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/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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5506
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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2
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*/
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/*
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* This file is available under and governed by the GNU General Public
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* License version 2 only, as published by the Free Software Foundation.
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* However, the following notice accompanied the original version of this
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* file:
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*
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* Written by Doug Lea with assistance from members of JCP JSR-166
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* Expert Group and released to the public domain, as explained at
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* http://creativecommons.org/licenses/publicdomain
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*/
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4110
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2
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import java.util.*;
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import java.util.concurrent.*;
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import java.util.concurrent.locks.*;
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/**
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* This is an incomplete implementation of a wrapper class
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* that places read-write locks around unsynchronized Maps.
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* Exists as a sample input for MapLoops test.
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*/
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public class RWMap implements Map {
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private final Map m;
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private final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock();
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public RWMap(Map m) {
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if (m == null)
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throw new NullPointerException();
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this.m = m;
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}
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public RWMap() {
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this(new TreeMap()); // use TreeMap by default
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}
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public int size() {
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rwl.readLock().lock();
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try { return m.size(); }
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finally { rwl.readLock().unlock(); }
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}
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public boolean isEmpty() {
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rwl.readLock().lock();
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try { return m.isEmpty(); }
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finally { rwl.readLock().unlock(); }
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}
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public Object get(Object key) {
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rwl.readLock().lock();
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try { return m.get(key); }
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finally { rwl.readLock().unlock(); }
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}
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public boolean containsKey(Object key) {
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rwl.readLock().lock();
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try { return m.containsKey(key); }
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finally { rwl.readLock().unlock(); }
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}
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public boolean containsValue(Object value) {
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rwl.readLock().lock();
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try { return m.containsValue(value); }
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finally { rwl.readLock().unlock(); }
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}
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public Set keySet() { // Not implemented
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return null;
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}
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public Set entrySet() { // Not implemented
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return null;
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}
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public Collection values() { // Not implemented
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return null;
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}
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public boolean equals(Object o) {
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rwl.readLock().lock();
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try { return m.equals(o); }
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finally { rwl.readLock().unlock(); }
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}
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public int hashCode() {
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rwl.readLock().lock();
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try { return m.hashCode(); }
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finally { rwl.readLock().unlock(); }
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}
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public String toString() {
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rwl.readLock().lock();
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try { return m.toString(); }
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finally { rwl.readLock().unlock(); }
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}
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public Object put(Object key, Object value) {
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rwl.writeLock().lock();
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try { return m.put(key, value); }
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finally { rwl.writeLock().unlock(); }
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}
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public Object remove(Object key) {
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rwl.writeLock().lock();
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try { return m.remove(key); }
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finally { rwl.writeLock().unlock(); }
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}
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public void putAll(Map map) {
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rwl.writeLock().lock();
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try { m.putAll(map); }
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finally { rwl.writeLock().unlock(); }
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}
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public void clear() {
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rwl.writeLock().lock();
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try { m.clear(); }
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finally { rwl.writeLock().unlock(); }
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}
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}
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