KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > edu > rice > cs > drjava > model > definitions > indent > QuestionCurrLineStartsWith


1 /*BEGIN_COPYRIGHT_BLOCK
2  *
3  * This file is part of DrJava. Download the current version of this project from http://www.drjava.org/
4  * or http://sourceforge.net/projects/drjava/
5  *
6  * DrJava Open Source License
7  *
8  * Copyright (C) 2001-2006 JavaPLT group at Rice University (javaplt@rice.edu). All rights reserved.
9  *
10  * Developed by: Java Programming Languages Team, Rice University, http://www.cs.rice.edu/~javaplt/
11  *
12  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
13  * documentation files (the "Software"), to deal with the Software without restriction, including without limitation
14  * the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and
15  * to permit persons to whom the Software is furnished to do so, subject to the following conditions:
16  *
17  * - Redistributions of source code must retain the above copyright notice, this list of conditions and the
18  * following disclaimers.
19  * - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
20  * following disclaimers in the documentation and/or other materials provided with the distribution.
21  * - Neither the names of DrJava, the JavaPLT, Rice University, nor the names of its contributors may be used to
22  * endorse or promote products derived from this Software without specific prior written permission.
23  * - Products derived from this software may not be called "DrJava" nor use the term "DrJava" as part of their
24  * names without prior written permission from the JavaPLT group. For permission, write to javaplt@rice.edu.
25  *
26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
27  * THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
28  * CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
29  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
30  * WITH THE SOFTWARE.
31  *
32  *END_COPYRIGHT_BLOCK*/
33
34 package edu.rice.cs.drjava.model.definitions.indent;
35
36 import javax.swing.text.*;
37 import edu.rice.cs.util.UnexpectedException;
38
39 import edu.rice.cs.drjava.model.AbstractDJDocument;
40
41 /** Question rule in the indentation decision tree. Determines if the current line starts with the specified
42  * string.
43  * @version $Id: QuestionCurrLineStartsWith.java 3901 2006-06-30 05:28:11Z rcartwright $
44  */
45 public class QuestionCurrLineStartsWith extends IndentRuleQuestion {
46   private String JavaDoc _prefix;
47   
48   /** Constructs a new rule for the given prefix string. Does not look inside comments.
49    * @param prefix String to search for
50    * @param yesRule Rule to use if this rule holds
51    * @param noRule Rule to use if this rule does not hold
52    */
53   public QuestionCurrLineStartsWith(String JavaDoc prefix, IndentRule yesRule, IndentRule noRule) {
54     super(yesRule, noRule);
55     _prefix = prefix;
56   }
57    
58   /** Determines if the current line in the document starts with the specified prefix, ignoring whitespace.
59    * @param doc AbstractDJDocument containing the line to be indented.
60    * @return true if this node's rule holds.
61    */
62   boolean applyRule(AbstractDJDocument doc, int reason) {
63
64       try {
65       // Find start of line
66 int here = doc.getCurrentLocation();
67       int firstCharPos = doc.getLineFirstCharPos(here);
68       int lineEndPos = doc.getLineEndPos(here);
69
70       // If prefix would run off the end of the line, the answer is obvious.
71 if (firstCharPos + _prefix.length() > lineEndPos) {
72         return false;
73       }
74       
75       // Compare prefix
76 String JavaDoc actualPrefix = doc.getText(firstCharPos, _prefix.length());
77       return _prefix.equals(actualPrefix);
78     }
79     catch (BadLocationException e) {
80       // Shouldn't happen
81 throw new UnexpectedException(e);
82     }
83   }
84 }
85
Popular Tags