Mercurial > hg > blitz_stable

annotate src/com/go/trove/util/WrappedCache.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /* ====================================================================
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2 * Trove - Copyright (c) 1997-2001 Walt Disney Internet Group
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3 * ====================================================================
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4 * The Tea Software License, Version 1.1
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5 *
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6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions
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10 * are met:
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11 *
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12 * 1. Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 *
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15 * 2. Redistributions in binary form must reproduce the above copyright
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16 * notice, this list of conditions and the following disclaimer in
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17 * the documentation and/or other materials provided with the
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18 * distribution.
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19 *
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20 * 3. The end-user documentation included with the redistribution,
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21 * if any, must include the following acknowledgment:
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22 * "This product includes software developed by the
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23 * Walt Disney Internet Group (http://opensource.go.com/)."
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24 * Alternately, this acknowledgment may appear in the software itself,
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25 * if and wherever such third-party acknowledgments normally appear.
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26 *
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27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
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28 * not be used to endorse or promote products derived from this
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29 * software without prior written permission. For written
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30 * permission, please contact opensource@dig.com.
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31 *
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32 * 5. Products derived from this software may not be called "Tea",
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33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
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34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
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35 * written permission of the Walt Disney Internet Group.
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36 *
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37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
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41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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48 * ====================================================================
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49 *
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50 * For more information about Tea, please see http://opensource.go.com/.
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51 */
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52
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53 package com.go.trove.util;
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54
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55 import java.util.*;
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56
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57 /******************************************************************************
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58 * A Map that implements a write-through cache to another map. Two maps are
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59 * supplied: one for caching and one for main storage. WrappedCache is not
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60 * thread-safe and must be wrapped with Collections.synchronizedMap to be made
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61 * thread-safe.
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62 *
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63 * @author Brian S O'Neill
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64 * @version
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65 * <!--$$Revision:--> 2 <!-- $-->, <!--$$JustDate:--> 01/07/31 <!-- $-->
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66 */
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67 public class WrappedCache extends AbstractMap implements Map {
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68 private final Map mCacheMap;
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69 private final Map mBackingMap;
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70
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71 /**
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72 * @param cacheMap the cache map should offer fast access, but it should
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73 * automatically limit its maximum size
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74 * @param backingMap the backingMap will be read from only if the requested
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75 * entry isn't in the cache
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76 */
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77 public WrappedCache(Map cacheMap, Map backingMap) {
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78 mCacheMap = cacheMap;
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79 mBackingMap = backingMap;
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80 }
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81
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82 /**
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83 * Returns the size of the backing map.
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84 */
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85 public int size() {
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86 return mBackingMap.size();
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87 }
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88
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89 /**
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90 * Returns the empty status of the backing map.
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91 */
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92 public boolean isEmpty() {
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93 return mBackingMap.isEmpty();
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94 }
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95
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96 /**
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97 * Returns true if the cache contains the key or else if the backing map
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98 * contains the key.
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99 */
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100 public boolean containsKey(Object key) {
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101 return mCacheMap.containsKey(key) || mBackingMap.containsKey(key);
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102 }
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103
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104 /**
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105 * Returns true if the cache contains the value or else if the backing map
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106 * contains the value.
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107 */
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108 public boolean containsValue(Object value) {
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109 return mCacheMap.containsValue(value) ||
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110 mBackingMap.containsValue(value);
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111 }
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112
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113 /**
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114 * Returns the value from the cache, or if not found, the backing map.
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115 * If the backing map is accessed, the value is saved in the cache for
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116 * future gets.
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117 */
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118 public Object get(Object key) {
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119 Object value = mCacheMap.get(key);
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120 if (value != null || mCacheMap.containsKey(key)) {
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121 return value;
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122 }
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123 value = mBackingMap.get(key);
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124 if (value != null || mBackingMap.containsKey(key)) {
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125 mCacheMap.put(key, value);
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126 }
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127 return value;
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128 }
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129
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130 /**
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131 * Puts the entry into both the cache and backing map. The old value in
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132 * the backing map is returned.
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133 */
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134 public Object put(Object key, Object value) {
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135 mCacheMap.put(key, value);
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136 return mBackingMap.put(key, value);
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137 }
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138
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139 /**
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140 * Removes the key from both the cache and backing map. The old value in
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141 * the backing map is returned.
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142 */
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143 public Object remove(Object key) {
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144 mCacheMap.remove(key);
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145 return mBackingMap.remove(key);
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146 }
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147
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148 /**
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149 * Clears both the cache and backing map.
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150 */
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151 public void clear() {
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152 mCacheMap.clear();
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153 mBackingMap.clear();
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154 }
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155
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156 /**
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157 * Returns the key set of the backing map.
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158 */
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159 public Set keySet() {
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160 return mBackingMap.keySet();
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161 }
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162
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163 /**
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164 * Returns the values of the backing map.
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165 */
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166 public Collection values() {
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167 return mBackingMap.values();
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168 }
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169
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170 /**
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171 * Returns the entry set of the backing map.
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172 */
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173 public Set entrySet() {
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174 return mBackingMap.entrySet();
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175 }
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176 }