「CoffeeScript によるデザインパターン(Composite)」ブログ用

composite.coffee

class Task
  constructor: (name, getTime) ->
    @getName = -> name
    @getTimeRequired = -> getTime()
    @parent = null

class CompositeTask extends Task
  constructor: (name) ->
    super(name, => @subTasks.reduce ((sum, time) -> sum + time.getTimeRequired()), 0)
    @subTasks = []

  addSubTask: (tasks...) ->
    for task in tasks
      if task?.getName? and task?.getTimeRequired?
        task.parent = @
        @subTasks.push task
      else
        console.warn task?.constructor?.name + " is not a task"
    @

  removeSubTask: (tasks...) ->
    for task in tasks
      index = @subTasks.indexOf(task)
      if index >= 0
        @subTasks.splice(index, 1)
        task.parent = null
    @

class @AddDryIngredientsTask extends Task
  constructor: -> super("Add dry ingredients", -> 1.0) # 小麦粉と砂糖を加えるのに1分

class @MixTask extends Task
  constructor: -> super("Mix that batter up!", -> 3.0) # 混ぜるのに3分

class @MakeBatterTask extends CompositeTask
  constructor: ->
    super("Make batter")
    @addSubTask(new AddDryIngredientsTask(), new MixTask())

composite1.coffee

class Task
  constructor: (name, getTime) ->
    @getName = -> name
    @getTimeRequired = -> getTime()

class @AddDryIngredientsTask extends Task
  constructor: -> super("Add dry ingredients", -> 1.0) # 小麦粉と砂糖を加えるのに1分

class @MixTask extends Task
  constructor: -> super("Mix that batter up!", -> 3.0) # 混ぜるのに3分

class @MakeBatterTask extends Task
  constructor: ->
    super("Make batter", => @subTasks.reduce ((sum, time) -> sum + time.getTimeRequired()), 0)
    @subTasks = []
    @addSubTask(new AddDryIngredientsTask(), new MixTask())

  addSubTask: (tasks...) ->
    for task in tasks
      if task?.getName? and task?.getTimeRequired?
        @subTasks.push task
      else
        console.warn task?.constructor?.name + " is not a task"
    @

  removeSubTask: (tasks...) ->
    for task in tasks
      index = @subTasks.indexOf(task)
      @subTasks.splice(index, 1) if index >= 0
    @

composite2.coffee

class Task
  constructor: (name, getTime) ->
    @getName = -> name
    @getTimeRequired = -> getTime()

class CompositeTask extends Task
  constructor: (name) ->
    super(name, => @subTasks.reduce ((sum, time) -> sum + time.getTimeRequired()), 0)
    @subTasks = []

  addSubTask: (tasks...) ->
    for task in tasks
      if task?.getName? and task?.getTimeRequired?
        @subTasks.push task
      else
        console.warn task?.constructor?.name + " is not a task"
    @

  removeSubTask: (tasks...) ->
    for task in tasks
      index = @subTasks.indexOf(task)
      @subTasks.splice(index, 1) if index >= 0
    @

class @AddDryIngredientsTask extends Task
  constructor: -> super("Add dry ingredients", -> 1.0) # 小麦粉と砂糖を加えるのに1分

class @MixTask extends Task
  constructor: -> super("Mix that batter up!", -> 3.0) # 混ぜるのに3分

class @MakeBatterTask extends CompositeTask
  constructor: ->
    super("Make batter")
    @addSubTask(new AddDryIngredientsTask(), new MixTask())

composite3.coffee

class Task
  constructor: (name, getTime) ->
    @getName = -> name
    @getTimeRequired = -> getTime()

class CompositeTask extends Array
  constructor: (name) ->
    @getName = -> name
    @getTimeRequired = -> @reduce ((sum, time) -> sum + time.getTimeRequired()), 0

class @AddDryIngredientsTask extends Task
  constructor: -> super("Add dry ingredients", -> 1.0) # 小麦粉と砂糖を加えるのに1分

class @MixTask extends Task
  constructor: -> super("Mix that batter up!", -> 3.0) # 混ぜるのに3分

class @MakeBatterTask extends CompositeTask
  constructor: ->
    super("Make batter")
    @push(new AddDryIngredientsTask(), new MixTask())

CompositeSpec.scala

package views

import org.specs2.mutable.Specification

import play.api.test.TestServer
import play.api.test.Helpers.{ running, HTMLUNIT }

class CompositeSpec extends Specification {

  private val testPort = 3333

  "Composite" should {
    "get time required" in {
      running(TestServer(testPort), HTMLUNIT) { browser =>

        browser.goTo(s"http://localhost:${testPort}/composite")
        browser.executeScript("""
          var adiTask = new AddDryIngredientsTask();
          console.log(adiTask.getTimeRequired());
          var mTask = new MixTask();
          console.log(mTask.getTimeRequired());
          var mbTask = new MakeBatterTask();
          console.log(mbTask.getTimeRequired());
        """)
        browser.$("#__console_log").getValue must_== """1
3
4
"""
          browser.$("#__console_warn").getValue must beNull
      }
    }

    "add some tasks" in {
      running(TestServer(testPort), HTMLUNIT) { browser =>

        browser.goTo(s"http://localhost:${testPort}/composite")
        browser.executeScript("""
          var task = new MakeBatterTask();
          console.log(task.getTimeRequired());
          task.addSubTask(new AddDryIngredientsTask());
          console.log(task.getTimeRequired());
          task.addSubTask(new AddDryIngredientsTask(), new MixTask());
          console.log(task.getTimeRequired());
        """)
        browser.$("#__console_log").getValue must_== """4
5
9
"""
          browser.$("#__console_warn").getValue must beNull
      }
    }

    "remove some tasks" in {
      running(TestServer(testPort), HTMLUNIT) { browser =>

        browser.goTo(s"http://localhost:${testPort}/composite")
        browser.executeScript("""
          var task = new MakeBatterTask();
          console.log(task.getTimeRequired());
          var task1 = new AddDryIngredientsTask();
          var task2 = new MixTask();
          var task3 = new AddDryIngredientsTask();
          var task4 = new MixTask();
          task.addSubTask(task1, task2, task3, task4);
          console.log(task.getTimeRequired());
          task.removeSubTask(task1);
          console.log(task.getTimeRequired());
          task.removeSubTask(task2, task3, task4);
          console.log(task.getTimeRequired());
        """)
        browser.$("#__console_log").getValue must_== """4
12
11
4
"""
          browser.$("#__console_warn").getValue must beNull
      }
    }

    "remove notadded tasks" in {
      running(TestServer(testPort), HTMLUNIT) { browser =>

        browser.goTo(s"http://localhost:${testPort}/composite")
        browser.executeScript("""
          var task = new MakeBatterTask();
          console.log(task.getTimeRequired());
          var task1 = new AddDryIngredientsTask();
          var task2 = new MixTask();
          var task3 = new AddDryIngredientsTask();
          var task4 = new MixTask();
          task.removeSubTask(task1);
          console.log(task.getTimeRequired());
          task.removeSubTask(task2, task3, task4);
          console.log(task.getTimeRequired());
        """)
        browser.$("#__console_log").getValue must_== """4
4
4
"""
          browser.$("#__console_warn").getValue must beNull
      }
    }

    "add invalid tasks" in {
      running(TestServer(testPort), HTMLUNIT) { browser =>

        browser.goTo(s"http://localhost:${testPort}/composite")
        browser.executeScript("""
          var task = new MakeBatterTask();
          console.log(task.getTimeRequired());
          task.addSubTask(1, "a", null);
          console.log(task.getTimeRequired());
        """)
        browser.$("#__console_log").getValue must_== """4
4
"""
          browser.$("#__console_warn").getValue must_== """Number is not a task
String is not a task
undefined is not a task
"""
      }
    }

    "remove invalid tasks" in {
      running(TestServer(testPort), HTMLUNIT) { browser =>

        browser.goTo(s"http://localhost:${testPort}/composite")
        browser.executeScript("""
          var task = new MakeBatterTask();
          console.log(task.getTimeRequired());
          task.removeSubTask(null, 10, "あ");
          console.log(task.getTimeRequired());
        """)
        browser.$("#__console_log").getValue must_== """4
4
"""
          browser.$("#__console_warn").getValue must beNull
      }
    }
  }
}

for-unittest.coffee

window.console =
  log: (msg) ->
    idName = "__console_log"
    $("body").append "<textarea id=\"#{idName}\">" if $("##{idName}").size() is 0
    $("##{idName}").val($("##{idName}").val() + "#{msg}\n")
  warn: (msg) ->
    idName = "__console_warn"
    $("body").append "<textarea id=\"#{idName}\">" if $("##{idName}").size() is 0
    $("##{idName}").val($("##{idName}").val() + "#{msg}\n")

# テストケースで配列のindexOfが使用できなかったための回避コード
# 参考: http://qiita.com/Oakbow/items/3374175d76d82792134d
unless "indexOf" of Array::
  Array::indexOf = (find, i) ->
    i = 0  if i is `undefined`
    i += @length  if i < 0
    i = 0  if i < 0
    n = @length

    while i < n
      return i  if i of this and this[i] is find
      i++
    -1

# テストケースで配列のreduceが使用できなかったための回避コード
# 参考: http://d.hatena.ne.jp/gakuzo/20090414/1239681929
unless "reduce" of Array::
  Array::reduce = (callback, init, thisObject) ->
    return init  if @length is 0
    index = (if init isnt `undefined` then 0 else 1)
    result = (if init isnt `undefined` then init else this[0])
    n = @length

    while index < n
      result = callback.call(thisObject, result, this[index], index, this)
      index++
    result