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27*cdf0e10cSrcweir 
28*cdf0e10cSrcweir /** base class for components validating the content of form controls
29*cdf0e10cSrcweir  *
30*cdf0e10cSrcweir  * @author  fs@openoffice.org
31*cdf0e10cSrcweir  */
32*cdf0e10cSrcweir public abstract class ControlValidator implements com.sun.star.form.validation.XValidator
33*cdf0e10cSrcweir {
34*cdf0e10cSrcweir 
35*cdf0e10cSrcweir     /** Creates a new instance of ControlValidator */
36*cdf0e10cSrcweir     public ControlValidator()
37*cdf0e10cSrcweir     {
38*cdf0e10cSrcweir     }
39*cdf0e10cSrcweir 
40*cdf0e10cSrcweir     public void addValidityConstraintListener(com.sun.star.form.validation.XValidityConstraintListener xValidityConstraintListener)
41*cdf0e10cSrcweir     {
42*cdf0e10cSrcweir     }
43*cdf0e10cSrcweir 
44*cdf0e10cSrcweir     public void removeValidityConstraintListener(com.sun.star.form.validation.XValidityConstraintListener xValidityConstraintListener)
45*cdf0e10cSrcweir     {
46*cdf0e10cSrcweir     }
47*cdf0e10cSrcweir 
48*cdf0e10cSrcweir     protected boolean isVoid( Object Value )
49*cdf0e10cSrcweir     {
50*cdf0e10cSrcweir         try
51*cdf0e10cSrcweir         {
52*cdf0e10cSrcweir             return ( com.sun.star.uno.AnyConverter.getType(Value).getTypeClass()
53*cdf0e10cSrcweir                      == com.sun.star.uno.TypeClass.VOID );
54*cdf0e10cSrcweir         }
55*cdf0e10cSrcweir         catch( java.lang.ClassCastException e )
56*cdf0e10cSrcweir         {
57*cdf0e10cSrcweir         }
58*cdf0e10cSrcweir         return false;
59*cdf0e10cSrcweir     }
60*cdf0e10cSrcweir }
61