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27 
28 /** base class for components validating the content of form controls
29  *
30  * @author  fs@openoffice.org
31  */
32 public abstract class ControlValidator implements com.sun.star.form.validation.XValidator
33 {
34 
35     /** Creates a new instance of ControlValidator */
36     public ControlValidator()
37     {
38     }
39 
40     public void addValidityConstraintListener(com.sun.star.form.validation.XValidityConstraintListener xValidityConstraintListener)
41     {
42     }
43 
44     public void removeValidityConstraintListener(com.sun.star.form.validation.XValidityConstraintListener xValidityConstraintListener)
45     {
46     }
47 
48     protected boolean isVoid( Object Value )
49     {
50         try
51         {
52             return ( com.sun.star.uno.AnyConverter.getType(Value).getTypeClass()
53                      == com.sun.star.uno.TypeClass.VOID );
54         }
55         catch( java.lang.ClassCastException e )
56         {
57         }
58         return false;
59     }
60 }
61