/* * validate and setup resultExprStr */ private void validateAndSetupResultExprStr( MatchPath evaluator, List<PTFExpressionDef> args, int argsNum) throws SemanticException { PTFExpressionDef resultExprArg = args.get(argsNum - 1); ObjectInspector resultExprArgOI = resultExprArg.getOI(); if (!ObjectInspectorUtils.isConstantObjectInspector(resultExprArgOI) || (resultExprArgOI.getCategory() != ObjectInspector.Category.PRIMITIVE) || ((PrimitiveObjectInspector) resultExprArgOI).getPrimitiveCategory() != PrimitiveObjectInspector.PrimitiveCategory.STRING) { throwErrorWithSignature("Currently the result Expr parameter must be a Constant String."); } evaluator.resultExprStr = ((ConstantObjectInspector) resultExprArgOI).getWritableConstantValue().toString(); }