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Java > Open Source Codes > org > netbeans > modules > java > hints > LazyHintComputation


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
20 package org.netbeans.modules.java.hints;
21 import java.util.ArrayList JavaDoc;
22 import java.util.LinkedList JavaDoc;
23 import java.util.List JavaDoc;
24 import org.netbeans.api.java.source.CancellableTask;
25 import org.netbeans.api.java.source.CompilationInfo;
26 import org.openide.filesystems.FileObject;
27
28 /**
29  *
30  * @author Jan Lahoda
31  */
32 public class LazyHintComputation implements CancellableTask<CompilationInfo> {
33     
34     private FileObject file;
35     
36     /** Creates a new instance of LazyHintComputation */
37     public LazyHintComputation(FileObject file) {
38         this.file = file;
39     }
40
41     public synchronized void cancel() {
42         cancelled = true;
43         if (delegate != null) {
44             delegate.cancel();
45         }
46     }
47
48     private synchronized void setDelegate(CreatorBasedLazyFixList delegate) {
49         this.delegate = delegate;
50     }
51     
52     private boolean cancelled;
53     private CreatorBasedLazyFixList delegate;
54     private synchronized boolean isCancelled() {
55         return cancelled;
56     }
57     
58     private synchronized void resume() {
59         cancelled = false;
60     }
61     
62     public void run(CompilationInfo info) {
63         resume();
64         
65         boolean cancelled = false;
66         
67         List JavaDoc<CreatorBasedLazyFixList> toCompute = new LinkedList JavaDoc<CreatorBasedLazyFixList>();
68         
69         try {
70             toCompute.addAll(LazyHintComputationFactory.getAndClearToCompute(file));
71             
72             if (isCancelled()) {
73                 cancelled = true;
74                 return;
75             }
76             
77             while (!toCompute.isEmpty()) {
78                 if (isCancelled()) {
79                     cancelled = true;
80                     return;
81                 }
82                 
83                 CreatorBasedLazyFixList l = toCompute.remove(0);
84                 
85                 setDelegate(l);
86                 l.compute(info);
87                 setDelegate(null);
88                 
89                 if (isCancelled()) {
90                     toCompute.add(0, l);
91                     cancelled = true;
92                     return;
93                 }
94             }
95         } finally {
96             if (cancelled && !toCompute.isEmpty()) {
97                 for (CreatorBasedLazyFixList l : toCompute) {
98                     LazyHintComputationFactory.addToCompute(file, l);
99                 }
100             }
101         }
102     }
103     
104 }
105
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