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


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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 3993 2006-09-02 20:23:38Z rcartwright $
43   * Asks whether the current line is empty (contains only whitespace), or indentation was
44   * spawned by pressing enter.
45   *
46   * TODO: eliminate duplicated code with QuestionCurrentLineEmpty
47   */
48 class QuestionCurrLineEmptyOrEnterPress extends IndentRuleQuestion {
49   
50   QuestionCurrLineEmptyOrEnterPress(IndentRule yesRule, IndentRule noRule) { super(yesRule, noRule); }
51
52   /** Determines if the current line in the document is empty.
53     * @param doc AbstractDJDocument containing the line to be indented.
54     * @return true if this node's rule holds.
55     */
56   boolean applyRule(AbstractDJDocument doc, int reason) {
57     if (reason == Indenter.ENTER_KEY_PRESS) return true;
58     try {
59       // Determine if there are only whitespace chars by seeing if the first non-WS char is the endOfLine
60 int here = doc.getCurrentLocation();
61       int endOfLine = doc.getLineEndPos(here);
62       int firstNonWS = doc.getLineFirstCharPos(here);
63       return (endOfLine == firstNonWS);
64     }
65     catch (BadLocationException e) {
66       // Shouldn't happen
67 throw new UnexpectedException(e);
68     }
69   }
70 }
71
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