question: public static void registerCondition ( String conditionName , Class < ? extends AttributeFilterCondition > conditionClass ) { String [ ] newConditionNames = new String [ CONDITION_NAMES . length + 1 ] ; System . arraycopy ( CONDITION_NAMES , 0 , newConditionNames , 0 , CONDITION_NAMES . length ) ; newConditionNames [ newConditionNames . length - 1 ] = conditionName ; CONDITION_NAMES = newConditionNames ; Class < ? > [ ] newConditionClasses = new Class [ CONDITION_IMPLEMENTATIONS . length + 1 ] ; System . arraycopy ( CONDITION_IMPLEMENTATIONS , 0 , newConditionClasses , 0 , CONDITION_IMPLEMENTATIONS . length ) ; newConditionClasses [ newConditionClasses . length - 1 ] = conditionClass ; CONDITION_IMPLEMENTATIONS = newConditionClasses ; }
target:  This method allows registering filter conditions defined in plugins.