Source Code Cross Referenced for SoftHashMap.java in  » Swing-Library » substance-look-feel » org » jvnet » substance » utils » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Swing Library » substance look feel » org.jvnet.substance.utils 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 2005-2008 Substance Kirill Grouchnikov. All Rights Reserved.
003:         *
004:         * Redistribution and use in source and binary forms, with or without 
005:         * modification, are permitted provided that the following conditions are met:
006:         * 
007:         *  o Redistributions of source code must retain the above copyright notice, 
008:         *    this list of conditions and the following disclaimer. 
009:         *     
010:         *  o Redistributions in binary form must reproduce the above copyright notice, 
011:         *    this list of conditions and the following disclaimer in the documentation 
012:         *    and/or other materials provided with the distribution. 
013:         *     
014:         *  o Neither the name of Substance Kirill Grouchnikov nor the names of 
015:         *    its contributors may be used to endorse or promote products derived 
016:         *    from this software without specific prior written permission. 
017:         *     
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
020:         * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
021:         * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
022:         * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
023:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
024:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
025:         * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
026:         * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
027:         * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
028:         * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
029:         */
030:        package org.jvnet.substance.utils;
031:
032:        import java.lang.ref.*;
033:        import java.util.*;
034:        import java.io.Serializable;
035:
036:        /**
037:         * This implementation is taken from 
038:         * <a href="http://www.javaspecialists.co.za/archive/Issue098.html">The 
039:         * Java Specialists' Newsletter [Issue 098]</a> with permission of the original
040:         * author.
041:         * 
042:         * @author Dr. Heinz M. Kabutz
043:         */
044:        public class SoftHashMap<K, V> extends AbstractMap<K, V> implements 
045:                Serializable {
046:            /** The internal HashMap that will hold the SoftReference. */
047:            private final Map<K, SoftReference<V>> hash = new HashMap<K, SoftReference<V>>();
048:
049:            private final Map<SoftReference<V>, K> reverseLookup = new HashMap<SoftReference<V>, K>();
050:
051:            /** Reference queue for cleared SoftReference objects. */
052:            private final ReferenceQueue<V> queue = new ReferenceQueue<V>();
053:
054:            public V get(Object key) {
055:                expungeStaleEntries();
056:                V result = null;
057:                // We get the SoftReference represented by that key
058:                SoftReference<V> soft_ref = hash.get(key);
059:                if (soft_ref != null) {
060:                    // From the SoftReference we get the value, which can be
061:                    // null if it has been garbage collected
062:                    result = soft_ref.get();
063:                    if (result == null) {
064:                        // If the value has been garbage collected, remove the
065:                        // entry from the HashMap.
066:                        hash.remove(key);
067:                        reverseLookup.remove(soft_ref);
068:                    }
069:                }
070:                return result;
071:            }
072:
073:            private void expungeStaleEntries() {
074:                Reference<? extends V> sv;
075:                while ((sv = queue.poll()) != null) {
076:                    hash.remove(reverseLookup.remove(sv.get()));
077:                }
078:            }
079:
080:            public V put(K key, V value) {
081:                expungeStaleEntries();
082:                SoftReference<V> soft_ref = new SoftReference<V>(value, queue);
083:                reverseLookup.put(soft_ref, key);
084:                SoftReference<V> result = hash.put(key, soft_ref);
085:                if (result == null)
086:                    return null;
087:                return result.get();
088:            }
089:
090:            public V remove(Object key) {
091:                expungeStaleEntries();
092:                SoftReference<V> result = hash.remove(key);
093:                if (result == null)
094:                    return null;
095:                return result.get();
096:            }
097:
098:            public void clear() {
099:                hash.clear();
100:                reverseLookup.clear();
101:            }
102:
103:            public int size() {
104:                expungeStaleEntries();
105:                return hash.size();
106:            }
107:
108:            /**
109:             * Returns a copy of the key/values in the map at the point of
110:             * calling.  However, setValue still sets the value in the
111:             * actual SoftHashMap.
112:             */
113:            public Set<Entry<K, V>> entrySet() {
114:                expungeStaleEntries();
115:                Set<Entry<K, V>> result = new LinkedHashSet<Entry<K, V>>();
116:                for (final Entry<K, SoftReference<V>> entry : hash.entrySet()) {
117:                    final V value = entry.getValue().get();
118:                    if (value != null) {
119:                        result.add(new Entry<K, V>() {
120:                            public K getKey() {
121:                                return entry.getKey();
122:                            }
123:
124:                            public V getValue() {
125:                                return value;
126:                            }
127:
128:                            public V setValue(V v) {
129:                                entry.setValue(new SoftReference<V>(v, queue));
130:                                return value;
131:                            }
132:                        });
133:                    }
134:                }
135:                return result;
136:            }
137:        }
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