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


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33
34 package edu.rice.cs.drjava.model.definitions.indent;
35
36 import javax.swing.text.*;
37
38 import edu.rice.cs.drjava.model.AbstractDJDocument;
39
40 import edu.rice.cs.util.UnexpectedException;
41
42 /** @version $Id: QuestionCurrLineEmptyOrEnterPress.java 3901 2006-06-30 05:28:11Z rcartwright $
43   * Asks whether the current line is empty (contains only whitespace), or indentation was
44   * spawned by pressing enter
45   */
46 class QuestionCurrLineEmpty extends IndentRuleQuestion {
47   
48   QuestionCurrLineEmpty(IndentRule yesRule, IndentRule noRule) { super(yesRule, noRule); }
49
50   /** Determines if the current line in the document is empty.
51     * @param doc AbstractDJDocument containing the line to be indented.
52     * @return true if this node's rule holds.
53     */
54   boolean applyRule(AbstractDJDocument doc, int reason) {
55     try {
56       // Determine if there are only whitespace chars by seeing if the first non-WS char is the endOfLine
57 int here = doc.getCurrentLocation();
58       int endOfLine = doc.getLineEndPos(here);
59       int firstNonWS = doc.getLineFirstCharPos(here);
60       return (endOfLine == firstNonWS);
61     }
62     catch (BadLocationException e) {
63       // Shouldn't happen
64 throw new UnexpectedException(e);
65     }
66   }
67 }
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