UniqueFilter


1   package net.suberic.util.gui.propedit;
2   import net.suberic.util.VariableBundle;
3   
4   import java.util.List  ;
5   
6   /**
7    * A PropertyEditorListener which disallows entries which already exist
8    * for a particular property.
9    *
10   */
11  public class UniqueFilter extends PropertyEditorAdapter implements ConfigurablePropertyEditorListener {
12    String   parentProperty;
13    PropertyEditorManager manager;
14  
15    /**
16     * Configures this filter from the given key.
17     */
18    public void configureListener(String   key, String   property, String   propertyBase, String   editorTemplate, PropertyEditorManager pManager) {
19  
20      String   parentProp = pManager.getProperty(key + ".listProperty", "");
21      if (parentProp.length() > 0) {
22        if (parentProp.startsWith(".")) {
23          parentProperty=propertyBase + parentProp;
24        } else {
25          parentProperty=parentProp;
26        }
27      }
28  
29      manager = pManager;
30  
31    }
32  
33    /**
34     * Called when a property is about to change.  If the value is not ok
35     * with the listener, a PropertyValueVetoException should be thrown.
36     *
37     * In this case, if the entry already exists in the parentProperty we
38     * throw an Exception.
39     */
40    public void propertyChanging(PropertyEditorUI source, String   property, String   newValue) throws PropertyValueVetoException {
41      String   parentValue = manager.getCurrentProperty(parentProperty, "");
42      List  <String  > parentValueList = VariableBundle.convertToList(parentValue);
43      if (parentValueList.contains(newValue)) {
44        throw new PropertyValueVetoException(property, newValue, manager.formatMessage("Message.uniquFilter.notUnique", newValue, parentProperty), this);
45      }
46    }
47  
48  }
49
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