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Mediator Design pattern Groovy implementation

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Mediator design pattern implemented in Groovy (based upon http://www.javacamp.org/designPattern/).

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  1. // The mediator class which connects all the colleges (buttons in this case)
  2. // and updates them all in reaction to informations from any of them 
  3. package design.patterns.mediator
  4. public class Mediator {
  5.     def show
  6.     def buttons = []
  7.  
  8.     void registerButton(b) {
  9.         buttons << b
  10.     }
  11.     void registerDisplay(d) {
  12.         show = d
  13.     }
  14.     void mediate(disable, text) {
  15.         buttons.each {
  16.             if (it == disable) {
  17.                 it.enabled - false
  18.             }
  19.             else {
  20.                 it.enabled = true
  21.             }
  22.         }
  23.         show.setText(text)
  24.     }
  25. }
  26.  
  27. // The demo UI which demonstrates the usage
  28. package design.patterns.mediator.ui
  29. import groovy.swing.SwingBuilder
  30. import design.patterns.mediator.Mediator
  31.  
  32. public class MediatorDemo {
  33.  
  34.     public static void main(String[] args) {
  35.         def Mediator mediator = new Mediator()
  36.         def frame = new SwingBuilder().frame() {
  37.             panel() {
  38.                 label(text: 'just starting') {mediator.registerDisplay(current)}
  39.                 button() {
  40.                     mediator.registerButton(current)
  41.                     action(name: 'view', closure: {mediator.mediate(current, 'viewing ..')})
  42.                 }
  43.                 button() {
  44.                     mediator.registerButton(current)
  45.                     action(name: 'book', closure: {mediator.mediate(current, 'booking ..')})
  46.                 }
  47.  
  48.                 button() {
  49.                     mediator.registerButton(current)
  50.                     action(name: 'search', closure: {mediator.mediate(current, 'searching ..')})
  51.                 }
  52.  
  53.             }
  54.         }
  55.         frame.setSize(400, 200);
  56.         frame.setVisible(true);
  57.     }
  58.  
  59. }

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