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/*******************************************************************************
* Copyright (c) 2001, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jem.internal.proxy.vm.remote;
/*
*/
import java.util.*;
/**
* A HashMap where the key is
* done as an identity (i.e. found by '==' not equals()).
*/
public class IdentityMap extends HashMap{
/**
* Comment for <code>serialVersionUID</code>
*
* @since 1.1.0
*/
private static final long serialVersionUID = -6817274833221383683L;
/**
* Key that returns true on equals() only
* if the item it is wrappering is '=='
* not equals()
*/
static class IdentityKey {
public static IdentityKey createKey(Object obj) {
return obj != null ? new IdentityKey(obj) : null;
}
final Object o;
public IdentityKey(Object obj) {
o = obj;
}
public boolean equals(Object obj) {
if (this == obj) return true;
if (!(obj instanceof IdentityKey)) return false;
if (this.o == (((IdentityKey) obj).o)) return true;
return false;
}
public int hashCode() {
return o.hashCode();
}
}
public IdentityMap() {
}
public IdentityMap(int capacity) {
super(capacity);
}
public IdentityMap(int capacity, float loadFactor) {
super(capacity, loadFactor);
}
public boolean containsKey(Object key) {
return super.containsKey(IdentityKey.createKey(key));
}
public Object get(Object key) {
return super.get(IdentityKey.createKey(key));
}
public Object put(Object key, Object value) {
return super.put(IdentityKey.createKey(key), value);
}
public Object remove(Object key) {
return super.remove(IdentityKey.createKey(key));
}
/**
* NOTE: Didn't bother implementing entrySet(). If that becomes
* needed, then it will be implemented.
*/
public Set entrySet() {
throw new UnsupportedOperationException();
}
}
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