?? indexhashmap.java
字號(hào):
?/*
* Copyright 2006-2007 original author or authors.
*
* 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.ecside.common;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
/**
* @author Wei Zijun
*
*/
public class IndexHashMap extends HashMap {
private static final long serialVersionUID = -5156437706039907818L;
private List list=new ArrayList();
public Object put(Object key, Object value) {
if (!containsKey(key)){
list.add(key);
}
return super.put(key, value);
}
public Object get(int idx){
return super.get(getKey(idx));
}
public int getIndex(Object key){
return list.indexOf(key);
}
public Object getKey(int idx){
if (idx>=list.size()) return null;
return list.get(idx);
}
public void remove(int idx){
Object key=getKey(idx);
removeFromList(getIndex(key));
super.remove(key);
}
public Object remove(Object key) {
removeFromList(getIndex(key));
return super.remove(key);
}
public void clear() {
this.list = new ArrayList();
super.clear();
}
private void removeFromList(int idx){
if (idx<list.size() && idx>=0) {
list.remove(idx);
}
}
}
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