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‎abstract-factory/README.md

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* Dependency injection in java hides the service class dependencies that can lead to runtime errors that would have been caught at compile time.
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## Presentations
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* [Abstract Factory Pattern](etc/presentation.html)
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## Real world examples
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* [javax.xml.parsers.DocumentBuilderFactory](http://docs.oracle.com/javase/8/docs/api/javax/xml/parsers/DocumentBuilderFactory.html)

‎abstract-factory/etc/diagram1.png

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‎abstract-factory/etc/presentation.html

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<!--
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The MIT License
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Copyright (c) 2017 Rodolfo Forte
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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-->
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<!DOCTYPE html>
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<html>
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<head>
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<title>Design Patterns - Abstract Factory Presentation</title>
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<meta charset="utf-8">
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@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
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@import url(https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic);
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@import url(https://fonts.googleapis.com/css?family=Ubuntu+Mono:400,700,400italic);
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body { font-family: 'Droid Serif'; }
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h1, h2, h3 {
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font-family: 'Yanone Kaffeesatz';
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</head>
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<body>
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<textarea id="source">
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class: center, middle
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# Abstract Factory
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---
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# Also known as
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* Kit
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---
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# Intent
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* Provide an interface for creating families of related or dependent objects without specifying their concrete classes
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---
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# Explanation
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* [Wikipedia](https://en.wikipedia.org/wiki/Abstract_factory_pattern) says:
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> "The abstract factory pattern provides a way to encapsulate a group of individual factories that have a common theme without specifying their concrete classes"
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<br />
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* In plain words:
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* A factory that groups individual but related/dependent factories together without specifying their concrete classes;
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* A factory of factories;
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---
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# Example
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* In a factory that creates kingdoms, we need objects with common theme:
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* Elven kingdom needs an Elven king, Elven castle and Elven army;
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* Orcish kingdom needs an Orcish king, Orcish castle and Orcish army;
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<br />
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* There is a dependency between the objects in the kingdom;
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---
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# Diagram
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* Based on the kingdom example, the diagram below showcases the different concrete factories and their concrete products:
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.center[![Diagram](diagram1.png)]
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---
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# Diagram
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* The class diagram below showcases the factory of factories;
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* At runtime, we can define which Kingdom type is needed and pass it as a parameter to define which concrete KingdomFactory to instantiate;
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* The concrete factory returned will then be able to produce the related objects of the specified type;
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.center[![Diagram](diagram2.png)]
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---
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# Applicability
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Use the Abstract Factory pattern when:
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* A system should be independent of how its products are created, composed and represented;
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* A system should be configured with one of multiple families of products;
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* A family of related product objects is designed to be used together, and you need to enforce this constraint;
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* You want to provide a class library of products, and you want to reveal just their interfaces, not their implementations;
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---
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# Applicability
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Use the Abstract Factory pattern when:
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* The lifetime of the dependency is conceptually shorter than the lifetime of the consumer;
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* You need a run-time value to construct a particular dependency;
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* You want to decide which product to call from a family at runtime;
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* You need to supply one or more parameters only known at run-time before you can resolve a dependency;
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---
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#Use Cases
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* Selecting to call the appropriate implementation of FileSystemAcmeService or DatabaseAcmeService or NetworkAcmeService at runtime;
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* Unit test case writing becomes much easier;
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---
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# Consequences
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* Dependency injection in java hides the service class dependencies that can lead to runtime errors that would have been caught at compile time
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---
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# Real world examples
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[javax.xml.parsers.DocumentBuilderFactory](http://docs.oracle.com/javase/8/docs/api/javax/xml/parsers/DocumentBuilderFactory.html)
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[javax.xml.transform.TransformerFactory](http://docs.oracle.com/javase/8/docs/api/javax/xml/transform/TransformerFactory.html#newInstance--)
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[javax.xml.xpath.XPathFactory](http://docs.oracle.com/javase/8/docs/api/javax/xml/xpath/XPathFactory.html#newInstance--)
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---
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# Credits
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* [Design Patterns: Elements of Reusable Object-Oriented Software](http://www.amazon.com/Design-Patterns-Elements-Reusable-Object-Oriented/dp/0201633612)
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---
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# Tutorials
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* Source code http://java-design-patterns.com/patterns/abstract-factory/
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</textarea>
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<script src="https://gnab.github.io/remark/downloads/remark-latest.min.js">
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</script>
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<script>
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var slideshow = remark.create();
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</script>
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</body>
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</html>

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