https://openjdk.java.net/ 
/*
 * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved.
 * 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */


package javax.management.openmbean;


// java import
//
import java.io.Serializable;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;

// jmx import
import java.util.TreeSet;
//



The CompositeDataSupport class is the open data class which implements the CompositeData interface. 
Since:1.5
/**
 * The {@code CompositeDataSupport} class is the <i>open data</i> class which
 * implements the {@code CompositeData} interface.
 *
 *
 * @since 1.5
 */
public class CompositeDataSupport
    implements CompositeData, Serializable {

    /* Serial version */
    static final long serialVersionUID = 8003518976613702244L;

    
@serialInternal representation of the mapping of item names to their respective values. A SortedMap is used for faster retrieval of elements.
/**
     * @serial Internal representation of the mapping of item names to their
     * respective values.
     *         A {@link SortedMap} is used for faster retrieval of elements.
     */
    private final SortedMap<String, Object> contents;

    
@serialThe composite type  of this composite data instance.
/**
     * @serial The <i>composite type </i> of this <i>composite data</i> instance.
     */
    private final CompositeType compositeType;

    
Constructs a CompositeDataSupport instance with the specified compositeType, whose item values are specified by itemValues[], in the same order as in itemNames[]. As a CompositeType does not specify any order on its items, the itemNames[] parameter is used to specify the order in which the values are given in itemValues[]. The items contained in this CompositeDataSupport instance are internally stored in a TreeMap, thus sorted in ascending lexicographic order of their names, for faster retrieval of individual item values.


The constructor checks that all the constraints listed below for each
parameter are satisfied,
and throws the appropriate exception if they are not.


Params:
  • compositeType – the composite type  of this composite
data instance; must not be null.
  • itemNames – itemNames must list, in any order, all the item names defined in compositeType; the order in which the names are listed, is used to match values in itemValues[]; must not be null or empty.
  • itemValues – the values of the items, listed in the same order as their respective names in itemNames; each item value can be null, but if it is non-null it must be a valid value for the open type defined in compositeType for the corresponding item; must be of the same size as itemNames; must not be null or empty.
Throws:
  • IllegalArgumentException – compositeType is null, or itemNames[] or itemValues[] is null or empty, or one of the elements in itemNames[] is a null or empty string, or itemNames[] and itemValues[] are not of the same size.
  • OpenDataException – itemNames[] or itemValues[]'s size differs from the number of items defined in compositeType, or one of the elements in itemNames[] does not exist as an item name defined in compositeType, or one of the elements in itemValues[] is not a valid value for the corresponding item as defined in compositeType.
/**
     * <p>Constructs a {@code CompositeDataSupport} instance with the specified
     * {@code compositeType}, whose item values
     * are specified by {@code itemValues[]}, in the same order as in
     * {@code itemNames[]}.
     * As a {@code CompositeType} does not specify any order on its items,
     * the {@code itemNames[]} parameter is used
     * to specify the order in which the values are given in {@code itemValues[]}.
     * The items contained in this {@code CompositeDataSupport} instance are
     * internally stored in a {@code TreeMap},
     * thus sorted in ascending lexicographic order of their names, for faster
     * retrieval of individual item values.</p>
     *
     * <p>The constructor checks that all the constraints listed below for each
     * parameter are satisfied,
     * and throws the appropriate exception if they are not.</p>
     *
     * @param compositeType the <i>composite type </i> of this <i>composite
     * data</i> instance; must not be null.
     *
     * @param itemNames {@code itemNames} must list, in any order, all the
     * item names defined in {@code compositeType}; the order in which the
     * names are listed, is used to match values in {@code itemValues[]}; must
     * not be null or empty.
     *
     * @param itemValues the values of the items, listed in the same order as
     * their respective names in {@code itemNames}; each item value can be
     * null, but if it is non-null it must be a valid value for the open type
     * defined in {@code compositeType} for the corresponding item; must be of
     * the same size as {@code itemNames}; must not be null or empty.
     *
     * @throws IllegalArgumentException {@code compositeType} is null, or
     * {@code itemNames[]} or {@code itemValues[]} is null or empty, or one
     * of the elements in {@code itemNames[]} is a null or empty string, or
     * {@code itemNames[]} and {@code itemValues[]} are not of the same size.
     *
     * @throws OpenDataException {@code itemNames[]} or
     * {@code itemValues[]}'s size differs from the number of items defined in
     * {@code compositeType}, or one of the elements in {@code itemNames[]}
     * does not exist as an item name defined in {@code compositeType}, or one
     * of the elements in {@code itemValues[]} is not a valid value for the
     * corresponding item as defined in {@code compositeType}.
     */
    public CompositeDataSupport(
            CompositeType compositeType, String[] itemNames, Object[] itemValues)
            throws OpenDataException {
        this(makeMap(itemNames, itemValues), compositeType);
    }

    private static SortedMap<String, Object> makeMap(
            String[] itemNames, Object[] itemValues)
            throws OpenDataException {

        if (itemNames == null || itemValues == null)
            throw new IllegalArgumentException("Null itemNames or itemValues");
        if (itemNames.length == 0 || itemValues.length == 0)
            throw new IllegalArgumentException("Empty itemNames or itemValues");
        if (itemNames.length != itemValues.length) {
            throw new IllegalArgumentException(
                    "Different lengths: itemNames[" + itemNames.length +
                    "], itemValues[" + itemValues.length + "]");
        }

        SortedMap<String, Object> map = new TreeMap<String, Object>();
        for (int i = 0; i < itemNames.length; i++) {
            String name = itemNames[i];
            if (name == null || name.equals(""))
                throw new IllegalArgumentException("Null or empty item name");
            if (map.containsKey(name))
                throw new OpenDataException("Duplicate item name " + name);
            map.put(itemNames[i], itemValues[i]);
        }

        return map;
    }

    
 Constructs a CompositeDataSupport instance with the specified compositeType, whose item names and corresponding values are given by the mappings in the map items. This constructor converts the keys to a string array and the values to an object array and calls CompositeDataSupport(javax.management.openmbean.CompositeType, java.lang.String[], java.lang.Object[]). 
Params:
  • compositeType –  the composite type  of this composite data instance;
                       must not be null.
  • items –  the mappings of all the item names to their values; items must contain all the item names defined in compositeType; must not be null or empty.
Throws:
  • IllegalArgumentException – compositeType is null, or items is null or empty, or one of the keys in items is a null or empty string.
  • OpenDataException – items' size differs from the number of items defined in compositeType, or one of the keys in items does not exist as an item name defined in compositeType, or one of the values in items is not a valid value for the corresponding item as defined in compositeType.
  • ArrayStoreException – one or more keys in items is not of the class java.lang.String.
/**
     * <p>
     * Constructs a {@code CompositeDataSupport} instance with the specified {@code compositeType},
     * whose item names and corresponding values
     * are given by the mappings in the map {@code items}.
     * This constructor converts the keys to a string array and the values to an object array and calls
     * {@code CompositeDataSupport(javax.management.openmbean.CompositeType, java.lang.String[], java.lang.Object[])}.
     *
     * @param  compositeType  the <i>composite type </i> of this <i>composite data</i> instance;
     *                        must not be null.
     * @param  items  the mappings of all the item names to their values;
     *                {@code items} must contain all the item names defined in {@code compositeType};
     *                must not be null or empty.
     *
     * @throws IllegalArgumentException {@code compositeType} is null, or
     * {@code items} is null or empty, or one of the keys in {@code items} is a null
     * or empty string.
     * @throws OpenDataException {@code items}' size differs from the
     * number of items defined in {@code compositeType}, or one of the
     * keys in {@code items} does not exist as an item name defined in
     * {@code compositeType}, or one of the values in {@code items}
     * is not a valid value for the corresponding item as defined in
     * {@code compositeType}.
     * @throws ArrayStoreException one or more keys in {@code items} is not of
     * the class {@code java.lang.String}.
     */
    public CompositeDataSupport(CompositeType compositeType,
                                Map<String,?> items)
            throws OpenDataException {
        this(makeMap(items), compositeType);
    }

    private static SortedMap<String, Object> makeMap(Map<String, ?> items) {
        if (items == null || items.isEmpty())
            throw new IllegalArgumentException("Null or empty items map");

        SortedMap<String, Object> map = new TreeMap<String, Object>();
        for (Object key : items.keySet()) {
            if (key == null || key.equals(""))
                throw new IllegalArgumentException("Null or empty item name");
            if (!(key instanceof String)) {
                throw new ArrayStoreException("Item name is not string: " + key);
                // This can happen because of erasure.  The particular
                // exception is a historical artifact - an implementation
                // detail that leaked into the API.
            }
            map.put((String) key, items.get(key));
        }
        return map;
    }

    private CompositeDataSupport(
            SortedMap<String, Object> items, CompositeType compositeType)
            throws OpenDataException {

        // Check compositeType is not null
        //
        if (compositeType == null) {
            throw new IllegalArgumentException("Argument compositeType cannot be null.");
        }

        // item names defined in compositeType:
        Set<String> namesFromType = compositeType.keySet();
        Set<String> namesFromItems = items.keySet();

        // This is just a comparison, but we do it this way for a better
        // exception message.
        if (!namesFromType.equals(namesFromItems)) {
            Set<String> extraFromType = new TreeSet<String>(namesFromType);
            extraFromType.removeAll(namesFromItems);
            Set<String> extraFromItems = new TreeSet<String>(namesFromItems);
            extraFromItems.removeAll(namesFromType);
            if (!extraFromType.isEmpty() || !extraFromItems.isEmpty()) {
                throw new OpenDataException(
                        "Item names do not match CompositeType: " +
                        "names in items but not in CompositeType: " + extraFromItems +
                        "; names in CompositeType but not in items: " + extraFromType);
            }
        }

        // Check each value, if not null, is of the open type defined for the
        // corresponding item
        for (String name : namesFromType) {
            Object value = items.get(name);
            if (value != null) {
                OpenType<?> itemType = compositeType.getType(name);
                if (!itemType.isValue(value)) {
                    throw new OpenDataException(
                            "Argument value of wrong type for item " + name +
                            ": value " + value + ", type " + itemType);
                }
            }
        }

        // Initialize internal fields: compositeType and contents
        //
        this.compositeType = compositeType;
        this.contents = items;
    }

    
Returns the composite type  of this composite data instance.

/**
     * Returns the <i>composite type </i> of this <i>composite data</i> instance.
     */
    public CompositeType getCompositeType() {

        return compositeType;
    }

    
Returns the value of the item whose name is key. 
Throws:
/**
     * Returns the value of the item whose name is {@code key}.
     *
     * @throws IllegalArgumentException  if {@code key} is a null or empty String.
     *
     * @throws InvalidKeyException  if {@code key} is not an existing item name for
     * this {@code CompositeData} instance.
     */
    public Object get(String key) {

        if ( (key == null) || (key.trim().equals("")) ) {
            throw new IllegalArgumentException("Argument key cannot be a null or empty String.");
        }
        if ( ! contents.containsKey(key.trim())) {
            throw new InvalidKeyException("Argument key=\""+ key.trim() +"\" is not an existing item name for this CompositeData instance.");
        }
        return contents.get(key.trim());
    }

    
Returns an array of the values of the items whose names are specified by keys, in the same order as keys. 
Throws:
/**
     * Returns an array of the values of the items whose names are specified by
     * {@code keys}, in the same order as {@code keys}.
     *
     * @throws IllegalArgumentException  if an element in {@code keys} is a null
     * or empty String.
     *
     * @throws InvalidKeyException  if an element in {@code keys} is not an existing
     * item name for this {@code CompositeData} instance.
     */
    public Object[] getAll(String[] keys) {

        if ( (keys == null) || (keys.length == 0) ) {
            return new Object[0];
        }
        Object[] results = new Object[keys.length];
        for (int i=0; i<keys.length; i++) {
            results[i] = this.get(keys[i]);
        }
        return results;
    }

    
Returns true if and only if this CompositeData instance contains an item whose name is key. If key is a null or empty String, this method simply returns false. 
/**
     * Returns {@code true} if and only if this {@code CompositeData} instance contains
     * an item whose name is {@code key}.
     * If {@code key} is a null or empty String, this method simply returns false.
     */
    public boolean containsKey(String key) {

        if ( (key == null) || (key.trim().equals("")) ) {
            return false;
        }
        return contents.containsKey(key);
    }

    
Returns true if and only if this CompositeData instance contains an item whose value is value. 
/**
     * Returns {@code true} if and only if this {@code CompositeData} instance
     * contains an item
     * whose value is {@code value}.
     */
    public boolean containsValue(Object value) {

        return contents.containsValue(value);
    }

    
Returns an unmodifiable Collection view of the item values contained in this CompositeData instance. The returned collection's iterator will return the values in the ascending lexicographic order of the corresponding item names. 
/**
     * Returns an unmodifiable Collection view of the item values contained in this
     * {@code CompositeData} instance.
     * The returned collection's iterator will return the values in the ascending
     * lexicographic order of the corresponding
     * item names.
     */
    public Collection<?> values() {

        return Collections.unmodifiableCollection(contents.values());
    }

    
Compares the specified obj parameter with this
CompositeDataSupport instance for equality.

 Returns true if and only if all of the following statements are true: 
    

  • obj is non null,
    • 

  • obj also implements the CompositeData interface,
    • 

  • their composite types are equal
    • 

  • their contents, i.e. (name, value) pairs are equal. If a value contained in the content is an array, the value comparison is done as if by calling the deepEquals method for arrays of object reference types or the appropriate overloading of Arrays.equals(e1,e2) for arrays of primitive types
    • 



 This ensures that this equals method works properly for obj parameters which are different implementations of the
CompositeData interface, with the restrictions mentioned in the equals method of the java.util.Collection interface. 
Params:
  • obj –  the object to be compared for equality with this
CompositeDataSupport instance.
Returns: true if the specified object is equal to this
CompositeDataSupport instance.
/**
     * Compares the specified <var>obj</var> parameter with this
     * <code>CompositeDataSupport</code> instance for equality.
     * <p>
     * Returns {@code true} if and only if all of the following statements are true:
     * <ul>
     * <li><var>obj</var> is non null,</li>
     * <li><var>obj</var> also implements the <code>CompositeData</code> interface,</li>
     * <li>their composite types are equal</li>
     * <li>their contents, i.e. (name, value) pairs are equal. If a value contained in
     * the content is an array, the value comparison is done as if by calling
     * the {@link java.util.Arrays#deepEquals(Object[], Object[]) deepEquals} method
     * for arrays of object reference types or the appropriate overloading of
     * {@code Arrays.equals(e1,e2)} for arrays of primitive types</li>
     * </ul>
     * <p>
     * This ensures that this {@code equals} method works properly for
     * <var>obj</var> parameters which are different implementations of the
     * <code>CompositeData</code> interface, with the restrictions mentioned in the
     * {@link java.util.Collection#equals(Object) equals}
     * method of the {@code java.util.Collection} interface.
     *
     * @param  obj  the object to be compared for equality with this
     * <code>CompositeDataSupport</code> instance.
     * @return  <code>true</code> if the specified object is equal to this
     * <code>CompositeDataSupport</code> instance.
     */
    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

        // if obj is not a CompositeData, return false
        if (!(obj instanceof CompositeData)) {
            return false;
        }

        CompositeData other = (CompositeData) obj;

        // their compositeType should be equal
        if (!this.getCompositeType().equals(other.getCompositeType()) ) {
            return false;
        }

        if (contents.size() != other.values().size()) {
            return false;
        }

        for (Map.Entry<String,Object> entry : contents.entrySet()) {
            Object e1 = entry.getValue();
            Object e2 = other.get(entry.getKey());

            if (e1 == e2)
                continue;
            if (e1 == null)
                return false;

            boolean eq = e1.getClass().isArray() ?
                Arrays.deepEquals(new Object[] {e1}, new Object[] {e2}) :
                e1.equals(e2);

            if (!eq)
                return false;
        }

        // All tests for equality were successful
        //
        return true;
    }

    
Returns the hash code value for this CompositeDataSupport instance.


The hash code of a CompositeDataSupport instance is the sum of the hash codes
of all elements of information used in equals comparisons
(ie: its composite type and all the item values).


This ensures that  t1.equals(t2)  implies that  t1.hashCode()==t2.hashCode() 
for any two CompositeDataSupport instances t1 and t2, as required by the general contract of the method Object.hashCode(). 
 Each item value's hash code is added to the returned hash code. If an item value is an array, its hash code is obtained as if by calling the deepHashCode method for arrays of object reference types or the appropriate overloading of Arrays.hashCode(e) for arrays of primitive types. 
Returns:the hash code value for this CompositeDataSupport instance
/**
     * Returns the hash code value for this <code>CompositeDataSupport</code> instance.
     * <p>
     * The hash code of a <code>CompositeDataSupport</code> instance is the sum of the hash codes
     * of all elements of information used in <code>equals</code> comparisons
     * (ie: its <i>composite type</i> and all the item values).
     * <p>
     * This ensures that <code> t1.equals(t2) </code> implies that <code> t1.hashCode()==t2.hashCode() </code>
     * for any two <code>CompositeDataSupport</code> instances <code>t1</code> and <code>t2</code>,
     * as required by the general contract of the method
     * {@link Object#hashCode() Object.hashCode()}.
     * <p>
     * Each item value's hash code is added to the returned hash code.
     * If an item value is an array,
     * its hash code is obtained as if by calling the
     * {@link java.util.Arrays#deepHashCode(Object[]) deepHashCode} method
     * for arrays of object reference types or the appropriate overloading
     * of {@code Arrays.hashCode(e)} for arrays of primitive types.
     *
     * @return the hash code value for this <code>CompositeDataSupport</code> instance
     */
    @Override
    public int hashCode() {
        int hashcode = compositeType.hashCode();

        for (Object o : contents.values()) {
            if (o instanceof Object[])
                hashcode += Arrays.deepHashCode((Object[]) o);
            else if (o instanceof byte[])
                hashcode += Arrays.hashCode((byte[]) o);
            else if (o instanceof short[])
                hashcode += Arrays.hashCode((short[]) o);
            else if (o instanceof int[])
                hashcode += Arrays.hashCode((int[]) o);
            else if (o instanceof long[])
                hashcode += Arrays.hashCode((long[]) o);
            else if (o instanceof char[])
                hashcode += Arrays.hashCode((char[]) o);
            else if (o instanceof float[])
                hashcode += Arrays.hashCode((float[]) o);
            else if (o instanceof double[])
                hashcode += Arrays.hashCode((double[]) o);
            else if (o instanceof boolean[])
                hashcode += Arrays.hashCode((boolean[]) o);
            else if (o != null)
                hashcode += o.hashCode();
        }

        return hashcode;
    }

    
Returns a string representation of this CompositeDataSupport instance.


The string representation consists of the name of this class (ie javax.management.openmbean.CompositeDataSupport),
the string representation of the composite type of this instance, and the string representation of the contents
(ie list the itemName=itemValue mappings).

Returns: a string representation of this CompositeDataSupport instance
/**
     * Returns a string representation of this <code>CompositeDataSupport</code> instance.
     * <p>
     * The string representation consists of the name of this class (ie <code>javax.management.openmbean.CompositeDataSupport</code>),
     * the string representation of the composite type of this instance, and the string representation of the contents
     * (ie list the itemName=itemValue mappings).
     *
     * @return  a string representation of this <code>CompositeDataSupport</code> instance
     */
    @Override
    public String toString() {
        return new StringBuilder()
            .append(this.getClass().getName())
            .append("(compositeType=")
            .append(compositeType.toString())
            .append(",contents=")
            .append(contentString())
            .append(")")
            .toString();
    }

    private String contentString() {
        StringBuilder sb = new StringBuilder("{");
        String sep = "";
        for (Map.Entry<String, Object> entry : contents.entrySet()) {
            sb.append(sep).append(entry.getKey()).append("=");
            String s = Arrays.deepToString(new Object[] {entry.getValue()});
            sb.append(s.substring(1, s.length() - 1));
            sep = ", ";
        }
        sb.append("}");
        return sb.toString();
    }
}