java/11 : java.management/javax/management/openmbean/OpenMBeanParameterInfoSupport.java

OpenMBeanParameterInfoSupport
https://openjdk.java.net/
GPLv2 + Classpath Exception
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package javax.management.openmbean;


// java import
//
import java.util.Set;
import javax.management.Descriptor;
import javax.management.DescriptorRead;  // for Javadoc
import javax.management.ImmutableDescriptor;
import javax.management.MBeanParameterInfo;

// OpenMBeanAttributeInfoSupport and this class are very similar
// but can't easily be refactored because there's no multiple inheritance.
// The best we can do for refactoring is to put a bunch of static methods
// in OpenMBeanAttributeInfoSupport and import them here.
import static javax.management.openmbean.OpenMBeanAttributeInfoSupport.*;

Describes a parameter used in one or more operations or
constructors of an open MBean.
Since: 1.5/**
 * Describes a parameter used in one or more operations or
 * constructors of an open MBean.
 *
 *
 * @since 1.5
 */
public class OpenMBeanParameterInfoSupport
    extends MBeanParameterInfo
    implements OpenMBeanParameterInfo {

    /* Serial version */
    static final long serialVersionUID = -7235016873758443122L;

    @serial The open mbean parameter's open type/**
     * @serial The open mbean parameter's <i>open type</i>
     */
    private OpenType<?>    openType;

    @serial The open mbean parameter's default value/**
     * @serial The open mbean parameter's default value
     */
    private Object      defaultValue    = null;

    @serial The open mbean parameter's legal values. This Set is unmodifiable/**
     * @serial The open mbean parameter's legal values. This {@link
     * Set} is unmodifiable
     */
    private Set<?> legalValues     = null;  // to be constructed unmodifiable

    @serial The open mbean parameter's min value/**
     * @serial The open mbean parameter's min value
     */
    private Comparable<?> minValue        = null;

    @serial The open mbean parameter's max value/**
     * @serial The open mbean parameter's max value
     */
    private Comparable<?> maxValue        = null;


    // As this instance is immutable, these two values need only
    // be calculated once.
    private transient Integer myHashCode = null;        // As this instance is immutable, these two values
    private transient String  myToString = null;        // need only be calculated once.


    Constructs an OpenMBeanParameterInfoSupport instance, which describes the parameter used in one or more operations or constructors of a class of open MBeans, with the specified name, openType and description. 
Params: name –  cannot be a null or empty string.
description –  cannot be a null or empty string.
openType –  cannot be null.
Throws: IllegalArgumentException – if name or 
description are null or empty string, or openType is null./**
     * Constructs an {@code OpenMBeanParameterInfoSupport} instance,
     * which describes the parameter used in one or more operations or
     * constructors of a class of open MBeans, with the specified
     * {@code name}, {@code openType} and {@code description}.
     *
     * @param name  cannot be a null or empty string.
     *
     * @param description  cannot be a null or empty string.
     *
     * @param openType  cannot be null.
     *
     * @throws IllegalArgumentException if {@code name} or {@code
     * description} are null or empty string, or {@code openType} is
     * null.
     */
    public OpenMBeanParameterInfoSupport(String name,
                                         String description,
                                         OpenType<?> openType) {
        this(name, description, openType, (Descriptor) null);
    }

    Constructs an OpenMBeanParameterInfoSupport instance, which describes the parameter used in one or more operations or constructors of a class of open MBeans, with the specified name, openType, description, and descriptor. The descriptor can contain entries that will define the values returned by certain methods of this class, as explained in the 
package description.
Params: name –  cannot be a null or empty string.
description –  cannot be a null or empty string.
openType –  cannot be null.
descriptor – The descriptor for the parameter.  This may be null
which is equivalent to an empty descriptor.
Throws: IllegalArgumentException – if name or 
description are null or empty string, or openType is null, or the descriptor entries are invalid as described in the package
description.
Since: 1.6/**
     * Constructs an {@code OpenMBeanParameterInfoSupport} instance,
     * which describes the parameter used in one or more operations or
     * constructors of a class of open MBeans, with the specified
     * {@code name}, {@code openType}, {@code description},
     * and {@code descriptor}.
     *
     * <p>The {@code descriptor} can contain entries that will define
     * the values returned by certain methods of this class, as
     * explained in the <a href="package-summary.html#constraints">
     * package description</a>.
     *
     * @param name  cannot be a null or empty string.
     *
     * @param description  cannot be a null or empty string.
     *
     * @param openType  cannot be null.
     *
     * @param descriptor The descriptor for the parameter.  This may be null
     * which is equivalent to an empty descriptor.
     *
     * @throws IllegalArgumentException if {@code name} or {@code
     * description} are null or empty string, or {@code openType} is
     * null, or the descriptor entries are invalid as described in the
     * <a href="package-summary.html#constraints">package
     * description</a>.
     *
     * @since 1.6
     */
    public OpenMBeanParameterInfoSupport(String name,
                                         String description,
                                         OpenType<?> openType,
                                         Descriptor descriptor) {


        // Construct parent's state
        //
        super(name,
              (openType==null) ? null : openType.getClassName(),
              description,
              ImmutableDescriptor.union(descriptor,(openType==null)?null:
                openType.getDescriptor()));

        // Initialize this instance's specific state
        //
        this.openType = openType;

        descriptor = getDescriptor();  // replace null by empty
        this.defaultValue = valueFrom(descriptor, "defaultValue", openType);
        this.legalValues = valuesFrom(descriptor, "legalValues", openType);
        this.minValue = comparableValueFrom(descriptor, "minValue", openType);
        this.maxValue = comparableValueFrom(descriptor, "maxValue", openType);

        try {
            check(this);
        } catch (OpenDataException e) {
            throw new IllegalArgumentException(e.getMessage(), e);
        }
    }


    Constructs an OpenMBeanParameterInfoSupport instance, which describes the parameter used in one or more operations or constructors of a class of open MBeans, with the specified name, openType, description and 
defaultValue. 
Params: name –  cannot be a null or empty string.
description –  cannot be a null or empty string.
openType –  cannot be null.
defaultValue – must be a valid value for the 
openType specified for this parameter; default value not supported for ArrayType and TabularType; can be null, in which case it means that no default value is set.
Type parameters: <T> – allows the compiler to check that the defaultValue, if non-null, has the correct Java type for the given openType.
Throws: IllegalArgumentException – if name or 
description are null or empty string, or openType is null.
OpenDataException – if defaultValue is not a valid value for the specified openType, or 
defaultValue is non null and openType is an 
ArrayType or a TabularType./**
     * Constructs an {@code OpenMBeanParameterInfoSupport} instance,
     * which describes the parameter used in one or more operations or
     * constructors of a class of open MBeans, with the specified
     * {@code name}, {@code openType}, {@code description} and {@code
     * defaultValue}.
     *
     * @param name  cannot be a null or empty string.
     *
     * @param description  cannot be a null or empty string.
     *
     * @param openType  cannot be null.
     *
     * @param defaultValue must be a valid value for the {@code
     * openType} specified for this parameter; default value not
     * supported for {@code ArrayType} and {@code TabularType}; can be
     * null, in which case it means that no default value is set.
     *
     * @param <T> allows the compiler to check that the {@code defaultValue},
     * if non-null, has the correct Java type for the given {@code openType}.
     *
     * @throws IllegalArgumentException if {@code name} or {@code
     * description} are null or empty string, or {@code openType} is
     * null.
     *
     * @throws OpenDataException if {@code defaultValue} is not a
     * valid value for the specified {@code openType}, or {@code
     * defaultValue} is non null and {@code openType} is an {@code
     * ArrayType} or a {@code TabularType}.
     */
    public <T> OpenMBeanParameterInfoSupport(String   name,
                                             String   description,
                                             OpenType<T> openType,
                                             T        defaultValue)
            throws OpenDataException {
        this(name, description, openType, defaultValue, (T[]) null);
    }

    Constructs an OpenMBeanParameterInfoSupport instance, which describes the parameter used in one or more operations or constructors of a class of open MBeans, with the specified name, openType, description, 
defaultValue and legalValues.
The contents of legalValues are copied, so subsequent modifications of the array referenced by legalValues have no impact on this OpenMBeanParameterInfoSupport instance.
Params: name –  cannot be a null or empty string.
description –  cannot be a null or empty string.
openType –  cannot be null.
defaultValue – must be a valid value for the 
openType specified for this parameter; default value not supported for ArrayType and TabularType; can be null, in which case it means that no default value is set.
legalValues – each contained value must be valid for the openType specified for this parameter; legal values not supported for ArrayType and TabularType; can be null or empty.
Type parameters: <T> – allows the compiler to check that the 
defaultValue and legalValues, if non-null, have the correct Java type for the given openType.
Throws: IllegalArgumentException – if name or 
description are null or empty string, or openType is null.
OpenDataException – if defaultValue is not a valid value for the specified openType, or one value in legalValues is not valid for the specified 
openType, or defaultValue is non null and 
openType is an ArrayType or a TabularType, or legalValues is non null and non empty and 
openType is an ArrayType or a TabularType, or legalValues is non null and non empty and 
defaultValue is not contained in legalValues./**
     * <p>Constructs an {@code OpenMBeanParameterInfoSupport} instance,
     * which describes the parameter used in one or more operations or
     * constructors of a class of open MBeans, with the specified
     * {@code name}, {@code openType}, {@code description}, {@code
     * defaultValue} and {@code legalValues}.</p>
     *
     * <p>The contents of {@code legalValues} are copied, so subsequent
     * modifications of the array referenced by {@code legalValues}
     * have no impact on this {@code OpenMBeanParameterInfoSupport}
     * instance.</p>
     *
     * @param name  cannot be a null or empty string.
     *
     * @param description  cannot be a null or empty string.
     *
     * @param openType  cannot be null.
     *
     * @param defaultValue must be a valid value for the {@code
     * openType} specified for this parameter; default value not
     * supported for {@code ArrayType} and {@code TabularType}; can be
     * null, in which case it means that no default value is set.
     *
     * @param legalValues each contained value must be valid for the
     * {@code openType} specified for this parameter; legal values not
     * supported for {@code ArrayType} and {@code TabularType}; can be
     * null or empty.
     *
     * @param <T> allows the compiler to check that the {@code
     * defaultValue} and {@code legalValues}, if non-null, have the
     * correct Java type for the given {@code openType}.
     *
     * @throws IllegalArgumentException if {@code name} or {@code
     * description} are null or empty string, or {@code openType} is
     * null.
     *
     * @throws OpenDataException if {@code defaultValue} is not a
     * valid value for the specified {@code openType}, or one value in
     * {@code legalValues} is not valid for the specified {@code
     * openType}, or {@code defaultValue} is non null and {@code
     * openType} is an {@code ArrayType} or a {@code TabularType}, or
     * {@code legalValues} is non null and non empty and {@code
     * openType} is an {@code ArrayType} or a {@code TabularType}, or
     * {@code legalValues} is non null and non empty and {@code
     * defaultValue} is not contained in {@code legalValues}.
     */
    public <T> OpenMBeanParameterInfoSupport(String   name,
                                             String   description,
                                             OpenType<T> openType,
                                             T        defaultValue,
                                             T[]      legalValues)
            throws OpenDataException {
        this(name, description, openType,
             defaultValue, legalValues, null, null);
    }


    Constructs an OpenMBeanParameterInfoSupport instance, which describes the parameter used in one or more operations or constructors of a class of open MBeans, with the specified name, openType, description, 
defaultValue, minValue and maxValue. It is possible to specify minimal and maximal values only for an open type whose values are Comparable. 
Params: name –  cannot be a null or empty string.
description –  cannot be a null or empty string.
openType –  cannot be null.
defaultValue – must be a valid value for the 
openType specified for this parameter; default value not supported for ArrayType and TabularType; can be null, in which case it means that no default value is set.
minValue – must be valid for the openType specified for this parameter; can be null, in which case it means that no minimal value is set.
maxValue – must be valid for the openType specified for this parameter; can be null, in which case it means that no maximal value is set.
Type parameters: <T> – allows the compiler to check that the 
defaultValue, minValue, and maxValue, if non-null, have the correct Java type for the given 
openType.
Throws: IllegalArgumentException – if name or 
description are null or empty string, or openType is null.
OpenDataException – if defaultValue, 
minValue or maxValue is not a valid value for the specified openType, or defaultValue is non null and openType is an ArrayType or a 
TabularType, or both minValue and maxValue are non-null and minValue.compareTo(maxValue) > 0 is 
true, or both defaultValue and minValue are non-null and minValue.compareTo(defaultValue) > 0 is true, or both defaultValue and maxValue are non-null and defaultValue.compareTo(maxValue) > 0 is true./**
     * Constructs an {@code OpenMBeanParameterInfoSupport} instance,
     * which describes the parameter used in one or more operations or
     * constructors of a class of open MBeans, with the specified
     * {@code name}, {@code openType}, {@code description}, {@code
     * defaultValue}, {@code minValue} and {@code maxValue}.
     *
     * It is possible to specify minimal and maximal values only for
     * an open type whose values are {@code Comparable}.
     *
     * @param name  cannot be a null or empty string.
     *
     * @param description  cannot be a null or empty string.
     *
     * @param openType  cannot be null.
     *
     * @param defaultValue must be a valid value for the {@code
     * openType} specified for this parameter; default value not
     * supported for {@code ArrayType} and {@code TabularType}; can be
     * null, in which case it means that no default value is set.
     *
     * @param minValue must be valid for the {@code openType}
     * specified for this parameter; can be null, in which case it
     * means that no minimal value is set.
     *
     * @param maxValue must be valid for the {@code openType}
     * specified for this parameter; can be null, in which case it
     * means that no maximal value is set.
     *
     * @param <T> allows the compiler to check that the {@code
     * defaultValue}, {@code minValue}, and {@code maxValue}, if
     * non-null, have the correct Java type for the given {@code
     * openType}.
     *
     * @throws IllegalArgumentException if {@code name} or {@code
     * description} are null or empty string, or {@code openType} is
     * null.
     *
     * @throws OpenDataException if {@code defaultValue}, {@code
     * minValue} or {@code maxValue} is not a valid value for the
     * specified {@code openType}, or {@code defaultValue} is non null
     * and {@code openType} is an {@code ArrayType} or a {@code
     * TabularType}, or both {@code minValue} and {@code maxValue} are
     * non-null and {@code minValue.compareTo(maxValue) > 0} is {@code
     * true}, or both {@code defaultValue} and {@code minValue} are
     * non-null and {@code minValue.compareTo(defaultValue) > 0} is
     * {@code true}, or both {@code defaultValue} and {@code maxValue}
     * are non-null and {@code defaultValue.compareTo(maxValue) > 0}
     * is {@code true}.
     */
    public <T> OpenMBeanParameterInfoSupport(String     name,
                                             String     description,
                                             OpenType<T>   openType,
                                             T          defaultValue,
                                             Comparable<T> minValue,
                                             Comparable<T> maxValue)
            throws OpenDataException {
        this(name, description, openType,
             defaultValue, null, minValue, maxValue);
    }

    private <T> OpenMBeanParameterInfoSupport(String name,
                                              String description,
                                              OpenType<T> openType,
                                              T defaultValue,
                                              T[] legalValues,
                                              Comparable<T> minValue,
                                              Comparable<T> maxValue)
            throws OpenDataException {
        super(name,
              (openType == null) ? null : openType.getClassName(),
              description,
              makeDescriptor(openType,
                             defaultValue, legalValues, minValue, maxValue));

        this.openType = openType;

        Descriptor d = getDescriptor();
        this.defaultValue = defaultValue;
        this.minValue = minValue;
        this.maxValue = maxValue;
        // We already converted the array into an unmodifiable Set
        // in the descriptor.
        this.legalValues = (Set<?>) d.getFieldValue("legalValues");

        check(this);
    }

    An object serialized in a version of the API before Descriptors were
added to this class will have an empty or null Descriptor.
For consistency with our
behavior in this version, we must replace the object with one
where the Descriptors reflect the same values of openType, defaultValue,
etc.
/**
     * An object serialized in a version of the API before Descriptors were
     * added to this class will have an empty or null Descriptor.
     * For consistency with our
     * behavior in this version, we must replace the object with one
     * where the Descriptors reflect the same values of openType, defaultValue,
     * etc.
     **/
    private Object readResolve() {
        if (getDescriptor().getFieldNames().length == 0) {
            // This noise allows us to avoid "unchecked" warnings without
            // having to suppress them explicitly.
            OpenType<Object> xopenType = cast(openType);
            Set<Object> xlegalValues = cast(legalValues);
            Comparable<Object> xminValue = cast(minValue);
            Comparable<Object> xmaxValue = cast(maxValue);
            return new OpenMBeanParameterInfoSupport(
                    name, description, openType,
                    makeDescriptor(xopenType, defaultValue, xlegalValues,
                                   xminValue, xmaxValue));
        } else
            return this;
    }

    Returns the open type for the values of the parameter described by this OpenMBeanParameterInfoSupport instance. /**
     * Returns the open type for the values of the parameter described
     * by this {@code OpenMBeanParameterInfoSupport} instance.
     */
    public OpenType<?> getOpenType() {
        return openType;
    }

    Returns the default value for the parameter described by this OpenMBeanParameterInfoSupport instance, if specified, or null otherwise. /**
     * Returns the default value for the parameter described by this
     * {@code OpenMBeanParameterInfoSupport} instance, if specified,
     * or {@code null} otherwise.
     */
    public Object getDefaultValue() {

        // Special case for ArrayType and TabularType
        // [JF] TODO: clone it so that it cannot be altered,
        // [JF] TODO: if we decide to support defaultValue as an array itself.
        // [JF] As of today (oct 2000) it is not supported so
        // defaultValue is null for arrays. Nothing to do.

        return defaultValue;
    }

    Returns an unmodifiable Set of legal values for the parameter described by this OpenMBeanParameterInfoSupport instance, if specified, or null otherwise. /**
     * Returns an unmodifiable Set of legal values for the parameter
     * described by this {@code OpenMBeanParameterInfoSupport}
     * instance, if specified, or {@code null} otherwise.
     */
    public Set<?> getLegalValues() {

        // Special case for ArrayType and TabularType
        // [JF] TODO: clone values so that they cannot be altered,
        // [JF] TODO: if we decide to support LegalValues as an array itself.
        // [JF] As of today (oct 2000) it is not supported so
        // legalValues is null for arrays. Nothing to do.

        // Returns our legalValues Set (set was constructed unmodifiable)
        return (legalValues);
    }

    Returns the minimal value for the parameter described by this OpenMBeanParameterInfoSupport instance, if specified, or null otherwise. /**
     * Returns the minimal value for the parameter described by this
     * {@code OpenMBeanParameterInfoSupport} instance, if specified,
     * or {@code null} otherwise.
     */
    public Comparable<?> getMinValue() {

        // Note: only comparable values have a minValue, so that's not
        // the case of arrays and tabulars (always null).

        return minValue;
    }

    Returns the maximal value for the parameter described by this OpenMBeanParameterInfoSupport instance, if specified, or null otherwise. /**
     * Returns the maximal value for the parameter described by this
     * {@code OpenMBeanParameterInfoSupport} instance, if specified,
     * or {@code null} otherwise.
     */
    public Comparable<?> getMaxValue() {

        // Note: only comparable values have a maxValue, so that's not
        // the case of arrays and tabulars (always null).

        return maxValue;
    }

    Returns true if this 
OpenMBeanParameterInfoSupport instance specifies a non-null default value for the described parameter, false otherwise. /**
     * Returns {@code true} if this {@code
     * OpenMBeanParameterInfoSupport} instance specifies a non-null
     * default value for the described parameter, {@code false}
     * otherwise.
     */
    public boolean hasDefaultValue() {

        return (defaultValue != null);
    }

    Returns true if this 
OpenMBeanParameterInfoSupport instance specifies a non-null set of legal values for the described parameter, false otherwise. /**
     * Returns {@code true} if this {@code
     * OpenMBeanParameterInfoSupport} instance specifies a non-null
     * set of legal values for the described parameter, {@code false}
     * otherwise.
     */
    public boolean hasLegalValues() {

        return (legalValues != null);
    }

    Returns true if this 
OpenMBeanParameterInfoSupport instance specifies a non-null minimal value for the described parameter, false otherwise. /**
     * Returns {@code true} if this {@code
     * OpenMBeanParameterInfoSupport} instance specifies a non-null
     * minimal value for the described parameter, {@code false}
     * otherwise.
     */
    public boolean hasMinValue() {

        return (minValue != null);
    }

    Returns true if this 
OpenMBeanParameterInfoSupport instance specifies a non-null maximal value for the described parameter, false otherwise. /**
     * Returns {@code true} if this {@code
     * OpenMBeanParameterInfoSupport} instance specifies a non-null
     * maximal value for the described parameter, {@code false}
     * otherwise.
     */
    public boolean hasMaxValue() {

        return (maxValue != null);
    }


    Tests whether obj is a valid value for the parameter described by this OpenMBeanParameterInfo instance. 
Params: obj – the object to be tested.
Returns: true if obj is a valid value for the parameter described by this OpenMBeanParameterInfo instance, false otherwise./**
     * Tests whether {@code obj} is a valid value for the parameter
     * described by this {@code OpenMBeanParameterInfo} instance.
     *
     * @param obj the object to be tested.
     *
     * @return {@code true} if {@code obj} is a valid value
     * for the parameter described by this
     * {@code OpenMBeanParameterInfo} instance,
     * {@code false} otherwise.
     */
    public boolean isValue(Object obj) {
        return OpenMBeanAttributeInfoSupport.isValue(this, obj);
        // compiler bug? should be able to omit class name here
        // also below in toString and hashCode
    }


    /* ***  Commodity methods from java.lang.Object  *** */


    Compares the specified obj parameter with this 
OpenMBeanParameterInfoSupport instance for equality.
Returns true if and only if all of the following statements are true: 

obj is non null,
obj also implements the OpenMBeanParameterInfo interface,
their names are equal
their open types are equal
their default, min, max and legal values are equal.
 This ensures that this equals method works properly for obj parameters which are different implementations of the OpenMBeanParameterInfo interface. If obj also implements DescriptorRead, then its getDescriptor() method must also return the same value as for this object.
Params: obj – the object to be compared for equality with this OpenMBeanParameterInfoSupport instance.
Returns: true if the specified object is equal to this OpenMBeanParameterInfoSupport instance./**
     * <p>Compares the specified {@code obj} parameter with this {@code
     * OpenMBeanParameterInfoSupport} instance for equality.</p>
     *
     * <p>Returns {@code true} if and only if all of the following
     * statements are true:
     *
     * <ul>
     * <li>{@code obj} is non null,</li>
     * <li>{@code obj} also implements the {@code OpenMBeanParameterInfo}
     * interface,</li>
     * <li>their names are equal</li>
     * <li>their open types are equal</li>
     * <li>their default, min, max and legal values are equal.</li>
     * </ul>
     * This ensures that this {@code equals} method works properly for
     * {@code obj} parameters which are different implementations of
     * the {@code OpenMBeanParameterInfo} interface.
     *
     * <p>If {@code obj} also implements {@link DescriptorRead}, then its
     * {@link DescriptorRead#getDescriptor() getDescriptor()} method must
     * also return the same value as for this object.</p>
     *
     * @param obj the object to be compared for equality with this
     * {@code OpenMBeanParameterInfoSupport} instance.
     *
     * @return {@code true} if the specified object is equal to this
     * {@code OpenMBeanParameterInfoSupport} instance.
     */
    public boolean equals(Object obj) {
        if (!(obj instanceof OpenMBeanParameterInfo))
            return false;

        OpenMBeanParameterInfo other = (OpenMBeanParameterInfo) obj;

        return equal(this, other);
    }

    Returns the hash code value for this 
OpenMBeanParameterInfoSupport instance.
The hash code of an OpenMBeanParameterInfoSupport instance is the sum of the hash codes of all elements of information used in equals comparisons (ie: its name, its open type, its default, min, max and legal
values, and its Descriptor).
This ensures that t1.equals(t2) implies that 
t1.hashCode()==t2.hashCode() for any two 
OpenMBeanParameterInfoSupport instances t1 and 
t2, as required by the general contract of the method Object.hashCode(). 
However, note that another instance of a class implementing the OpenMBeanParameterInfo interface may be equal to this OpenMBeanParameterInfoSupport instance as defined by equals(Object), but may have a different hash code if it is calculated differently. 
As OpenMBeanParameterInfoSupport instances are immutable, the hash code for this instance is calculated once, on the first call to hashCode, and then the same value is returned for subsequent calls. 
Returns: the hash code value for this 
OpenMBeanParameterInfoSupport instance/**
     * <p>Returns the hash code value for this {@code
     * OpenMBeanParameterInfoSupport} instance.</p>
     *
     * <p>The hash code of an {@code OpenMBeanParameterInfoSupport}
     * instance is the sum of the hash codes of all elements of
     * information used in {@code equals} comparisons (ie: its name,
     * its <i>open type</i>, its default, min, max and legal
     * values, and its Descriptor).
     *
     * <p>This ensures that {@code t1.equals(t2)} implies that {@code
     * t1.hashCode()==t2.hashCode()} for any two {@code
     * OpenMBeanParameterInfoSupport} instances {@code t1} and {@code
     * t2}, as required by the general contract of the method {@link
     * Object#hashCode() Object.hashCode()}.
     *
     * <p>However, note that another instance of a class implementing
     * the {@code OpenMBeanParameterInfo} interface may be equal to
     * this {@code OpenMBeanParameterInfoSupport} instance as defined
     * by {@link #equals(java.lang.Object)}, but may have a different
     * hash code if it is calculated differently.
     *
     * <p>As {@code OpenMBeanParameterInfoSupport} instances are
     * immutable, the hash code for this instance is calculated once,
     * on the first call to {@code hashCode}, and then the same value
     * is returned for subsequent calls.
     *
     * @return the hash code value for this {@code
     * OpenMBeanParameterInfoSupport} instance
     */
    public int hashCode() {

        // Calculate the hash code value if it has not yet been done
        // (ie 1st call to hashCode())
        //
        if (myHashCode == null)
            myHashCode = OpenMBeanAttributeInfoSupport.hashCode(this);

        // return always the same hash code for this instance (immutable)
        //
        return myHashCode.intValue();
    }

    Returns a string representation of this OpenMBeanParameterInfoSupport instance.  The string representation consists of the name of this class (i.e. javax.management.openmbean.OpenMBeanParameterInfoSupport), the string representation of the name and open type of the described parameter, the string representation of its default, min, max and legal values and the string representation of its descriptor. 
 As OpenMBeanParameterInfoSupport instances are immutable, the string representation for this instance is calculated once, on the first call to toString, and then the same value is returned for subsequent calls. 
Returns: a string representation of this OpenMBeanParameterInfoSupport instance./**
     * Returns a string representation of this
     * {@code OpenMBeanParameterInfoSupport} instance.
     * <p>
     * The string representation consists of the name of this class (i.e.
     * {@code javax.management.openmbean.OpenMBeanParameterInfoSupport}),
     * the string representation of the name and open type of the described
     * parameter, the string representation of its default, min, max and legal
     * values and the string representation of its descriptor.
     * <p>
     * As {@code OpenMBeanParameterInfoSupport} instances are immutable,
     * the string representation for this instance is calculated once,
     * on the first call to {@code toString}, and then the same value
     * is returned for subsequent calls.
     *
     * @return a string representation of this
     * {@code OpenMBeanParameterInfoSupport} instance.
     */
    public String toString() {

        // Calculate the string value if it has not yet been done (ie
        // 1st call to toString())
        //
        if (myToString == null)
            myToString = OpenMBeanAttributeInfoSupport.toString(this);

        // return always the same string representation for this
        // instance (immutable)
        //
        return myToString;
    }

}
Params:	name – cannot be a null or empty string. description – cannot be a null or empty string. openType – cannot be null.
Throws:	IllegalArgumentException – if `name` or `description` are null or empty string, or `openType` is null.
Params:	name – cannot be a null or empty string. description – cannot be a null or empty string. openType – cannot be null. defaultValue – must be a valid value for the `openType` specified for this parameter; default value not supported for `ArrayType` and `TabularType`; can be null, in which case it means that no default value is set.
Type parameters:	<T> – allows the compiler to check that the `defaultValue`, if non-null, has the correct Java type for the given `openType`.
Throws:	IllegalArgumentException – if `name` or `description` are null or empty string, or `openType` is null. OpenDataException – if `defaultValue` is not a valid value for the specified `openType`, or `defaultValue` is non null and `openType` is an `ArrayType` or a `TabularType`.
Params:	obj – the object to be tested.
Returns:	`true` if `obj` is a valid value for the parameter described by this `OpenMBeanParameterInfo` instance, `false` otherwise.
Params:	obj – the object to be compared for equality with this `OpenMBeanParameterInfoSupport` instance.
Returns:	`true` if the specified object is equal to this `OpenMBeanParameterInfoSupport` instance.
/

java/ 11/ java.management/javax/management/openmbean/OpenMBeanParameterInfoSupport.java
