Input port and output port variables.

Access input and output port data as a variable by using the name of the port as the name of the variable. For example, if “in_int” is an Integer input port, you can access the data for this port by referring as a variable “in_int” with the Java primitive datatype int. You do not need to declare input and output ports as variables.

Do not assign a value to an input port variable. If you assign a value to an input variable in the On Input Row tab, you cannot get the input data for the corresponding port in the current row.

Instance variables and user-defined methods.

Use any instance or static variable or user-defined method you declared in the Helper Code tab.

For example, an active Java transformation has two input ports, BASE_SALARY and BONUSES, with an integer datatype, and a single output port, TOTAL_COMP, with an integer datatype. You create a user-defined method in the Helper Code tab, myTXAdd, that adds two integers and returns the result. Use the following Java code in the On Input Row tab to assign the total values for the input ports to the output port and generate an output row:

When the Java transformation receives an input row, it adds the values of the BASE_SALARY and BONUSES input ports, assigns the value to the TOTAL_COMP output port, and generates an output row.

Java transformation API methods.

You can call API methods provided by the Java transformation.