Developer Transformation Guide

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Invoking an Expression with the Advanced Interface

You can define, invoke, and get the result of an expression by using the advanced interface.

On the

Helpers

On Input

code entry tab, create an instance of JExprParamMetadata class for each

argument

for the expression and set the value of the metadata. Optionally, you can instantiate the JExprParamMetadata object in the defineJExpression method.

Use the defineJExpression method to get the JExpression object for the expression.

On the appropriate code entry tab, invoke the expression with the invokeJExpression method.

Check the result of the return value with the isResultNull method.

You can get the datatype of the return value or the metadata of the return value with the getResultDataType and getResultMetadata methods.

Get the result of the expression by using the appropriate API method. You can use the getInt, getDouble, getStringBuffer, and getBytes methods.