1   /*
2    *  Copyright (c) 1998-2005, The University of Sheffield.
3    *
4    *  This file is part of GATE (see http://gate.ac.uk/), and is free
5    *  software, licenced under the GNU Library General Public License,
6    *  Version 2, June 1991 (in the distribution as file licence.html,
7    *  and also available at http://gate.ac.uk/gate/licence.html).
8    *
9    *  Valentin Tablan 17/05/2002
10   *
11   *  $Id: FeatureReader.java,v 1.3 2005/01/11 13:51:32 ian Exp $
12   *
13   */
14  package gate.creole.ir;
15  
16  import gate.Document;
17  
18  /**
19   * A property reader for a document feature
20   */
21  public class FeatureReader implements PropertyReader {
22  
23    public FeatureReader(String featureName){
24      this.featureName = featureName;
25    }
26  
27    public String getPropertyValue(Document doc) {
28      if(doc.getFeatures() != null){
29        Object value = doc.getFeatures().get(featureName);
30        if(value != null) return value.toString();
31      }
32      return "";
33    }
34  
35    String featureName;
36    static final long serialVersionUID = -2831603184521440396L;
37  }