気を付けたこと
- kotlinでは複数のクラスを一つのファイルにまとめることが出来るのでまとめた
- privateなコンストラクタの書き方
- コンストラクタの初期化処理はinit{}ブロック内で書く
- staticなメンバはcompanionObjectブロック内で書く
- クラスのgettersetterを変数のように扱えるので元からあるクラスのセッターが変数のようになっている
- 文字列リテラルに${式}の形で直接変数や式を埋め込める
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import java.awt.* import java.awt.event.ActionEvent import java.awt.event.ActionListener import kotlin.system.exitProcess fun main(args: Array<String>) { val frame = SafeFrame("State Sample") while (true) { for (hour in 0 until 24) { frame.setClock(hour) try { Thread.sleep(1000) } catch (e: InterruptedException) { } } } } class DayState private constructor() : State { companion object { private val singleton = DayState() fun getInstance() = singleton } override fun doCLock(context: Context,hour:Int) { if (hour < 9 || 17 <= hour) { context.changeState(NightState.getInstance()) } } override fun doUse(context: Context) { context.recordLog("金子使用（昼間）") } override fun doAlarm(context: Context) { context.callSecurityCenter("非常ベル（昼間）") } override fun doPhone(context: Context) { context.callSecurityCenter("通常の通話（昼間）") } override fun toString(): String { return "[昼間]" } } class NightState private constructor(): State { companion object { private val singleton = NightState() fun getInstance() = singleton } override fun doCLock(context: Context, hour: Int) { if (9 <= hour && hour < 17) { context.changeState(DayState.getInstance()) } } override fun doUse(context: Context) { context.callSecurityCenter("非常：夜間の禁固しよう") } override fun doAlarm(context: Context) { context.callSecurityCenter("非常ベル（夜間）") } override fun doPhone(context: Context) { context.recordLog("夜間の通話録音") } override fun toString(): String { return "「夜間」" } } class SafeFrame(title:String) : Frame(title), ActionListener, Context { private val textClock = TextField(60) private val textScreen = TextArea(10, 60) private val buttonUse = Button("金庫使用") private val buttonAlarm = Button("非常ベル") private val buttonPhone = Button("非常通話") private val buttonExit = Button("終了") private var state:State = DayState.getInstance() init { background = Color.lightGray layout = BorderLayout() add(textClock,BorderLayout.NORTH) textClock.isEditable = false add(textScreen, BorderLayout.CENTER) textScreen.isEditable = false val panel = Panel() panel.add(buttonUse) panel.add(buttonAlarm) panel.add(buttonPhone) panel.add(buttonExit) add(panel, BorderLayout.SOUTH) pack() show() buttonUse.addActionListener(this) buttonAlarm.addActionListener(this) buttonPhone.addActionListener(this) buttonExit.addActionListener(this) } override fun actionPerformed(e: ActionEvent) { println(e.toString()) when (e.source) { buttonUse -> { state.doUse(this) } buttonAlarm -> state.doAlarm(this) buttonPhone -> state.doPhone(this) buttonExit -> exitProcess(0) else -> println("?") } } override fun setClock(hour: Int) { var clockstring = "現在時刻は" if (hour < 10) { clockstring += "0${hour}:00" } else { clockstring += "${hour}:00" } println(clockstring) textClock.text = clockstring state.doCLock(this,hour) } override fun changeState(state: State) { println("${this.state}から${state}へ状態が変化しました") this.state = state } override fun callSecurityCenter(msg: String) { textScreen.append("call! ${msg}\n") } override fun recordLog(msg: String) { textScreen.append("record ... ${msg}\n") } } interface State { abstract fun doCLock(context: Context,hour:Int) abstract fun doUse(context: Context) abstract fun doAlarm(context: Context) abstract fun doPhone(context: Context) } interface Context { abstract fun setClock(hour: Int) abstract fun changeState(state: State) abstract fun callSecurityCenter(msg: String) abstract fun recordLog(msg:String) } |
元のコードは以下の本からの引用です。サンプルコードは著者さんのサイトで配布されています。リンクはAmazonアソシエイトを使用しています。
ライセンス表記
Copyright (C) 2001,2004 Hiroshi Yuki.
hyuki@hyuki.com
This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software. Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions: 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. 3. This notice may not be removed or altered from any source distribution.
