question: public static Object resolveIdentAsEnumConst ( String constant , EngineImportService engineImportService , boolean isAnnotation ) throws ExprValidationException { int lastDotIndex = constant . lastIndexOf ( '.' ) ; if ( lastDotIndex == - 1 ) { return null ; } String className = constant . substring ( 0 , lastDotIndex ) ; String constName = constant . substring ( lastDotIndex + 1 ) ; className = unescape ( className ) ; constName = unescape ( constName ) ; Class clazz ; try { clazz = engineImportService . resolveClass ( className , isAnnotation ) ; } catch ( EngineImportException e ) { return null ; } Field field ; try { field = clazz . getField ( constName ) ; } catch ( NoSuchFieldException e ) { return null ; } int modifiers = field . getModifiers ( ) ; if ( Modifier . isPublic ( modifiers ) && Modifier . isStatic ( modifiers ) ) { try { return field . get ( null ) ; } catch ( IllegalAccessException e ) { throw new ExprValidationException ( "Exception accessing field '" + field . getName ( ) + "': " + e . getMessage ( ) , e ) ; } } return null ; }
target:  Resolve a string constant as a possible enumeration value, returning null if not resolved.