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java-design-patterns/specification/index.md
Markus 5ce932ceb7 Work on #213 
- properly categorize all patterns
- remove pattern list from readme
- minor fixes to readme
- removed "introduction" because its not a pattern and an error i
committed some time ago
2015-08-20 21:40:07 +02:00

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pattern Specification specification /patterns/specification/ Behavioral Java

Intent: Specification pattern separates the statement of how to match a candidate, from the candidate object that it is matched against. As well as its usefulness in selection, it is also valuable for validation and for building to order

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Applicability: Use the Specification pattern when

  • you need to select a subset of objects based on some criteria, and to refresh the selection at various times
  • you need to check that only suitable objects are used for a certain role (validation)