public ResultAndMessage allowPredicatePush(boolean ignoreOrderOfOp) {
	// To Enable PredicatePushOptimization, this function should return true
	//return new ResultAndMessage(true, "");
	return new ResultAndMessage(false, "Predicate Push Optimization Is Not Supported");	
}

public boolean canGenerateOutputFieldEvalError() {
	// If this Java transformation can never generate an output field evaluation error, 
	// return false.
	return true;
}

public InfaExpression getInputExpr(TransformationField field,
		TransformationDataInterface group) {
	// This should return an Informatica expression for output fields in terms of input fields
	// We will only push predicate that use fields for which input expressions are defined.
	// For example, if you have two input fields in0 and in1 and three output fields out0, out1, out2
	// out0 is the pass-through of in1, out2 is sum of in1 and in2, and out3 is unknown, the code should be:
	//if (field.getName().equals("out0"))
	//  return new InfaExpression("in0", instance);
	//else if (field.getName().equals("out1"))
	//	return new InfaExpression("in0 + in1", instance);
	//else if (field.getName().equals("out2"))
	//	return null;
	return null;
}

if (field.getName().equals("out0"))
     return new InfaExpression("in0 + 5", instance); 
else if (field.getName().equals("out2"))
     return null;

public List<TransformationDataInterface> inputGroupsPushPredicateTo(
		List<TransformationField> fields) {
	// This functions returns a list of input data interfaces to push predicates to.
	// Since JavaTx only has one input data interface, you should not have to modify this function
	AbstractTransformation tx = instance.getTransformation();
	List<DataInterface> dis = tx.getDataInterfaces();
	List<TransformationDataInterface> inputDIs = new ArrayList<TransformationDataInterface>();
	for (DataInterface di : dis){
		TransformationDataInterface tdi = (TransformationDataInterface) di;
		if (tdi.isInput())
			inputDIs.add(tdi);
	}
	if(inputDIs.size() == 1)
		return inputDIs;
	else
		return null;
}