| /******************************************************************************* |
| * 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; |
| /* |
| * $RCSfile: IdentityMap.java,v $ |
| * $Revision: 1.4 $ $Date: 2005/08/24 20:39:08 $ |
| */ |
| |
| |
| 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(); |
| } |
| } |