1 /** 2 * Copyright 2010 The Apache Software Foundation 3 * 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 package org.apache.hadoop.hbase.util; 21 22 import java.lang.ref.ReferenceQueue; 23 import java.lang.ref.SoftReference; 24 import java.util.Map; 25 26 /** 27 * A SoftReference derivative so that we can track down what keys to remove. 28 */ 29 class SoftValue<K, V> extends SoftReference<V> implements Map.Entry<K, V> { 30 private final K key; 31 32 @SuppressWarnings("unchecked") 33 SoftValue(K key, V value, ReferenceQueue queue) { 34 super(value, queue); 35 this.key = key; 36 } 37 38 public K getKey() { 39 return this.key; 40 } 41 42 public V getValue() { 43 return get(); 44 } 45 46 public V setValue(V value) { 47 throw new RuntimeException("Not implemented"); 48 } 49 }