01 /*
02 * Copyright (c) 1995-2010, The University of Sheffield. See the file
03 * COPYRIGHT.txt in the software or at http://gate.ac.uk/gate/COPYRIGHT.txt
04 *
05 * This file is part of GATE (see http://gate.ac.uk/), and is free
06 * software, licenced under the GNU Library General Public License,
07 * Version 2, June 1991 (in the distribution as file licence.html,
08 * and also available at http://gate.ac.uk/gate/licence.html).
09 *
10 * Eric Sword, 09/03/08
11 *
12 * $Id$
13 */
14 package gate.jape.constraint;
15
16 import gate.Annotation;
17 import gate.AnnotationSet;
18
19 /**
20 * Accessor that returns the length of the characters spanned by the annotation
21 *
22 * @version $Revision$
23 * @author esword
24 */
25 public class LengthAccessor extends MetaPropertyAccessor {
26
27 /**
28 * Return the length of the span of the annotation.
29 */
30 public Object getValue(Annotation annot, AnnotationSet context) {
31 if(annot == null) return 0;
32 Long retVal = annot.getEndNode().getOffset()
33 - annot.getStartNode().getOffset();
34 return retVal;
35 }
36
37 /**
38 * Always returns "length", the name of the meta-property which this
39 * accessor provides.
40 */
41 @Override
42 public Object getKey() {
43 return "length";
44 }
45 }
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