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Java > Open Source Codes > org > netbeans > api > java > source > gen > TreeChecker


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.api.java.source.gen;
21
22 import com.sun.source.tree.Tree;
23 import java.util.Collections JavaDoc;
24 import java.util.HashMap JavaDoc;
25 import java.util.Map JavaDoc;
26 import org.netbeans.api.java.lexer.JavaTokenId;
27 import org.netbeans.api.lexer.TokenHierarchy;
28 import org.netbeans.api.lexer.TokenSequence;
29 import org.netbeans.api.lexer.TokenUtilities;
30
31 /**
32  * Utility class for tree comparison.
33  *
34  * @author Pavel Flaska
35  */
36 public class TreeChecker {
37
38     /** Creates a new instance of TreeChecker */
39     private TreeChecker() {
40     }
41
42     static boolean compareTrees(Tree firstTree, Tree secondTree) {
43         return true;
44     }
45     
46     static Map JavaDoc<Object JavaDoc, CharSequence JavaDoc[]> compareTokens(TokenHierarchy hierarchy0, TokenHierarchy hierarchy1) {
47         Map JavaDoc result = new HashMap JavaDoc<Integer JavaDoc, String JavaDoc[]>();
48         TokenSequence ts0 = hierarchy0.tokenSequence(JavaTokenId.language());
49         TokenSequence ts1 = hierarchy1.tokenSequence(JavaTokenId.language());
50         while (ts0.moveNext()) {
51             if (ts1.moveNext()) {
52                 if (!TokenUtilities.equals(ts0.token().text(), ts1.token().text())) {
53                    result.put(ts0.token().id(), new CharSequence JavaDoc[] { ts0.token().text(), ts1.token().text() });
54                 }
55             }
56         }
57         if (result.size() > 0) {
58            return result;
59         } else {
60            return Collections.EMPTY_MAP;
61         }
62     }
63 }
64
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