/*
* 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 <tt>CompositeDataSupport</tt> class is the <i>open data</i> class which
* implements the <tt>CompositeData</tt> interface.
*
*
* @since 1.5
*/
public class CompositeDataSupport
implements CompositeData, Serializable {
/* Serial version */
static final long serialVersionUID = 8003518976613702244L;
/**
* @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;
/**
* @serial The <i>composite type </i> of this <i>composite data</i> instance.
*/
private final CompositeType compositeType;
/**
* <p>Constructs a <tt>CompositeDataSupport</tt> instance with the specified
* <tt>compositeType</tt>, whose item values
* are specified by <tt>itemValues[]</tt>, in the same order as in
* <tt>itemNames[]</tt>.
* As a <tt>CompositeType</tt> does not specify any order on its items,
* the <tt>itemNames[]</tt> parameter is used
* to specify the order in which the values are given in <tt>itemValues[]</tt>.
* The items contained in this <tt>CompositeDataSupport</tt> instance are
* internally stored in a <tt>TreeMap</tt>,
* 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 <tt>itemNames</tt> must list, in any order, all the
* item names defined in <tt>compositeType</tt>; the order in which the
* names are listed, is used to match values in <tt>itemValues[]</tt>; must
* not be null or empty.
*
* @param itemValues the values of the items, listed in the same order as
* their respective names in <tt>itemNames</tt>; each item value can be
* null, but if it is non-null it must be a valid value for the open type
* defined in <tt>compositeType</tt> for the corresponding item; must be of
* the same size as <tt>itemNames</tt>; must not be null or empty.
*
* @throws IllegalArgumentException <tt>compositeType</tt> is null, or
* <tt>itemNames[]</tt> or <tt>itemValues[]</tt> is null or empty, or one
* of the elements in <tt>itemNames[]</tt> is a null or empty string, or
* <tt>itemNames[]</tt> and <tt>itemValues[]</tt> are not of the same size.
*
* @throws OpenDataException <tt>itemNames[]</tt> or
* <tt>itemValues[]</tt>'s size differs from the number of items defined in
* <tt>compositeType</tt>, or one of the elements in <tt>itemNames[]</tt>
* does not exist as an item name defined in <tt>compositeType</tt>, or one
* of the elements in <tt>itemValues[]</tt> is not a valid value for the
* corresponding item as defined in <tt>compositeType</tt>.
*/
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;
}
/**
* <p>
* Constructs a <tt>CompositeDataSupport</tt> instance with the specified <tt>compositeType</tt>, whose item names and corresponding values
* are given by the mappings in the map <tt>items</tt>.
* This constructor converts the keys to a string array and the values to an object array and calls
* <tt>CompositeDataSupport(javax.management.openmbean.CompositeType, java.lang.String[], java.lang.Object[])</tt>.
*
* @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;
* <tt>items</tt> must contain all the item names defined in <tt>compositeType</tt>;
* must not be null or empty.
*
* @throws IllegalArgumentException <tt>compositeType</tt> is null, or
* <tt>items</tt> is null or empty, or one of the keys in <tt>items</tt> is a null
* or empty string.
* @throws OpenDataException <tt>items</tt>' size differs from the
* number of items defined in <tt>compositeType</tt>, or one of the
* keys in <tt>items</tt> does not exist as an item name defined in
* <tt>compositeType</tt>, or one of the values in <tt>items</tt>
* is not a valid value for the corresponding item as defined in
* <tt>compositeType</tt>.
* @throws ArrayStoreException one or more keys in <tt>items</tt> is not of
* the class <tt>java.lang.String</tt>.
*/
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 <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 <tt>key</tt>.
*
* @throws IllegalArgumentException if <tt>key</tt> is a null or empty String.
*
* @throws InvalidKeyException if <tt>key</tt> is not an existing item name for
* this <tt>CompositeData</tt> 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
* <tt>keys</tt>, in the same order as <tt>keys</tt>.
*
* @throws IllegalArgumentException if an element in <tt>keys</tt> is a null
* or empty String.
*
* @throws InvalidKeyException if an element in <tt>keys</tt> is not an existing
* item name for this <tt>CompositeData</tt> 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 <tt>true</tt> if and only if this <tt>CompositeData</tt> instance contains
* an item whose name is <tt>key</tt>.
* If <tt>key</tt> 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 <tt>true</tt> if and only if this <tt>CompositeData</tt> instance
* contains an item
* whose value is <tt>value</tt>.
*/
public boolean containsValue(Object value) {
return contents.containsValue(value);
}
/**
* Returns an unmodifiable Collection view of the item values contained in this
* <tt>CompositeData</tt> 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 <var>obj</var> parameter with this
* <code>CompositeDataSupport</code> instance for equality.
* <p>
* Returns <tt>true</tt> 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 <tt>equals</tt> 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 <tt>java.util.Collection</tt> 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 <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 <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();
}
}