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The '''Bridge pattern''' is intended allows you to decouple an abstraction from its implementation so both can vary independently. The Bridge pattern is also know as Handle/Body.<br/><br/>
__TOC__
== UML Structure ==
<li>we want to hide the implementation of an abstraction completely from clients</li>
<li>we want to share an implementation among multiple objects, and this fact should be hiddent from the client</li>
<li>useful in graphic and windowing systems that need to run over multiple platforms</li>
<li>useful any time we need to vary an interface and an implementation in different ways</li>
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== Code Examples ==
====PHP Java Bridge in Java Code====The following code is found on "Oregon State University Open Source Lab" which illustrate the Bridge pattern. The following is a part of the code which allows user to vary the class loader. <br/>
Source: http://gentoo.osuosl.org/distfiles/php-java-bridge_2.0.8.tar.bz2<br/>
File: JavaBridge.java<br/>
public void updateJarLibraryPath(String path, String extensionDir) {
if(cl==null) {
bridge.logMessage("You don't have permission to call java_set_library_path() or java_require(). Please store your libraries in the lib folder within JavaBridge.war");
return;
}
====Real-world Sample code in C#====
This real-world code demonstrates the Bridge pattern in which a BusinessObject abstraction is decoupled from the implementation in DataObject. The DataObject implementations can evolve dynamically without changing any clients. <br/>Source: http://www.dofactory.com/Patterns/PatternBridge.aspx
<pre>
// Bridge pattern -- Real World example
====Sample Code in Java====
The following is an easier to follow example of the Bridge pattern:<br/>
Source: http://en.wikipedia.org/wiki/Bridge_pattern
<pre>
import java.util.*;
<li>[http://www.dofactory.com/Patterns/PatternBridge.aspx DoFactory.com - Bridge Design Pattern]</li>
<li>[http://home.earthlink.net/~huston2/dp/all_uml.html Design Class Diagrams - Bridge]</li>
<li>[Source: http://gentoo.osuosl.org/distfiles/php-java-bridge_2.0.8.tar.bz2 Oregon State University Open Source Lab - BridgeJavaBridge.java]</li>
<li>Gamma, E., Helm, R., Johnson, R., Vlissides, J. (1995). Design Patterns: Elements of Reusable Object-Oriented Software. Addison-Wesley. ISBN 0-201-63361-2 </li>
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