Table of Contents

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  1. Preface
  2. Introduction to Transformations
  3. Transformation Ports
  4. Transformation Caches
  5. Address Validator Transformation
  6. Aggregator Transformation
  7. Association Transformation
  8. Bad Record Exception Transformation
  9. Case Converter Transformation
  10. Classifier Transformation
  11. Comparison Transformation
  12. Consolidation Transformation
  13. Data Masking Transformation
  14. Data Processor Transformation
  15. Decision Transformation
  16. Duplicate Record Exception Transformation
  17. Expression Transformation
  18. Filter Transformation
  19. Hierarchical to Relational Transformation
  20. Java Transformation
  21. Java Transformation API Reference
  22. Java Expressions
  23. Joiner Transformation
  24. Key Generator Transformation
  25. Labeler Transformation
  26. Lookup Transformation
  27. Lookup Caches
  28. Dynamic Lookup Cache
  29. Macro Transformation
  30. Match Transformation
  31. Match Transformations in Field Analysis
  32. Match Transformations in Identity Analysis
  33. Normalizer Transformation
  34. Merge Transformation
  35. Parser Transformation
  36. Python Transformation
  37. Rank Transformation
  38. Read Transformation
  39. Relational to Hierarchical Transformation
  40. REST Web Service Consumer Transformation
  41. Router Transformation
  42. Sequence Generator Transformation
  43. Sorter Transformation
  44. SQL Transformation
  45. Standardizer Transformation
  46. Union Transformation
  47. Update Strategy Transformation
  48. Web Service Consumer Transformation
  49. Parsing Web Service SOAP Messages
  50. Generating Web Service SOAP Messages
  51. Weighted Average Transformation
  52. Window Transformation
  53. Write Transformation
  54. Appendix A: Transformation Delimiters

Developer Transformation Guide

Developer Transformation Guide

invokeJExpression

invokeJExpression

Invokes an expression and returns the value for the expression.
Use the following syntax:
(datatype)invokeJExpression(                       String expression,                       Object[] paramMetadataArray);
Input parameters for the invokeJExpression method are a string value that represents the expression and an array of objects that contain the expression input parameters.
The following table describes the parameters:
Parameter
Parameter Type
Datatype
Description
expression
Input
String
String that represents the expression.
paramMetadataArray
Input
Object[]
Array of objects that contain the input parameters for the expression.
You can add the invokeJExpression method to the Java code on any code entry tab except the
Imports
and
Functions
tabs.
Use the following rules and guidelines when you use the invokeJExpression method:
  • Return datatype. The return datatype of the invokeJExpression method is an object. You must cast the return value of the function with the appropriate datatype.
    You can return values with Integer, Double, String, and byte[] datatypes.
  • Row type. The row type for return values from the invokeJExpression method is INSERT.
    To use a different row type for the return value, use the advanced interface.
  • Null values. If you pass a null value as a parameter or the return value for the invokeJExpression method is NULL, the value is treated as a null indicator.
    For example, if the return value of an expression is NULL and the return datatype is String, a string is returned with a value of null.
  • Date datatype. You must convert input parameters with a Date datatype to the String datatype.
    To use the string in an expression as a Date datatype, use the to_date() function to convert the string to a Date datatype.
    Also, you must cast the return type of any expression that returns a Date datatype as a String datatype.
The following example concatenates the strings “John” and “Smith” and returns the string, “John Smith”:
(String)invokeJExpression("concat(x1,x2)", new Object [] { "John ", "Smith" });
You must number the parameters that you pass to the expression consecutively, and start the parameter with the letter x. For example, to pass three parameters to an expression, name the parameters x1, x2, and x3.

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