *
     * @param baseType Assumed type before considering annotations
     *
     * @return Class to use for deserialization instead of declared type
     *
     * @deprecated Since 2.7 call {@link #refineDeserializationType} instead
     */
    @Deprecated
    public Class<?> findDeserializationType(Annotated am, JavaType baseType) {
        return null;
    }
    
    
Method for accessing additional narrowing type definition that a method can have, to define more specific key type to use. It should be only be used with Map types. 
Params:
baseKeyType – Assumed key type before considering annotations
Returns:
Class specifying more specific type to use instead of
  declared type, if annotation found; null if not
Deprecated:
Since 2.7 call refineDeserializationType instead/**
     * Method for accessing additional narrowing type definition that a
     * method can have, to define more specific key type to use.
     * It should be only be used with {@link java.util.Map} types.
     * 
     * @param baseKeyType Assumed key type before considering annotations
     *
     * @return Class specifying more specific type to use instead of
     *   declared type, if annotation found; null if not
     *
     * @deprecated Since 2.7 call {@link #refineDeserializationType} instead
     */
    @Deprecated
    public Class<?> findDeserializationKeyType(Annotated am, JavaType baseKeyType) {
        return null;
    }

    
Method for accessing additional narrowing type definition that a
method can have, to define more specific content type to use;
content refers to Map values and Collection/array elements.
It should be only be used with Map, Collection and array types.
Params:
baseContentType – Assumed content (value) type before considering annotations
Returns:
Class specifying more specific type to use instead of
  declared type, if annotation found; null if not
Deprecated:
Since 2.7 call refineDeserializationType instead/**
     * Method for accessing additional narrowing type definition that a
     * method can have, to define more specific content type to use;
     * content refers to Map values and Collection/array elements.
     * It should be only be used with Map, Collection and array types.
     * 
     * @param baseContentType Assumed content (value) type before considering annotations
     *
     * @return Class specifying more specific type to use instead of
     *   declared type, if annotation found; null if not
     *
     * @deprecated Since 2.7 call {@link #refineDeserializationType} instead
     */
    @Deprecated
    public Class<?> findDeserializationContentType(Annotated am, JavaType baseContentType) {
        return null;
    }

    /*
    /**********************************************************
    /* Deserialization: class annotations
    /**********************************************************
     */

    
Method getting ValueInstantiator to use for given type (class): return value can either be an instance of instantiator, or class of instantiator to create. /**
     * Method getting {@link ValueInstantiator} to use for given
     * type (class): return value can either be an instance of
     * instantiator, or class of instantiator to create.
     */
    public Object findValueInstantiator(AnnotatedClass ac) {
        return null;
    }

    
Method for finding Builder object to use for constructing
value instance and binding data (sort of combining value
instantiators that can construct, and deserializers
that can bind data).

Note that unlike accessors for some helper Objects, this
method does not allow returning instances: the reason is
that builders have state, and a separate instance needs
to be created for each deserialization call.
Since:
2.0/**
     * Method for finding Builder object to use for constructing
     * value instance and binding data (sort of combining value
     * instantiators that can construct, and deserializers
     * that can bind data).
     *<p>
     * Note that unlike accessors for some helper Objects, this
     * method does not allow returning instances: the reason is
     * that builders have state, and a separate instance needs
     * to be created for each deserialization call.
     * 
     * @since 2.0
     */
    public Class<?> findPOJOBuilder(AnnotatedClass ac) {
        return null;
    }

    
Since:
2.0/**
     * @since 2.0
     */
    public JsonPOJOBuilder.Value findPOJOBuilderConfig(AnnotatedClass ac) {
        return null;
    }

    /*
    /**********************************************************
    /* Deserialization: property annotations
    /**********************************************************
     */

    
Method for checking whether given property accessors (method, field) has an annotation that suggests property name to use for deserialization (reading JSON into POJOs). Should return null if no annotation is found; otherwise a non-null name (possibly PropertyName.USE_DEFAULT, which means "use default heuristics"). 
Params:
a – Property accessor to check
Returns:
Name to use if found; null if not.
Since:
2.1/**
     * Method for checking whether given property accessors (method,
     * field) has an annotation that suggests property name to use
     * for deserialization (reading JSON into POJOs).
     * Should return null if no annotation
     * is found; otherwise a non-null name (possibly
     * {@link PropertyName#USE_DEFAULT}, which means "use default heuristics").
     * 
     * @param a Property accessor to check
     * 
     * @return Name to use if found; null if not.
     * 
     * @since 2.1
     */
    public PropertyName findNameForDeserialization(Annotated a) {
        return null;
    }
    
    
Method for checking whether given method has an annotation
that suggests that the method is to serve as "any setter";
method to be used for setting values of any properties for
which no dedicated setter method is found.
Returns:
True if such annotation is found (and is not disabled),
  false otherwise
Since:
2.9/**
     * Method for checking whether given method has an annotation
     * that suggests that the method is to serve as "any setter";
     * method to be used for setting values of any properties for
     * which no dedicated setter method is found.
     *
     * @return True if such annotation is found (and is not disabled),
     *   false otherwise
     *   
     * @since 2.9
     */
    public Boolean hasAnySetter(Annotated a) {
        return null;
    }

    
Method for finding possible settings for property, given annotations
on an accessor.
Since:
2.9/**
     * Method for finding possible settings for property, given annotations
     * on an accessor.
     *
     * @since 2.9
     */
    public JsonSetter.Value findSetterInfo(Annotated a) {
        return JsonSetter.Value.empty();
    }

    
Method for finding merge settings for property, if any.
Since:
2.9/**
     * Method for finding merge settings for property, if any.
     *
     * @since 2.9
     */
    public Boolean findMergeInfo(Annotated a) {
        return null;
    }

    
Method called to check whether potential Creator (constructor or static factory method) has explicit annotation to indicate it as actual Creator; and if so, which Mode to use. 
 NOTE: caller needs to consider possibility of both `null` (no annotation found) and Mode.DISABLED (annotation found, but disabled); latter is necessary as marker in case multiple introspectors are chained, as well as possibly as when using mix-in annotations. 
Params:
config – Configuration settings in effect (for serialization or deserialization)
a – Annotated accessor (usually constructor or static method) to check
Since:
2.9/**
     * Method called to check whether potential Creator (constructor or static factory
     * method) has explicit annotation to indicate it as actual Creator; and if so,
     * which {@link com.fasterxml.jackson.annotation.JsonCreator.Mode} to use.
     *<p>
     * NOTE: caller needs to consider possibility of both `null` (no annotation found)
     * and {@link com.fasterxml.jackson.annotation.JsonCreator.Mode#DISABLED} (annotation found,
     * but disabled); latter is necessary as marker in case multiple introspectors are chained,
     * as well as possibly as when using mix-in annotations.
     *
     * @param config Configuration settings in effect (for serialization or deserialization)
     * @param a Annotated accessor (usually constructor or static method) to check
     *
     * @since 2.9
     */
    public JsonCreator.Mode findCreatorAnnotation(MapperConfig<?> config, Annotated a) {
        // 13-Sep-2016, tatu: for backwards compatibility, implement using delegation
        ///   (remove from version AFTER 2.9)
        if (hasCreatorAnnotation(a)) {
            JsonCreator.Mode mode = findCreatorBinding(a);
            if (mode == null) {
                mode = JsonCreator.Mode.DEFAULT;
            }
            return mode;
        }
        return null;
    }

    
Method for checking whether given annotated item (method, constructor)
has an annotation
that suggests that the method is a "creator" (aka factory)
method to be used for construct new instances of deserialized
values.
Returns:
True if such annotation is found (and is not disabled),
  false otherwise
Deprecated:
Since 2.9 use findCreatorAnnotation instead./**
     * Method for checking whether given annotated item (method, constructor)
     * has an annotation
     * that suggests that the method is a "creator" (aka factory)
     * method to be used for construct new instances of deserialized
     * values.
     *
     * @return True if such annotation is found (and is not disabled),
     *   false otherwise
     *
     * @deprecated Since 2.9 use {@link #findCreatorAnnotation} instead.
     */
    @Deprecated
    public boolean hasCreatorAnnotation(Annotated a) {
        return false;
    }

    
Method for finding indication of creator binding mode for a creator (something for which hasCreatorAnnotation returns true), for cases where there may be ambiguity (currently: single-argument creator with implicit but no explicit name for the argument). 
Since:
2.5
Deprecated:
Since 2.9 use findCreatorAnnotation instead./**
     * Method for finding indication of creator binding mode for
     * a creator (something for which {@link #hasCreatorAnnotation} returns
     * true), for cases where there may be ambiguity (currently: single-argument
     * creator with implicit but no explicit name for the argument).
     * 
     * @since 2.5
     * @deprecated Since 2.9 use {@link #findCreatorAnnotation} instead.
     */
    @Deprecated
    public JsonCreator.Mode findCreatorBinding(Annotated a) {
        return null;
    }

    
Deprecated:
Since 2.9 use hasAnySetter instead./**
     * @deprecated Since 2.9 use {@link #hasAnySetter} instead.
     */
    @Deprecated // since 2.9
    public boolean hasAnySetterAnnotation(AnnotatedMethod am) {
        return false;
    }

    /*
    /**********************************************************
    /* Overridable methods: may be used as low-level extension
    /* points.
    /**********************************************************
     */

    
Method that should be used by sub-classes for ALL
annotation access;
overridable so 
that sub-classes may, if they choose to, mangle actual access to
block access ("hide" annotations) or perhaps change it.

Default implementation is simply:

 return annotated.getAnnotation(annoClass);

Since:
2.5/**
     * Method that should be used by sub-classes for ALL
     * annotation access;
     * overridable so 
     * that sub-classes may, if they choose to, mangle actual access to
     * block access ("hide" annotations) or perhaps change it.
     *<p>
     * Default implementation is simply:
     *<code>
     *  return annotated.getAnnotation(annoClass);
     *</code>
     * 
     * @since 2.5
     */
    protected <A extends Annotation> A _findAnnotation(Annotated annotated,
            Class<A> annoClass) {
        return annotated.getAnnotation(annoClass);
    }

    
Method that should be used by sub-classes for ALL
annotation existence access;
overridable so  that sub-classes may, if they choose to, mangle actual access to
block access ("hide" annotations) or perhaps change value seen.

Default implementation is simply:

 return annotated.hasAnnotation(annoClass);

Since:
2.5/**
     * Method that should be used by sub-classes for ALL
     * annotation existence access;
     * overridable so  that sub-classes may, if they choose to, mangle actual access to
     * block access ("hide" annotations) or perhaps change value seen.
     *<p>
     * Default implementation is simply:
     *<code>
     *  return annotated.hasAnnotation(annoClass);
     *</code>
     * 
     * @since 2.5
     */
    protected boolean _hasAnnotation(Annotated annotated, Class<? extends Annotation> annoClass) {
        return annotated.hasAnnotation(annoClass);
    }

    
Alternative lookup method that is used to see if annotation has at least one of
annotations of types listed in second argument.
Since:
2.7/**
     * Alternative lookup method that is used to see if annotation has at least one of
     * annotations of types listed in second argument.
     *
     * @since 2.7
     */
    protected boolean _hasOneOf(Annotated annotated, Class<? extends Annotation>[] annoClasses) {
        return annotated.hasOneOf(annoClasses);
    }
}