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Java > Open Source Codes > org > apache > geronimo > console > infomanager > ShrinkingMap


1 /**
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 package org.apache.geronimo.console.infomanager;
18
19 import java.util.TreeMap JavaDoc;
20 import java.util.Map JavaDoc;
21
22 /**
23  * A Map that can remove items as they are accessed, which makes it
24  * easier to show a list of the remaining items.
25  *
26  * @version $Rev: 476061 $ $Date: 2006-11-17 01:36:50 -0500 (Fri, 17 Nov 2006) $
27  */
28 public class ShrinkingMap extends TreeMap JavaDoc {
29     private boolean shrinking = false;
30
31     public ShrinkingMap() {
32     }
33
34     public ShrinkingMap(Map JavaDoc defaults) {
35         super(defaults);
36     }
37
38     public boolean isShrinking() {
39         return shrinking;
40     }
41
42     public void setShrinking(boolean shrinking) {
43         this.shrinking = shrinking;
44     }
45
46     public synchronized Object JavaDoc get(Object JavaDoc key) {
47         if(shrinking) {
48             return super.remove(key);
49         } else {
50             return super.get(key);
51         }
52     }
53
54     public Map JavaDoc getRemainingItems() {
55         shrinking = false;
56         return this;
57     }
58 }
59
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