1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: WeakTable.java,v $
* $Revision: 1.3 $
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
package com.sun.star.lib.sandbox;
import java.lang.reflect.Method;
import java.util.Hashtable;
import java.util.Observable;
import java.util.Observer;
public class WeakTable extends Observable {
private static final boolean DEBUG = false;
private static final void DEBUG(String dbg) {
if (DEBUG)
System.err.println(">>> com.sun.star.lib.sandbox.WeakTable - " + dbg);
}
static WeakTable weakTable = new WeakTable();
public Hashtable hash = new Hashtable();
synchronized private void pput(Object key, Cachable cachable) {
DEBUG("put:" + key + " " + cachable);
synchronized(hash) {
Object hardObject = cachable.getHardObject();
Class weakClass = cachable.getClass();
WeakRef weakRef = new WeakRef(key, hardObject);
cachable.setWeakRef(weakRef);
hash.put(key, new WeakEntry(weakClass, weakRef));
}
setChanged();
notifyObservers();
}
synchronized private Cachable pget(Object key) {
DEBUG("get:" + key);
String error = null;
Cachable cachable = null;
synchronized(hash) {
WeakEntry weakEntry = (WeakEntry)hash.get(key);
if(weakEntry != null) {
try {
// Class sig[] = new Class[1];
// sig[0] = weakRef.getClass();
// Method method = weakClass.getMethod("<init>", sig);
cachable = (Cachable)weakEntry.weakClass.newInstance();
cachable.setWeakRef(weakEntry.weakRef);
}
catch(IllegalAccessException e) {
error = "#### WeakTable.get:" + e;
}
catch(InstantiationException e) {
error = "#### WeakTable.get:" + e;
}
}
}
if(error != null)
System.err.println(error);
return cachable;
}
synchronized private void premove(Object key) {
hash.remove(key);
setChanged();
notifyObservers();
}
synchronized private void pclear() {
hash.clear();
setChanged();
notifyObservers();
}
public void addObserver(Observer observer) {
super.addObserver(observer);
observer.update(this, null);
}
public static void put(Object key, Cachable cachable) {
weakTable.pput(key, cachable);
}
public static Cachable get(Object key) {
return weakTable.pget(key);
}
public static void remove(Object key) {
weakTable.premove(key);
}
public static void AddObserver(Observer observer) {
weakTable.addObserver(observer);
}
public static void DeleteObserver(Observer observer) {
weakTable.deleteObserver(observer);
}
static void clear() {
weakTable.pclear();
}
static java.util.Enumeration elements() {
return weakTable.hash.elements();
}
}
|
