question: public static void validateAttribute ( Attr attr , String validatorClass , String rule ) throws UMSException , DataConstraintException { if ( attr != null ) { String [ ] values = attr . getStringValues ( ) ; for ( int i = 0 ; i < values . length ; i ++ ) { String aValue = values [ i ] ; if ( ( aValue != null ) && ( ! aValue . equalsIgnoreCase ( "" ) ) && ( validatorClass != null ) ) { IValidator validator = null ; try { Class theClass = Class . forName ( validatorClass ) ; validator = ( IValidator ) theClass . newInstance ( ) ; } catch ( Exception e ) { throw new UMSException ( i18n . getString ( IUMSConstants . INSTANCE_FAILED ) , e ) ; } if ( ! validator . validate ( aValue , rule ) ) { String msg = i18n . getString ( IUMSConstants . DATA_CONSTRAINT ) ; throw new DataConstraintException ( msg + ": " + "{ type=" + attr . getName ( ) + ", value=" + aValue + " }" ) ; } } } } }
target:  Determines whether a specific attribute is valid. Called by validateAttribute(Attr, Class). This method calls the validation method for this attribute.