question: public void addImportValidate ( String importTableName , ImportValidator listener ) { String propertyName = importTableName + "*" ; ArrayList < ImportValidator > list = ( ArrayList < ImportValidator > ) m_impValidateListeners . get ( propertyName ) ; if ( list == null ) { list = new ArrayList < ImportValidator > ( ) ; list . add ( listener ) ; m_impValidateListeners . put ( propertyName , list ) ; } else { list . add ( listener ) ; } }
target:  Add Date Import Validation Listener