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Java > Open Source Codes > org > netbeans > api > java > source > support > CancellableTreeScanner


1 /*
2  * The contents of this file are subject to the terms of the Common Development
3  * and Distribution License (the License). You may not use this file except in
4  * compliance with the License.
5  *
6  * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
7  * or http://www.netbeans.org/cddl.txt.
8  *
9  * When distributing Covered Code, include this CDDL Header Notice in each file
10  * and include the License file at http://www.netbeans.org/cddl.txt.
11  * If applicable, add the following below the CDDL Header, with the fields
12  * enclosed by brackets [] replaced by your own identifying information:
13  * "Portions Copyrighted [year] [name of copyright owner]"
14  *
15  * The Original Software is NetBeans. The Initial Developer of the Original
16  * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
17  * Microsystems, Inc. All Rights Reserved.
18  */
19 package org.netbeans.api.java.source.support;
20
21 import com.sun.source.tree.Tree;
22 import com.sun.source.util.TreeScanner;
23
24 /**
25  *
26  * @author Jan Lahoda
27  */
28 public class CancellableTreeScanner<R,P> extends TreeScanner<R,P> {
29
30     private boolean canceled;
31
32     /**
33      * Creates a new instance of CancellableTreeScanner
34      */
35     public CancellableTreeScanner() {
36     }
37
38     protected synchronized boolean isCanceled() {
39         return canceled;
40     }
41
42     public synchronized void cancel() {
43         canceled = true;
44     }
45
46     /** @inheritDoc
47      */
48     public R scan(Tree tree, P p) {
49         if (isCanceled())
50             return null;
51         
52         return super.scan(tree, p);
53     }
54
55     /** @inheritDoc
56      */
57     public R scan(Iterable JavaDoc<? extends Tree> trees, P p) {
58         if (isCanceled())
59             return null;
60         
61         return super.scan(trees, p);
62     }
63
64 }
65
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