01: /**
02: * L2FProd.com Common Components 7.3 License.
03: *
04: * Copyright 2005-2007 L2FProd.com
05: *
06: * Licensed under the Apache License, Version 2.0 (the "License");
07: * you may not use this file except in compliance with the License.
08: * You may obtain a copy of the License at
09: *
10: * http://www.apache.org/licenses/LICENSE-2.0
11: *
12: * Unless required by applicable law or agreed to in writing, software
13: * distributed under the License is distributed on an "AS IS" BASIS,
14: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15: * See the License for the specific language governing permissions and
16: * limitations under the License.
17: */package com.l2fprod.common.swing;
18:
19: import java.net.URL;
20: import java.util.HashMap;
21: import java.util.Map;
22:
23: import javax.swing.Icon;
24: import javax.swing.ImageIcon;
25:
26: /**
27: * IconPool.<br>
28: *
29: */
30: public class IconPool {
31:
32: private static IconPool iconPool = new IconPool();
33:
34: private Map pool;
35:
36: public IconPool() {
37: pool = new HashMap();
38: }
39:
40: public static IconPool shared() {
41: return iconPool;
42: }
43:
44: /**
45: * Gets the icon denoted by url.
46: * If url is relative, it is relative to the caller.
47: *
48: * @param url
49: * @return an icon
50: */
51: public Icon get(String url) {
52: StackTraceElement[] stacks = new Exception().getStackTrace();
53: try {
54: Class callerClazz = Class.forName(stacks[1].getClassName());
55: return get(callerClazz.getResource(url));
56: } catch (ClassNotFoundException e) {
57: throw new RuntimeException(e);
58: }
59: }
60:
61: public synchronized Icon get(URL url) {
62: if (url == null) {
63: return null;
64: }
65:
66: Icon icon = (Icon) pool.get(url.toString());
67: if (icon == null) {
68: icon = new ImageIcon(url);
69: pool.put(url.toString(), icon);
70: }
71: return icon;
72: }
73:
74: public synchronized void clear() {
75: pool.clear();
76: }
77:
78: }
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