01: /**
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * 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: */package org.apache.geronimo.console.infomanager;
17:
18: import java.util.TreeMap;
19: import java.util.Map;
20:
21: /**
22: * A Map that can remove items as they are accessed, which makes it
23: * easier to show a list of the remaining items.
24: *
25: * @version $Rev: 476061 $ $Date: 2006-11-16 22:36:50 -0800 (Thu, 16 Nov 2006) $
26: */
27: public class ShrinkingMap extends TreeMap {
28: private boolean shrinking = false;
29:
30: public ShrinkingMap() {
31: }
32:
33: public ShrinkingMap(Map defaults) {
34: super (defaults);
35: }
36:
37: public boolean isShrinking() {
38: return shrinking;
39: }
40:
41: public void setShrinking(boolean shrinking) {
42: this .shrinking = shrinking;
43: }
44:
45: public synchronized Object get(Object key) {
46: if (shrinking) {
47: return super .remove(key);
48: } else {
49: return super .get(key);
50: }
51: }
52:
53: public Map getRemainingItems() {
54: shrinking = false;
55: return this;
56: }
57: }
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