KickJava   Java API By Example, From Geeks To Geeks.

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


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 /**
42  * Question rule in the indentation decision tree. Determines if the
43  * line previous to the current position starts with the specified character.
44  * @version $Id: QuestionPrevLineStartsWith.java 3900 2006-06-29 13:16:38Z rcartwright $
45  */
46 public class QuestionPrevLineStartsWith extends IndentRuleQuestion {
47   private String JavaDoc _prefix;
48   
49   /**
50    * Constructs a new rule for the given prefix string.
51    * ALWAYS looks inside comments.
52    * @param prefix String to search for
53    * @param yesRule Rule to use if this rule holds
54    * @param noRule Rule to use if this rule does not hold
55    */
56   public QuestionPrevLineStartsWith(String JavaDoc prefix, IndentRule yesRule, IndentRule noRule) {
57     super(yesRule, noRule);
58     _prefix = prefix;
59   }
60   
61   /** Determines if the previous line in the document starts with the specified characters, ignoring whitespace.
62     * @param doc AbstractDJDocument containing the line to be indented.
63     * @return true if this node's rule holds.
64     */
65   boolean applyRule(AbstractDJDocument doc, int reason) {
66
67     try {
68       // Find start of line
69 int here = doc.getCurrentLocation();
70       int startLine = doc.getLineStartPos(here);
71       
72       if (startLine > AbstractDJDocument.DOCSTART) {
73         // Find start of previous line
74 int startPrevLine = doc.getLineStartPos(startLine - 1);
75         int firstChar = doc.getLineFirstCharPos(startPrevLine);
76         
77         // Compare prefix
78 String JavaDoc actualPrefix = doc.getText(firstChar, _prefix.length());
79         return _prefix.equals(actualPrefix);
80       }
81     }
82     catch (BadLocationException e) {
83       // Shouldn't happen
84 throw new UnexpectedException(e);
85     }
86     // On first line
87 return false;
88   }
89
90 }
91
Popular Tags