Design Patterns | Bridge

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1. References
2. Example
   • The Implementor
   • The Concrete Implementor (1)
   • The Concrete Implementor (2)
   • The Abstraction
   • The Refined Abstraction (1)
   • The Refined Abstraction (2)
   • A simple class to test the Bridge design pattern

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1. References
   • Definition: (source: http://en.wikipedia.org/wiki/Bridge_pattern)
     
     The intent of the bridge pattern is to "decouple an abstraction from its implementation so that the two can vary independently."
     
     
   • Class diagram: (source: http://en.wikipedia.org/wiki/Bridge_pattern)
     
     
2. Example
   • The Implementor:
     
     public interface Logger { void log(); }
     
   • The Concrete Implementor (1):
     
     public class FileLogger implements Logger { public void log() { System.out.println("FileLogger-log"); } }
     
   • The Concrete Implementor (2):
     
     public class ConsoleLogger implements Logger { public void log() { System.out.println("ConsoleLogger-log"); } }
     
   • The Abstraction:
     
     public interface AbstractionLogger { void log(); }
     
   • The Refined Abstraction (1):
     
     public class AbstractionFileLogger implements AbstractionLogger { private final Logger logger = new FileLogger(); public void log() { logger.log(); } }
     
   • The Refined Abstraction (2):
     
     public class AbstractionConsoleLogger implements AbstractionLogger { private final Logger logger = new ConsoleLogger(); public void log() { logger.log(); } }
     
   • A simple class to test the Bridge design pattern:
     
     public class BridgePatternTest { public static void main(String[] args) { // Example 1: File Logger final AbstractionLogger fileLogger = new AbstractionFileLogger(); fileLogger.log(); // Example 2: Console Logger final AbstractionLogger consoleLogger = new AbstractionConsoleLogger(); consoleLogger.log(); } }