Specification pattern: Difference between revisions

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{{shortShort description|Software design pattern}}

[[ImageFile:Specification UML.png|right|thumb|300px|Specification Pattern in [[Unified Modeling Language|UML]] ]]

In computer programming, the '''specification pattern''' is a particular [[software design pattern]], whereby [[business rules]] can be recombined by chaining the business rules together using [[boolean algebra|boolean logic]]. The pattern is frequently used in the context of [[___domain-driven design]].

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== Code examples ==

=== [[C Sharp (programming language)|C#]] ===

{{Further|C Sharp (programming language)}}

<syntaxhighlight lang="csharp">

public interface ISpecification

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</syntaxhighlight>

=== [[C Sharp (programming language)|C# 6.0]] with generics ===

{{Further|C Sharp (programming language)}}

<syntaxhighlight lang="csharp">

public interface ISpecification<T>

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</syntaxhighlight>

=== [[Python (programming language)|Python]] ===

{{Further|Python (programming language)}}

<syntaxhighlight lang="python">

from abc import ABC, abstractmethod

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</syntaxhighlight>

=== [[C++ (programming language)|C++]] ===

{{Further|C++}}

<syntaxhighlight lang="cpp">

template <class T>

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</syntaxhighlight>

=== [[TypeScript]] ===

{{Further|TypeScript}}

<syntaxhighlight lang="typescript">

export interface ISpecification {

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==Example of use==

In the followingnext example, weinvoices are retrieving invoicesretrieved and sending themsent to a collection agency if:

# they are overdue,

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* [https://web.archive.org/web/20110724151447/http://www.dpdk.nl/opensource/specification-pattern-for-selection-on-lists specification pattern in flash actionscript 3] by Rolf Vreijdenberger

{{Design Patterns Patternspatterns}}

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