java-design-patterns/specification/index.md

layout, title, folder, categories, tags

layout	title	folder	categories	tags
pattern	Specification	specification	pattern_cat	pattern_tag

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

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)