01: /***
02: * Retrotranslator: a Java bytecode transformer that translates Java classes
03: * compiled with JDK 5.0 into classes that can be run on JVM 1.4.
04: *
05: * Copyright (c) 2005 - 2008 Taras Puchko
06: * All rights reserved.
07: *
08: * Redistribution and use in source and binary forms, with or without
09: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the copyright holders nor the names of its
17: * contributors may be used to endorse or promote products derived from
18: * this software without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30: * THE POSSIBILITY OF SUCH DAMAGE.
31: */package net.sf.retrotranslator.runtime.java.lang;
32:
33: import java.util.*;
34: import net.sf.retrotranslator.registry.Advanced;
35:
36: /**
37: * @author Taras Puchko
38: */
39: @Advanced("ThreadLocal.remove")
40: public class ThreadLocal_ {
41:
42: private static class Key {
43: }
44:
45: private static class Container extends
46: ThreadLocal<Map<Key, Object>> {
47: protected Map<Key, Object> initialValue() {
48: return new WeakHashMap<Key, Object>();
49: }
50: }
51:
52: private static final Container container = new Container();
53:
54: private final Key key = new Key();
55:
56: public ThreadLocal_() {
57: }
58:
59: public Object get() {
60: Map<Key, Object> map = container.get();
61: Object value = map.get(key);
62: if (value == null && !map.containsKey(key)) {
63: map.put(key, value = initialValue());
64: }
65: return value;
66: }
67:
68: public void set(Object value) {
69: container.get().put(key, value);
70: }
71:
72: public void remove() {
73: container.get().remove(key);
74: }
75:
76: protected Object initialValue() {
77: return null;
78: }
79:
80: }
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