/* Copyright 2004 The Apache Software Foundation | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
*/ | |
package org.apache.xmlbeans.impl.common; | |
import java.util.HashMap; | |
import java.lang.ref.SoftReference; | |
/** | |
* @author Cezar Andrei (cezar.andrei at bea.com) | |
* Date: Apr 26, 2005 | |
*/ | |
public class SoftCache | |
{ | |
private HashMap map = new HashMap(); | |
public Object get(Object key) | |
{ | |
SoftReference softRef = (SoftReference)map.get(key); | |
if (softRef==null) | |
return null; | |
return softRef.get(); | |
} | |
public Object put(Object key, Object value) | |
{ | |
SoftReference softRef = (SoftReference)map.put(key, new SoftReference(value)); | |
if (softRef==null) | |
return null; | |
Object oldValue = softRef.get(); | |
softRef.clear(); | |
return oldValue; | |
} | |
public Object remove(Object key) | |
{ | |
SoftReference softRef = (SoftReference)map.remove(key); | |
if (softRef==null) | |
return null; | |
Object oldValue = softRef.get(); | |
softRef.clear(); | |
return oldValue; | |
} | |
} |