https://openjdk.java.net/ 
/*
 * Copyright (c) 2000, 2007, 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
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 * questions.
 */


package javax.management.openmbean;


// java import
//
import java.util.Set;
import java.util.TreeMap;
import java.util.Collections;
import java.util.Iterator;

// jmx import
//



The CompositeType class is the open type class whose instances describe the types of CompositeData values. 
Since:1.5
/**
 * The <code>CompositeType</code> class is the <i>open type</i> class
 * whose instances describe the types of {@link CompositeData <code>CompositeData</code>} values.
 *
 *
 * @since 1.5
 */
public class CompositeType extends OpenType<CompositeData> {

    /* Serial version */
    static final long serialVersionUID = -5366242454346948798L;

    
@serialSorted mapping of the item names to their descriptions
/**
     * @serial Sorted mapping of the item names to their descriptions
     */
    private TreeMap<String,String> nameToDescription;

    
@serialSorted mapping of the item names to their open types
/**
     * @serial Sorted mapping of the item names to their open types
     */
    private TreeMap<String,OpenType<?>> nameToType;

    /* As this instance is immutable, following three values need only
     * be calculated once.  */
    private transient Integer myHashCode = null;
    private transient String  myToString = null;
    private transient Set<String> myNamesSet = null;


    /* *** Constructor *** */

    
Constructs a CompositeType instance, checking for the validity of the given parameters.
The validity constraints are described below for each parameter.


Note that the contents of the three array parameters
itemNames, itemDescriptions and itemTypes
are internally copied so that any subsequent modification of these arrays by the caller of this constructor
has no impact on the constructed CompositeType instance.

 The Java class name of composite data values this composite type represents (ie the class name returned by the getClassName method) is set to the string value returned by CompositeData.class.getName().



Params:
  • typeName –  The name given to the composite type this instance represents; cannot be a null or empty string.

     
  • description –  The human readable description of the composite type this instance represents;
                     cannot be a null or empty string.

     
  • itemNames –  The names of the items contained in the
                   composite data values described by this CompositeType instance;
                   cannot be null and should contain at least one element; no element can be a null or empty string.
                   Note that the order in which the item names are given is not important to differentiate a
                   CompositeType instance from another;
                   the item names are internally stored sorted in ascending alphanumeric order.

     
  • itemDescriptions –  The descriptions, in the same order as itemNames, of the items contained in the
                          composite data values described by this CompositeType instance;
                          should be of the same size as itemNames;
                          no element can be a null or empty string.

     
  • itemTypes –  The open type instances, in the same order as itemNames, describing the items contained
                   in the composite data values described by this CompositeType instance;
                   should be of the same size as itemNames;
                   no element can be null.

     
Throws:
  • IllegalArgumentException –  If typeName or description is a null or empty string,
                                  or itemNames or itemDescriptions or itemTypes is null,
                                  or any element of itemNames or itemDescriptions
                                  is a null or empty string,
                                  or any element of itemTypes is null,
                                  or itemNames or itemDescriptions or itemTypes
                                  are not of the same size.

     
  • OpenDataException –  If itemNames contains duplicate item names
                           (case sensitive, but leading and trailing whitespaces removed).
/**
     * Constructs a <code>CompositeType</code> instance, checking for the validity of the given parameters.
     * The validity constraints are described below for each parameter.
     * <p>
     * Note that the contents of the three array parameters
     * <var>itemNames</var>, <var>itemDescriptions</var> and <var>itemTypes</var>
     * are internally copied so that any subsequent modification of these arrays by the caller of this constructor
     * has no impact on the constructed <code>CompositeType</code> instance.
     * <p>
     * The Java class name of composite data values this composite type represents
     * (ie the class name returned by the {@link OpenType#getClassName() getClassName} method)
     * is set to the string value returned by <code>CompositeData.class.getName()</code>.
     * <p>
     * @param  typeName  The name given to the composite type this instance represents; cannot be a null or empty string.
     * <br>&nbsp;
     * @param  description  The human readable description of the composite type this instance represents;
     *                      cannot be a null or empty string.
     * <br>&nbsp;
     * @param  itemNames  The names of the items contained in the
     *                    composite data values described by this <code>CompositeType</code> instance;
     *                    cannot be null and should contain at least one element; no element can be a null or empty string.
     *                    Note that the order in which the item names are given is not important to differentiate a
     *                    <code>CompositeType</code> instance from another;
     *                    the item names are internally stored sorted in ascending alphanumeric order.
     * <br>&nbsp;
     * @param  itemDescriptions  The descriptions, in the same order as <var>itemNames</var>, of the items contained in the
     *                           composite data values described by this <code>CompositeType</code> instance;
     *                           should be of the same size as <var>itemNames</var>;
     *                           no element can be a null or empty string.
     * <br>&nbsp;
     * @param  itemTypes  The open type instances, in the same order as <var>itemNames</var>, describing the items contained
     *                    in the composite data values described by this <code>CompositeType</code> instance;
     *                    should be of the same size as <var>itemNames</var>;
     *                    no element can be null.
     * <br>&nbsp;
     * @throws IllegalArgumentException  If <var>typeName</var> or <var>description</var> is a null or empty string,
     *                                   or <var>itemNames</var> or <var>itemDescriptions</var> or <var>itemTypes</var> is null,
     *                                   or any element of <var>itemNames</var> or <var>itemDescriptions</var>
     *                                   is a null or empty string,
     *                                   or any element of <var>itemTypes</var> is null,
     *                                   or <var>itemNames</var> or <var>itemDescriptions</var> or <var>itemTypes</var>
     *                                   are not of the same size.
     * <br>&nbsp;
     * @throws OpenDataException  If <var>itemNames</var> contains duplicate item names
     *                            (case sensitive, but leading and trailing whitespaces removed).
     */
    public CompositeType(String        typeName,
                         String        description,
                         String[]      itemNames,
                         String[]      itemDescriptions,
                         OpenType<?>[] itemTypes) throws OpenDataException {

        // Check and construct state defined by parent
        //
        super(CompositeData.class.getName(), typeName, description, false);

        // Check the 3 arrays are not null or empty (ie length==0) and that there is no null element or empty string in them
        //
        checkForNullElement(itemNames, "itemNames");
        checkForNullElement(itemDescriptions, "itemDescriptions");
        checkForNullElement(itemTypes, "itemTypes");
        checkForEmptyString(itemNames, "itemNames");
        checkForEmptyString(itemDescriptions, "itemDescriptions");

        // Check the sizes of the 3 arrays are the same
        //
        if ( (itemNames.length != itemDescriptions.length) || (itemNames.length != itemTypes.length) ) {
            throw new IllegalArgumentException("Array arguments itemNames[], itemDescriptions[] and itemTypes[] "+
                                               "should be of same length (got "+ itemNames.length +", "+
                                               itemDescriptions.length +" and "+ itemTypes.length +").");
        }

        // Initialize internal "names to descriptions" and "names to types" sorted maps,
        // and, by doing so, check there are no duplicate item names
        //
        nameToDescription = new TreeMap<String,String>();
        nameToType        = new TreeMap<String,OpenType<?>>();
        String key;
        for (int i=0; i<itemNames.length; i++) {
            key = itemNames[i].trim();
            if (nameToDescription.containsKey(key)) {
                throw new OpenDataException("Argument's element itemNames["+ i +"]=\""+ itemNames[i] +
                                            "\" duplicates a previous item names.");
            }
            nameToDescription.put(key, itemDescriptions[i].trim());
            nameToType.put(key, itemTypes[i]);
        }
    }

    private static void checkForNullElement(Object[] arg, String argName) {
        if ( (arg == null) || (arg.length == 0) ) {
            throw new IllegalArgumentException("Argument "+ argName +"[] cannot be null or empty.");
        }
        for (int i=0; i<arg.length; i++) {
            if (arg[i] == null) {
                throw new IllegalArgumentException("Argument's element "+ argName +"["+ i +"] cannot be null.");
            }
        }
    }

    private static void checkForEmptyString(String[] arg, String argName) {
        for (int i=0; i<arg.length; i++) {
            if (arg[i].trim().equals("")) {
                throw new IllegalArgumentException("Argument's element "+ argName +"["+ i +"] cannot be an empty string.");
            }
        }
    }

    /* *** Composite type specific information methods *** */

    
Returns true if this CompositeType instance defines an item
whose name is itemName.

Params:
  • itemName – the name of the item.
Returns:true if an item of this name is present.
/**
     * Returns <code>true</code> if this <code>CompositeType</code> instance defines an item
     * whose name is <var>itemName</var>.
     *
     * @param itemName the name of the item.
     *
     * @return true if an item of this name is present.
     */
    public boolean containsKey(String itemName) {

        if (itemName == null) {
            return false;
        }
        return nameToDescription.containsKey(itemName);
    }

    
Returns the description of the item whose name is itemName,
or null if this CompositeType instance does not define any item
whose name is itemName.

Params:
  • itemName – the name of the item.
Returns:the description.
/**
     * Returns the description of the item whose name is <var>itemName</var>,
     * or <code>null</code> if this <code>CompositeType</code> instance does not define any item
     * whose name is <var>itemName</var>.
     *
     * @param itemName the name of the item.
     *
     * @return the description.
     */
    public String getDescription(String itemName) {

        if (itemName == null) {
            return null;
        }
        return nameToDescription.get(itemName);
    }

    
Returns the open type of the item whose name is itemName,
or null if this CompositeType instance does not define any item
whose name is itemName.

Params:
  • itemName – the name of the time.
Returns:the type.
/**
     * Returns the <i>open type</i> of the item whose name is <var>itemName</var>,
     * or <code>null</code> if this <code>CompositeType</code> instance does not define any item
     * whose name is <var>itemName</var>.
     *
     * @param itemName the name of the time.
     *
     * @return the type.
     */
    public OpenType<?> getType(String itemName) {

        if (itemName == null) {
            return null;
        }
        return (OpenType<?>) nameToType.get(itemName);
    }

    
Returns an unmodifiable Set view of all the item names defined by this CompositeType instance.
The set's iterator will return the item names in ascending order.

Returns:a Set of String.
/**
     * Returns an unmodifiable Set view of all the item names defined by this <code>CompositeType</code> instance.
     * The set's iterator will return the item names in ascending order.
     *
     * @return a {@link Set} of {@link String}.
     */
    public Set<String> keySet() {

        // Initializes myNamesSet on first call
        if (myNamesSet == null) {
            myNamesSet = Collections.unmodifiableSet(nameToDescription.keySet());
        }

        return myNamesSet; // always return the same value
    }


    
Tests whether obj is a value which could be
described by this CompositeType instance.

If obj is null or is not an instance of
javax.management.openmbean.CompositeData,
isValue returns false.


If obj is an instance of
javax.management.openmbean.CompositeData, then let ct be its CompositeType as returned by CompositeData.getCompositeType(). The result is true if this is assignable from ct. This means that:


    

  • this.getTypeName() equals ct.getTypeName(), and 
  • there are no item names present in this that are not also present in ct, and 
  • for every item in this, its type is assignable from the type of the corresponding item in ct. 


A TabularType is assignable from another 
TabularType if they have the same typeName and index name list, and the row type of the first is assignable from the row type of the second. 
An ArrayType is assignable from another 
ArrayType if they have the same dimension; and both are primitive arrays or neither is; and the element
type of the first is assignable from the element type of the second. 
In every other case, an OpenType is assignable from another OpenType only if they are equal.


These rules mean that extra items can be added to a 
CompositeData without making it invalid for a CompositeType that does not have those items.


Params:
  • obj –  the value whose open type is to be tested for compatibility
with this CompositeType instance.
Returns:true if obj is a value for this
composite type, false otherwise.
/**
     * Tests whether <var>obj</var> is a value which could be
     * described by this <code>CompositeType</code> instance.
     *
     * <p>If <var>obj</var> is null or is not an instance of
     * <code>javax.management.openmbean.CompositeData</code>,
     * <code>isValue</code> returns <code>false</code>.</p>
     *
     * <p>If <var>obj</var> is an instance of
     * <code>javax.management.openmbean.CompositeData</code>, then let
     * {@code ct} be its {@code CompositeType} as returned by {@link
     * CompositeData#getCompositeType()}.  The result is true if
     * {@code this} is <em>assignable from</em> {@code ct}.  This
     * means that:</p>
     *
     * <ul>
     * <li>{@link #getTypeName() this.getTypeName()} equals
     * {@code ct.getTypeName()}, and
     * <li>there are no item names present in {@code this} that are
     * not also present in {@code ct}, and
     * <li>for every item in {@code this}, its type is assignable from
     * the type of the corresponding item in {@code ct}.
     * </ul>
     *
     * <p>A {@code TabularType} is assignable from another {@code
     * TabularType} if they have the same {@linkplain
     * TabularType#getTypeName() typeName} and {@linkplain
     * TabularType#getIndexNames() index name list}, and the
     * {@linkplain TabularType#getRowType() row type} of the first is
     * assignable from the row type of the second.
     *
     * <p>An {@code ArrayType} is assignable from another {@code
     * ArrayType} if they have the same {@linkplain
     * ArrayType#getDimension() dimension}; and both are {@linkplain
     * ArrayType#isPrimitiveArray() primitive arrays} or neither is;
     * and the {@linkplain ArrayType#getElementOpenType() element
     * type} of the first is assignable from the element type of the
     * second.
     *
     * <p>In every other case, an {@code OpenType} is assignable from
     * another {@code OpenType} only if they are equal.</p>
     *
     * <p>These rules mean that extra items can be added to a {@code
     * CompositeData} without making it invalid for a {@code CompositeType}
     * that does not have those items.</p>
     *
     * @param  obj  the value whose open type is to be tested for compatibility
     * with this <code>CompositeType</code> instance.
     *
     * @return <code>true</code> if <var>obj</var> is a value for this
     * composite type, <code>false</code> otherwise.
     */
    public boolean isValue(Object obj) {

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

        // if obj is not a CompositeData, return false
        //
        CompositeData value = (CompositeData) obj;

        // test value's CompositeType is assignable to this CompositeType instance
        //
        CompositeType valueType = value.getCompositeType();
        return this.isAssignableFrom(valueType);
    }

    
Tests whether values of the given type can be assigned to this open type. The result is true if the given type is also a CompositeType with the same name (OpenType<CompositeData>.getTypeName()), and every item in this type is also present in the given type with the same name and assignable type. There can be additional items in the given type, which are ignored. 
Params:
  • ot – the type to be tested.
Returns:true if ot is assignable to this open type.
/**
     * Tests whether values of the given type can be assigned to this
     * open type.  The result is true if the given type is also a
     * CompositeType with the same name ({@link #getTypeName()}), and
     * every item in this type is also present in the given type with
     * the same name and assignable type.  There can be additional
     * items in the given type, which are ignored.
     *
     * @param ot the type to be tested.
     *
     * @return true if {@code ot} is assignable to this open type.
     */
    @Override
    boolean isAssignableFrom(OpenType ot) {
        if (!(ot instanceof CompositeType))
            return false;
        CompositeType ct = (CompositeType) ot;
        if (!ct.getTypeName().equals(getTypeName()))
            return false;
        for (String key : keySet()) {
            OpenType<?> otItemType = ct.getType(key);
            OpenType<?> thisItemType = getType(key);
            if (otItemType == null ||
                    !thisItemType.isAssignableFrom(otItemType))
                return false;
        }
        return true;
    }


    /* *** Methods overriden from class Object *** */

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


Two CompositeType instances are equal if and only if all of the following statements are true:

    

  • their type names are equal
    • 

  • their items' names and types are equal
    • 



 

Params:
  • obj –  the object to be compared for equality with this CompositeType instance;
             if obj is null, equals returns false.
Returns: true if the specified object is equal to this CompositeType instance.
/**
     * Compares the specified <code>obj</code> parameter with this <code>CompositeType</code> instance for equality.
     * <p>
     * Two <code>CompositeType</code> instances are equal if and only if all of the following statements are true:
     * <ul>
     * <li>their type names are equal</li>
     * <li>their items' names and types are equal</li>
     * </ul>
     * <br>&nbsp;
     * @param  obj  the object to be compared for equality with this <code>CompositeType</code> instance;
     *              if <var>obj</var> is <code>null</code>, <code>equals</code> returns <code>false</code>.
     *
     * @return  <code>true</code> if the specified object is equal to this <code>CompositeType</code> instance.
     */
    public boolean equals(Object obj) {

        // if obj is null, return false
        //
        if (obj == null) {
            return false;
        }

        // if obj is not a CompositeType, return false
        //
        CompositeType other;
        try {
            other = (CompositeType) obj;
        } catch (ClassCastException e) {
            return false;
        }

        // Now, really test for equality between this CompositeType instance and the other
        //

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

        // their items names and types should be equal
        if ( ! this.nameToType.equals(other.nameToType) ) {
            return false;
        }

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

    
Returns the hash code value for this CompositeType instance.


The hash code of a CompositeType instance is the sum of the hash codes
of all elements of information used in equals comparisons
(ie: name, items names, items types).
This ensures that  t1.equals(t2)  implies that  t1.hashCode()==t2.hashCode() 
for any two CompositeType instances t1 and t2, as required by the general contract of the method Object.hashCode(). 

As CompositeType 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 CompositeType instance
/**
     * Returns the hash code value for this <code>CompositeType</code> instance.
     * <p>
     * The hash code of a <code>CompositeType</code> instance is the sum of the hash codes
     * of all elements of information used in <code>equals</code> comparisons
     * (ie: name, items names, items types).
     * This ensures that <code> t1.equals(t2) </code> implies that <code> t1.hashCode()==t2.hashCode() </code>
     * for any two <code>CompositeType</code> instances <code>t1</code> and <code>t2</code>,
     * as required by the general contract of the method
     * {@link Object#hashCode() Object.hashCode()}.
     * <p>
     * As <code>CompositeType</code> instances are immutable, the hash code for this instance is calculated once,
     * on the first call to <code>hashCode</code>, and then the same value is returned for subsequent calls.
     *
     * @return  the hash code value for this <code>CompositeType</code> instance
     */
    public int hashCode() {

        // Calculate the hash code value if it has not yet been done (ie 1st call to hashCode())
        //
        if (myHashCode == null) {
            int value = 0;
            value += this.getTypeName().hashCode();
            String key;
            for (Iterator k = nameToDescription.keySet().iterator(); k.hasNext();  ) {
                key = (String) k.next();
                value += key.hashCode();
                value += this.nameToType.get(key).hashCode();
            }
            myHashCode = new Integer(value);
        }

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

    
Returns a string representation of this CompositeType instance.


The string representation consists of
the name of this class (ie javax.management.openmbean.CompositeType), the type name for this instance,
and the list of the items names and types string representation of this instance.


As CompositeType 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 CompositeType instance
/**
     * Returns a string representation of this <code>CompositeType</code> instance.
     * <p>
     * The string representation consists of
     * the name of this class (ie <code>javax.management.openmbean.CompositeType</code>), the type name for this instance,
     * and the list of the items names and types string representation of this instance.
     * <p>
     * As <code>CompositeType</code> instances are immutable, the string representation for this instance is calculated once,
     * on the first call to <code>toString</code>, and then the same value is returned for subsequent calls.
     *
     * @return  a string representation of this <code>CompositeType</code> instance
     */
    public String toString() {

        // Calculate the string representation if it has not yet been done (ie 1st call to toString())
        //
        if (myToString == null) {
            final StringBuilder result = new StringBuilder();
            result.append(this.getClass().getName());
            result.append("(name=");
            result.append(getTypeName());
            result.append(",items=(");
            int i=0;
            Iterator k=nameToType.keySet().iterator();
            String key;
            while (k.hasNext()) {
                key = (String) k.next();
                if (i > 0) result.append(",");
                result.append("(itemName=");
                result.append(key);
                result.append(",itemType=");
                result.append(nameToType.get(key).toString() +")");
                i++;
            }
            result.append("))");
            myToString = result.toString();
        }

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

}