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Java > Open Source Codes > org > netbeans > modules > java > source > engine > TreeFinder


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.source.engine;
21
22 import com.sun.source.tree.*;
23 import com.sun.source.util.TreeScanner;
24
25 /**
26  * Finds a specified tree and then stops scanning.
27  */
28 public class TreeFinder extends TreeScanner<Boolean JavaDoc,Object JavaDoc> {
29     protected Tree target;
30     protected boolean found = false;
31
32     /**
33      * Create a new TreeFinder.
34      *
35      * @param target the tree to be found.
36      */
37     public TreeFinder(Tree target) {
38         this.target = target;
39     }
40
41     /**
42      * Scan a tree for a previously specified target.
43      *
44      * @param tree the tree to search, such as the root tree.
45      * @param o an ignored parameter, specified by the TreeVisitor interface.
46      */
47     public Boolean JavaDoc scan(Tree tree, Object JavaDoc o) {
48         found = found || tree == target;
49         if (!found && tree != null)
50             tree.accept(this, o);
51         return found;
52     }
53
54     /**
55      * Scan a list of trees for a previously specified target.
56      *
57      * @param trees the list to search.
58      * @param o an ignored parameter, specified by the TreeVisitor interface.
59      */
60     public Boolean JavaDoc scan(Iterable JavaDoc<? extends Tree> trees, Object JavaDoc o) {
61         if (!found && trees != null)
62             for (Tree tree : trees)
63                 if (scan(tree, o))
64                     return true;
65         return found;
66     }
67 }
68
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