Table of Contents

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  1. Preface
  2. Transformations
  3. Source transformation
  4. Target transformation
  5. Aggregator transformation
  6. Cleanse transformation
  7. Data Masking transformation
  8. Deduplicate transformation
  9. Expression transformation
  10. Filter transformation
  11. Hierarchy Builder transformation
  12. Hierarchy Parser transformation
  13. Hierarchy Processor transformation
  14. Input transformation
  15. Java transformation
  16. Java transformation API reference
  17. Joiner transformation
  18. Labeler transformation
  19. Lookup transformation
  20. Mapplet transformation
  21. Normalizer transformation
  22. Output transformation
  23. Parse transformation
  24. Python transformation
  25. Rank transformation
  26. Router transformation
  27. Rule Specification transformation
  28. Sequence Generator transformation
  29. Sorter transformation
  30. SQL transformation
  31. Structure Parser transformation
  32. Transaction Control transformation
  33. Union transformation
  34. Velocity transformation
  35. Verifier transformation
  36. Web Services transformation

Transformations

Transformations

invokeJExpression

invokeJExpression

Invokes an expression and returns the value for the expression. Use only in an
elastic mapping
.
Use invokeJExpression in any section of the Java editor except Import Packages and Helper Code.
Use the following syntax:
(dataType)invokeJExpression(                       String expression,                       Object[] paramMetadataArray);
The following table describes the arguments:
Argument
Data Type
Input/Output
Description
dataType
-
Output
Data type that you want to cast the return value to. By default, the return data type is an object.
You can cast the return value to an integer, double, string, or byte[] data type.
expression
String
Input
String that represents the expression to invoke.
You must use the letter "x" and number the parameters consecutively. For example, if the invoked expression requires three parameters, name the parameters x1, x2, and x3.
paramMetadataArray
Object[]
Input
Array of objects that contains the input parameters for the invoked expression.
Use the following Java code to invoke the concat() method to concatenate the strings
John
and
Smith
:
(String)invokeJExpression("concat(x1,x2)", new Object [] { "John ", "Smith" });
The code returns the following string:
John Smith
Consider the following rules and guidelines for the invokeJExpression method:
  • By default, the update strategy for return values is INSERT. To use a different update strategy, you must define the update strategy in the Java code.
  • If an argument, parameter, or return value is NULL, the value is treated as a null indicator.
    For example, if the return value of the invoked expression is NULL and the return data type is a string, the invokeJExpression method returns a string with a value of NULL.
  • If an input parameter to the invoked expression is a date/time data type, you must pass the parameter as a string and use the TO_DATE function to convert the string to a date/time data type.
    For example, use the following argument to pass a date/time value to the invoked expression:
    new Object [] { "TO_DATE("01/22/98", "MM/DD/YY")" }
  • If the invokeJExpression method returns a date/time data type, you must cast the return value to a string.