package com.fasterxml.jackson.dataformat.xml;

import java.io.IOException;

import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.dataformat.xml.deser.FromXmlParser;
import com.fasterxml.jackson.dataformat.xml.ser.ToXmlGenerator;
import com.fasterxml.jackson.dataformat.xml.ser.XmlSerializerProvider;
import com.fasterxml.jackson.dataformat.xml.util.DefaultXmlPrettyPrinter;
import com.fasterxml.jackson.dataformat.xml.util.XmlRootNameLookup;

Customized ObjectMapper that will read and write XML instead of JSON, using XML-backed JsonFactory implementation (XmlFactory). 

Mapper itself overrides some aspects of functionality to try to handle
data binding aspects as similar to JAXB as possible.
 Note that most of configuration should be done by pre-constructing JacksonXmlModule explicitly, instead of relying on default settings. /**
 * Customized {@link ObjectMapper} that will read and write XML instead of JSON,
 * using XML-backed {@link com.fasterxml.jackson.core.JsonFactory}
 * implementation ({@link XmlFactory}).
 *<p>
 * Mapper itself overrides some aspects of functionality to try to handle
 * data binding aspects as similar to JAXB as possible.
 *<p>
 * Note that most of configuration should be done by pre-constructing
 * {@link JacksonXmlModule} explicitly, instead of relying on default settings.
 */
public class XmlMapper extends ObjectMapper
{
    // as of 2.6
    private static final long serialVersionUID = 1L;

    protected final static JacksonXmlModule DEFAULT_XML_MODULE = new JacksonXmlModule();

    protected final static DefaultXmlPrettyPrinter DEFAULT_XML_PRETTY_PRINTER = new DefaultXmlPrettyPrinter();

    // need to hold on to module instance just in case copy() is used
    protected final JacksonXmlModule _xmlModule;

    /*
    /**********************************************************
    /* Life-cycle: construction, configuration
    /**********************************************************
     */

    public XmlMapper() {
        this(new XmlFactory());
    }

    
Since:
2.4/**
     * @since 2.4
     */
    public XmlMapper(XMLInputFactory inputF, XMLOutputFactory outF) {
        this(new XmlFactory(inputF, outF));
    }

    
Since:
2.4/**
     * @since 2.4
     */
    public XmlMapper(XMLInputFactory inputF) {
        this(new XmlFactory(inputF));
    }

    public XmlMapper(XmlFactory xmlFactory) {
        this(xmlFactory, DEFAULT_XML_MODULE);
    }

    public XmlMapper(JacksonXmlModule module) {
        this(new XmlFactory(), module);
    }

    public XmlMapper(XmlFactory xmlFactory, JacksonXmlModule module)
    {
        /* Need to override serializer provider (due to root name handling);
         * deserializer provider fine as is
         */
        super(xmlFactory, new XmlSerializerProvider(new XmlRootNameLookup()), null);
        _xmlModule = module;
        // but all the rest is done via Module interface!
        if (module != null) {
            registerModule(module);
        }
        // 19-May-2015, tatu: Must ensure we use XML-specific indenter
        _serializationConfig = _serializationConfig.withDefaultPrettyPrinter(DEFAULT_XML_PRETTY_PRINTER);
        // 21-Jun-2017, tatu: Seems like there are many cases in XML where ability to coerce empty
        //    String into `null` (where it otherwise is an error) is very useful.
        enable(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);
    }

    
Since:
2.8.9/**
     * @since 2.8.9
     */
    protected XmlMapper(XmlMapper src) {
        super(src);
        _xmlModule = src._xmlModule;
    }

    @Override
    public XmlMapper copy()
    {
        _checkInvalidCopy(XmlMapper.class);
        return new XmlMapper(this);
    }

    @Override
    public Version version() {
        return PackageVersion.VERSION;
    }

    /*
    /**********************************************************
    /* Additional XML-specific configurations
    /**********************************************************
     */

    
Method called by JacksonXmlModule to pass configuration information to XmlFactory, during registration; NOT exposed as public method since configuration should be done via JacksonXmlModule. 
Since:
2.1/**
     * Method called by {@link JacksonXmlModule} to pass configuration
     * information to {@link XmlFactory}, during registration; NOT
     * exposed as public method since configuration should be done
     * via {@link JacksonXmlModule}.
     * 
     * @since 2.1
     */
    protected void setXMLTextElementName(String name) {
        ((XmlFactory) _jsonFactory).setXMLTextElementName(name);
    }

    
Since 2.7
/**
     * Since 2.7
     */
    public XmlMapper setDefaultUseWrapper(boolean state) {
        // ser and deser configs should usually have the same introspector, so:
        AnnotationIntrospector ai0 = getDeserializationConfig().getAnnotationIntrospector();
        for (AnnotationIntrospector ai : ai0.allIntrospectors()) {
            if (ai instanceof XmlAnnotationIntrospector) {
                ((XmlAnnotationIntrospector) ai).setDefaultUseWrapper(state);
            }
        }
        return this;
    }

    /*
    /**********************************************************
    /* Access to configuration settings
    /**********************************************************
     */

    @Override
    public XmlFactory getFactory() {
        return (XmlFactory) _jsonFactory;
    }
    
    public ObjectMapper configure(ToXmlGenerator.Feature f, boolean state) {
        ((XmlFactory)_jsonFactory).configure(f, state);
        return this;
    }

    public ObjectMapper configure(FromXmlParser.Feature f, boolean state) {
        ((XmlFactory)_jsonFactory).configure(f, state);
        return this;
    }

    public ObjectMapper enable(ToXmlGenerator.Feature f) {
        ((XmlFactory)_jsonFactory).enable(f);
        return this;
    }

    public ObjectMapper enable(FromXmlParser.Feature f) {
        ((XmlFactory)_jsonFactory).enable(f);
        return this;
    }

    public ObjectMapper disable(ToXmlGenerator.Feature f) {
        ((XmlFactory)_jsonFactory).disable(f);
        return this;
    }

    public ObjectMapper disable(FromXmlParser.Feature f) {
        ((XmlFactory)_jsonFactory).disable(f);
        return this;
    }

    /*
    /**********************************************************
    /* XML-specific access
    /**********************************************************
     */

    
Method for reading a single XML value from given XML-specific input source; useful for incremental data-binding, combining traversal using basic Stax XMLStreamReader with data-binding by Jackson. 
Since:
2.4/**
     * Method for reading a single XML value from given XML-specific input
     * source; useful for incremental data-binding, combining traversal using
     * basic Stax {@link XMLStreamReader} with data-binding by Jackson.
     * 
     * @since 2.4
     */
    public <T> T readValue(XMLStreamReader r, Class<T> valueType) throws IOException {
        return readValue(r, _typeFactory.constructType(valueType));
    } 

    
Method for reading a single XML value from given XML-specific input source; useful for incremental data-binding, combining traversal using basic Stax XMLStreamReader with data-binding by Jackson. 
Since:
2.4/**
     * Method for reading a single XML value from given XML-specific input
     * source; useful for incremental data-binding, combining traversal using
     * basic Stax {@link XMLStreamReader} with data-binding by Jackson.
     * 
     * @since 2.4
     */
    public <T> T readValue(XMLStreamReader r, TypeReference<T> valueTypeRef) throws IOException {
        return readValue(r, _typeFactory.constructType(valueTypeRef));
    } 

    
Method for reading a single XML value from given XML-specific input source; useful for incremental data-binding, combining traversal using basic Stax XMLStreamReader with data-binding by Jackson. 
Since:
2.4/**
     * Method for reading a single XML value from given XML-specific input
     * source; useful for incremental data-binding, combining traversal using
     * basic Stax {@link XMLStreamReader} with data-binding by Jackson.
     * 
     * @since 2.4
     */
    @SuppressWarnings("resource")
    public <T> T readValue(XMLStreamReader r, JavaType valueType) throws IOException
    {
        FromXmlParser p = getFactory().createParser(r);
        return super.readValue(p,  valueType);
    } 

    
Method for serializing given value using specific XMLStreamReader: useful when building large XML files by binding individual items, one at a time. 
Since:
2.4/**
     * Method for serializing given value using specific {@link XMLStreamReader}:
     * useful when building large XML files by binding individual items, one at
     * a time.
     * 
     * @since 2.4
     */
    public void writeValue(XMLStreamWriter w0, Object value) throws IOException {
        @SuppressWarnings("resource")
        ToXmlGenerator g = getFactory().createGenerator(w0);
        super.writeValue(g, value);
        /* NOTE: above call should do flush(); and we should NOT close here.
         * Finally, 'g' has no buffers to release.
         */
    }
    
    /*
    /**********************************************************
    /* Overridden methods
    /**********************************************************
     */

    // 09-May-2016, tatu: Was removed from `jackson-databind` in 2.8; remove from
    //    here in 2.9.
    @Deprecated // since 2.6
//    @Override
    protected PrettyPrinter _defaultPrettyPrinter() {
        return new DefaultXmlPrettyPrinter();
    }
}