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68
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1 package fschmidt.util.java;
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2
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3 import java.util.Map;
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4
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5
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6 public final class SimpleCache<A,V> implements Computable<A,V> {
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7 private final Map<A,V> map;
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8 private final Computable<A,V> comp;
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9
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10 public SimpleCache(Map<A,V> map,Computable<A,V> comp) {
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11 this.map = map;
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12 this.comp = comp;
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13 }
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14
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15 public synchronized V get(A arg) throws ComputationException {
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16 V val = map.get(arg);
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17 if( val == null ) {
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18 try {
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19 val = comp.get(arg);
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20 } catch(RuntimeException e) {
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21 throw e;
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22 } catch(Exception e) {
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23 throw new ComputationException(e);
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24 }
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25 map.put(arg,val);
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26 }
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27 return val;
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28 }
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29
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30 public synchronized void remove(A arg) {
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31 map.remove(arg);
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32 }
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33
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34 }
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