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/** base class for components validating the content of form controls
 *
 * @author  fs@openoffice.org
 */
public abstract class ControlValidator implements com.sun.star.form.validation.XValidator
{

    /** Creates a new instance of ControlValidator */
    public ControlValidator()
    {
    }

    public void addValidityConstraintListener(com.sun.star.form.validation.XValidityConstraintListener xValidityConstraintListener)
    {
    }

    public void removeValidityConstraintListener(com.sun.star.form.validation.XValidityConstraintListener xValidityConstraintListener)
    {
    }

    protected boolean isVoid( Object Value )
    {
        try
        {
            return ( com.sun.star.uno.AnyConverter.getType(Value).getTypeClass()
                     == com.sun.star.uno.TypeClass.VOID );
        }
        catch( java.lang.ClassCastException e )
        {
        }
        return false;
    }
}
