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
|
/*
* $Id: Flag.java,v 1.2 2007/12/20 18:33:33 rbair Exp $
*
* Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
* Santa Clara, California 95054, U.S.A. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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 for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.sun.pdfview;
/**
* A generic synchronized flag, because Java doesn't have one.
*/
public class Flag {
private boolean isSet;
/**
* Sets the flag. Any pending waitForFlag calls will now return.
*/
public synchronized void set() {
isSet= true;
notifyAll();
}
/**
* Clears the flag. Do this before calling waitForFlag.
*/
public synchronized void clear() {
isSet= false;
}
/**
* Waits for the flag to be set, if it is not set already.
* This method catches InterruptedExceptions, so if you want
* notification of interruptions, use interruptibleWaitForFlag
* instead.
*/
public synchronized void waitForFlag() {
if (!isSet) {
try {
wait();
} catch (InterruptedException ie) {}
}
}
/**
* Waits for the flag to be set, if it is not set already.
*/
public synchronized void interruptibleWaitForFlag()
throws InterruptedException
{
if (!isSet) {
wait();
}
}
}
|
