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1 /*
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2 Copyright (c) 2008 Franklin Schmidt <fschmidt@gmail.com>
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3
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4 Permission is hereby granted, free of charge, to any person obtaining a copy
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5 of this software and associated documentation files (the "Software"), to deal
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6 in the Software without restriction, including without limitation the rights
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7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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8 copies of the Software, and to permit persons to whom the Software is
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9 furnished to do so, subject to the following conditions:
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10
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11 The above copyright notice and this permission notice shall be included in
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12 all copies or substantial portions of the Software.
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13
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14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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20 THE SOFTWARE.
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21 */
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22
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23 package fschmidt.db.util;
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24
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25 import java.lang.ref.ReferenceQueue;
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26 import java.lang.ref.SoftReference;
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27
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28
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29 public final class SoftCacheMap<K,V> extends CacheMap<K,V> {
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30
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31 static final class MySoftReference<K,V> extends SoftReference<V> implements MyReference<K,V> {
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32 private final K key;
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33
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34 MySoftReference(K key,V value,ReferenceQueue<V> q) {
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35 super(value,q);
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36 this.key = key;
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37 }
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38
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39 public K key() {
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40 return key;
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41 }
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42
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43 public boolean equals(Object obj) {
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44 Object o = this.get();
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45 if( o==null )
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46 return false;
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47 SoftReference ref = (SoftReference)obj;
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48 return o.equals(ref.get());
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49 }
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50
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51 }
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52
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53 protected MyReference<K,V> newReference(K key,V value,ReferenceQueue<V> q) {
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54 return new MySoftReference<K,V>(key,value,q);
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55 }
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56
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57 }
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