Developer Transformation Guide

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Expression Function Types

You can create expressions for a Java transformation

by using the

Define Function

dialog box

or by using the simple or advanced interface.

You can enter expressions that use input or output port variables or variables in the Java code as input parameters.

If you use the

Define Function

dialog box, you can validate the expression before you use it in a Java transformation.

You can invoke the following types of expression functions in a Java transformation:

Expression Function Type	Description
Transformation language functions	SQL-like functions designed to handle common expressions.
User-defined functions	Functions that you create in the Developer tool based on transformation language functions.
Custom functions	Functions that you create with the Custom Function API.

You can also use unconnected transformations

and

built-in variables in expressions. For example, you can use an unconnected lookup transformation in an expression.