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

Velocity template

Velocity template

You create the Velocity template on the
Velocity
tab. To create the template, enter or paste the template in the template editor. Then click
Validate
to validate the syntax.
The following image shows the template editor:
The Velocity Template tab contains a list of built-in functions on the left and the template editor on the right.
The template can contain VTL statements,
Data Integration
built-in functions, and
Data Integration
unconnected lookup expressions. For more information about the Velocity Template Language, see the Apache Velocity documentation.
To call a built-in function, use the following syntax:
$function.call('<function name>',<argument>,<argument>,...)
For example, the following template code returns the system time stamp in an XML comment:
<!--Generation date: $function.call('Systimestamp')-->
The following function call passes the property $vendor.name as an argument to the INITCAP function to capitalize the first letter of each word in the vendor name:
$function.call('InitCap',$vendor.name)
You can select a function in the
Built-in Functions
list to copy the function call syntax into the template at the cursor position.
To call an unconnected lookup, use the following syntax:
$function.call(':LKP.<Lookup transformation name>)',<argument>,<argument>,...)
For example, the following expression passes the properties $item.id and $item.category as arguments to an unconnected lookup Transformation named lkp_ItemPrices:
$function.call(':LKP.lkp_ItemPrices',$item.id,$item.category)
To validate the syntax, click
Validate
.
Data Integration
checks the template and displays any syntax errors. If the template syntax is invalid, you can save the mapping but the mapping is invalid.
Validation does not test the template output or find runtime errors. You can test the template output on the
Test
tab.