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Updated README.md.

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Ilkka Seppala 2015-04-23 22:58:34 +03:00
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@ -57,6 +57,7 @@ Behavioral patterns are concerned with algorithms and the assignment of responsi
* [Visitor](#visitor)
* [Null Object](#null-object)
* [Intercepting Filter](#intercepting-filter)
* [Specification](#specification)
### Presentation Tier Patterns
@ -520,6 +521,17 @@ they store and logic they implement: data loaders, user interfaces, integration
* you want to encapsulate domain logic under API
* you need to implement multiple interfaces with common logic and data
## <a name="specification">Specification</a> [&#8593;](#list-of-design-patterns)
**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
![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/specification/etc/specification.png "Specification")
**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)
# Frequently asked questions
@ -582,6 +594,7 @@ While the implementations look similar there are differences. The Chain of Respo
* [Presentation Tier Patterns](http://www.javagyan.com/tutorials/corej2eepatterns/presentation-tier-patterns)
* [Functional Programming in Java: Harnessing the Power of Java 8 Lambda Expressions](http://www.amazon.com/Functional-Programming-Java-Harnessing-Expressions/dp/1937785467/ref=sr_1_1)
* [Martin Fowler - Service Layer](http://martinfowler.com/eaaCatalog/serviceLayer.html)
* [Martin Fowler - Specifications](http://martinfowler.com/apsupp/spec.pdf)