Transformation Guide

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Creating Java Code Snippets

To create Java code snippets to define transformation behavior, use the

Code

Java Code

window on the

Java Code

code entry

tab

Click the appropriate code entry tab.

The following table describes the tasks that you can complete on the code entry tabs in the

Java

view:

Tab	Description
Imports	Imports third-party, built-in, and custom Java packages for an active or passive Java transformation. After you import packages, you can use them on the other code entry tabs.
Helpers	Declares user-defined variables and methods for the Java transformation class in an active or passive Java transformation. After you declare variables and methods, you can use them in any other code entry tab except the Imports tab.
On Input	Defines how an active or passive Java transformation behaves when it receives an input row. The Java code that you define on this tab runs one time for each input row. On this tab, you can also access and use input and output port data, variables, and Java transformation API methods.
At End	Defines how an active or passive Java transformation behaves after it processes all input data. On this tab, you can also set output data for active transformations, and call Java transformation API methods.
Functions	Defines functions that invoke expressions in a Java transformation with the Java programming language. For example, you can define a function that invokes an expression that looks up the values of input or output ports or looks up the values of Java transformation variables. On the Functions tab, you can manually define functions or click New Function to invoke the Define Function dialog box, which enables you to easily define a function.
Optimizer Interfaces	Defines early selection or push-into filter optimization. Select the optimization method in the navigator. Update the code snippets to enable the optimization. Define the input ports and associated output ports to push filter logic through.
Full Code	Read-only. On this tab, you can view and compile the full class code for the Java transformation.

To access input or output column variables in the snippet,

double-click the name of the port in the navigator

expand the

Input

Output

list in the navigator and double-click the name of the port

To call a Java transformation API in the snippet,

double-click the name of the API in the navigator. If necessary, configure the appropriate API input values

expand the

Callable APIs

list in the navigator and double-click the name of the method. If necessary, configure the appropriate input values for the method

Write appropriate Java code, based on the

code snippet

code entry tab type

View the full class code for the Java transformation in the

Full Code

Java code

window

on the

Full Code

tab

Developing Java Code

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Table of Contents

Transformation Guide

Transformation Guide

Creating Java Code Snippets

Creating Java Code Snippets