Developer Transformation Guide

10.5.2
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Advanced Interface Example

You can use the advanced interface to create and invoke a lookup expression in a Java transformation.

The following example Java code shows how to create a function that calls an expression and how to invoke the expression to get the return value. This example passes the values for two input ports with a String datatype, NAME and COMPANY, to the function myLookup. The myLookup function uses a lookup expression to look up the value for the ADDRESS output port.

This example assumes you have an unconnected lookup transformation in the mapping called LKP_addresslookup.

Use the following Java code on the

Helpers

tab:

JExpression addressLookup()  throws SDKException
{
     JExprParamMetadata params[] = new JExprParamMetadata[2];
     params[0] = new JExprParamMetadata (
                     EDataType.STRING, 	    // data type
                     50,                   // precision
                     0                     // scale
                     );
     params[1] = new JExprParamMetadata (
                     EDataType.STRING,     // data type
                     50,                   // precision
                     0                     // scale
                     );
     return defineJExpression(":LKP.LKP_addresslookup(X1,X2)",params);
}
JExpression lookup = null;
boolean isJExprObjCreated = false;

Use the following Java code on the

On Input

tab to invoke the expression and return the value of the ADDRESS port:

...
if(!iisJExprObjCreated)
{
    lookup = addressLookup();
    isJExprObjCreated = true;
}
lookup = addressLookup();
lookup.invoke(new Object [] {NAME,COMPANY}, ERowType.INSERT);
EDataType addressDataType = lookup.getResultDataType();
if(addressDataType == EDataType.STRING)
{
    ADDRESS = (lookup.getStringBuffer()).toString();
} else {
    logError("Expression result datatype is incorrect.");
}
...

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Developer Transformation Guide

Developer Transformation Guide

Advanced Interface Example

Advanced Interface Example