状态模式

Author: anxpp

src/com/anxpp/designpattern/state/ISaveData.java

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+package com.anxpp.designpattern.state;
+//抽象状态
+public interface ISaveData {
+	void save(Object data);
+}

src/com/anxpp/designpattern/state/SaveBigData.java

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+package com.anxpp.designpattern.state;
+//具体状态
+public enum SaveBigData implements ISaveData{
+	instance;
+	@Override
+	public void save(Object data) {
+		System.out.println("保存到文件:" + data);
+	}
+}

src/com/anxpp/designpattern/state/SaveDataController.java

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+package com.anxpp.designpattern.state;
+//环境（Context）
+public class SaveDataController {
+	private ISaveData saveData;
+	public void save(String data){
+		//为了演示，此处的大的数据其实也是很小的
+		if(data.length()<1<<2)
+			saveData = SaveSmallData.instance;
+		else if(data.length()<1<<4)
+			saveData = SaveMiddleData.instance;
+		else
+			saveData = SaveBigData.instance;
+		saveData.save(data);
+	}
+}

src/com/anxpp/designpattern/state/SaveMiddleData.java

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+package com.anxpp.designpattern.state;
+//具体状态
+public enum SaveMiddleData implements ISaveData{
+	instance;
+	@Override
+	public void save(Object data) {
+		System.out.println("保存到Mysql:" + data);
+	}
+}

src/com/anxpp/designpattern/state/SaveSmallData.java

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+package com.anxpp.designpattern.state;
+//具体状态
+public enum SaveSmallData implements ISaveData{
+	instance;
+	@Override
+	public void save(Object data) {
+		System.out.println("保存到Redis:" + data);
+	}
+}

src/com/anxpp/designpattern/state/TestUse.java

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+package com.anxpp.designpattern.state;
+public class TestUse {
+	public static void main(String args[]){
+		String smallData = "小数据";
+		String middleData = "介于小数据和大数据之间的数据";
+		String bifgData = "这里就假定这是一个很大很大很大的数据";
+		SaveDataController saveDataController = new SaveDataController();
+		saveDataController.save(smallData);
+		saveDataController.save(middleData);
+		saveDataController.save(bifgData);
+	}
+}

src/com/anxpp/designpattern/state/package-info.java

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+/**
+ * @author Administrator
+ * 状态模式
+ */
+package com.anxpp.designpattern.state;