Mercurial > hg > truffle
diff graal/com.oracle.max.base/src/com/sun/max/collect/IdentityHashMapping.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
parents | |
children | bc8527f3071c |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.max.base/src/com/sun/max/collect/IdentityHashMapping.java Sat Dec 17 19:59:18 2011 +0100 @@ -0,0 +1,92 @@ +/* + * Copyright (c) 2007, 2011, 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. + * + * 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 com.sun.max.collect; + +import java.util.*; + +/** + */ +public class IdentityHashMapping<K, V> implements Mapping<K, V> { + + private final Map<K, V> delegate; + + public IdentityHashMapping() { + delegate = new IdentityHashMap<K, V>(); + } + + public IdentityHashMapping(int expectedMaxSize) { + delegate = new IdentityHashMap<K, V>(expectedMaxSize); + } + + public synchronized V put(K key, V value) { + return delegate.put(key, value); + } + + public synchronized V get(K key) { + final V value = delegate.get(key); + return value; + } + + public synchronized boolean containsKey(K key) { + return delegate.containsKey(key); + } + + public int length() { + return delegate.size(); + } + + public void clear() { + delegate.clear(); + } + + public V remove(K key) { + return delegate.remove(key); + } + + public IterableWithLength<K> keys() { + return new IterableWithLength<K>() { + + public int size() { + return delegate.size(); + } + + public Iterator<K> iterator() { + return delegate.keySet().iterator(); + } + }; + } + + public IterableWithLength<V> values() { + return new IterableWithLength<V>() { + + public int size() { + return delegate.size(); + } + + public Iterator<V> iterator() { + return delegate.values().iterator(); + } + }; + } + +}