J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 3 | * |
| 4 | * This code is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License version 2 only, as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 11 | * version 2 for more details (a copy is included in the LICENSE file that |
| 12 | * accompanied this code). |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License version |
| 15 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | * |
| 18 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 19 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 20 | * have any questions. |
| 21 | */ |
| 22 | |
| 23 | /* |
| 24 | * This file is available under and governed by the GNU General Public |
| 25 | * License version 2 only, as published by the Free Software Foundation. |
| 26 | * However, the following notice accompanied the original version of this |
| 27 | * file: |
| 28 | * |
| 29 | * Written by Doug Lea with assistance from members of JCP JSR-166 |
| 30 | * Expert Group and released to the public domain, as explained at |
| 31 | * http://creativecommons.org/licenses/publicdomain |
| 32 | */ |
| 33 | import java.util.*; |
| 34 | import java.util.concurrent.*; |
| 35 | import java.util.concurrent.locks.*; |
| 36 | |
| 37 | |
| 38 | /** |
| 39 | * This is an incomplete implementation of a wrapper class |
| 40 | * that places read-write locks around unsynchronized Maps. |
| 41 | * Exists as a sample input for MapLoops test. |
| 42 | */ |
| 43 | |
| 44 | public class RWMap implements Map { |
| 45 | private final Map m; |
| 46 | private final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock(); |
| 47 | |
| 48 | public RWMap(Map m) { |
| 49 | if (m == null) |
| 50 | throw new NullPointerException(); |
| 51 | this.m = m; |
| 52 | } |
| 53 | |
| 54 | public RWMap() { |
| 55 | this(new TreeMap()); // use TreeMap by default |
| 56 | } |
| 57 | |
| 58 | public int size() { |
| 59 | rwl.readLock().lock(); try {return m.size();} finally { rwl.readLock().unlock(); } |
| 60 | } |
| 61 | public boolean isEmpty(){ |
| 62 | rwl.readLock().lock(); try {return m.isEmpty();} finally { rwl.readLock().unlock(); } |
| 63 | } |
| 64 | |
| 65 | public Object get(Object key) { |
| 66 | rwl.readLock().lock(); try {return m.get(key);} finally { rwl.readLock().unlock(); } |
| 67 | } |
| 68 | |
| 69 | public boolean containsKey(Object key) { |
| 70 | rwl.readLock().lock(); try {return m.containsKey(key);} finally { rwl.readLock().unlock(); } |
| 71 | } |
| 72 | public boolean containsValue(Object value){ |
| 73 | rwl.readLock().lock(); try {return m.containsValue(value);} finally { rwl.readLock().unlock(); } |
| 74 | } |
| 75 | |
| 76 | |
| 77 | public Set keySet() { // Not implemented |
| 78 | return null; |
| 79 | } |
| 80 | |
| 81 | public Set entrySet() { // Not implemented |
| 82 | return null; |
| 83 | } |
| 84 | |
| 85 | public Collection values() { // Not implemented |
| 86 | return null; |
| 87 | } |
| 88 | |
| 89 | public boolean equals(Object o) { |
| 90 | rwl.readLock().lock(); try {return m.equals(o);} finally { rwl.readLock().unlock(); } |
| 91 | } |
| 92 | public int hashCode() { |
| 93 | rwl.readLock().lock(); try {return m.hashCode();} finally { rwl.readLock().unlock(); } |
| 94 | } |
| 95 | public String toString() { |
| 96 | rwl.readLock().lock(); try {return m.toString();} finally { rwl.readLock().unlock(); } |
| 97 | } |
| 98 | |
| 99 | |
| 100 | |
| 101 | public Object put(Object key, Object value) { |
| 102 | rwl.writeLock().lock(); try {return m.put(key, value);} finally { rwl.writeLock().unlock(); } |
| 103 | } |
| 104 | public Object remove(Object key) { |
| 105 | rwl.writeLock().lock(); try {return m.remove(key);} finally { rwl.writeLock().unlock(); } |
| 106 | } |
| 107 | public void putAll(Map map) { |
| 108 | rwl.writeLock().lock(); try {m.putAll(map);} finally { rwl.writeLock().unlock(); } |
| 109 | } |
| 110 | public void clear() { |
| 111 | rwl.writeLock().lock(); try {m.clear();} finally { rwl.writeLock().unlock(); } |
| 112 | } |
| 113 | |
| 114 | } |