client.java

设计模式描述设计模式描述设计模式描述设计模式描述

/*
 * Created on 2005-5-7
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package com.test.pattern.create.abstractfactory;

/**
 * @author Administrator
 * 
 * 意图 提供一个创建一系列相关或相互依赖对象的接口，而无需指定它们具体的类。 适用性 一个系统要独立于它的产品的创建、组合和表示时。
 * 一个系统要由多个产品系列中的一个来配置时。 当你要强调一系列相关的产品对象的设计以便进行联合使用时。
 * 当你提供一个产品类库，而只想显示它们的接口而不是实现时。
 */
abstract class DPDocument {
	abstract public void Dump();
}

abstract class DPWorkspace {
	abstract public void Dump();
}

abstract class DPView {
	abstract public void Dump();
}

abstract class DPFactory {
	abstract public DPDocument CreateDocument();

	abstract public DPView CreateView();

	abstract public DPWorkspace CreateWorkspace();
}

abstract class DPApplication {
	protected DPDocument doc;

	protected DPWorkspace workspace;

	protected DPView view;

	public void ConstructObjects(DPFactory factory) {
		// Create objects as needed
		doc = factory.CreateDocument();
		workspace = factory.CreateWorkspace();
		view = factory.CreateView();
	}

	abstract public void Dump();

	public void DumpState() {
		if (doc != null)
			doc.Dump();
		if (workspace != null)
			workspace.Dump();
		if (view != null)
			view.Dump();
	}
}

// These classes could be part of an application

class MyApplication extends DPApplication {

	public void Dump() {
		System.out.println("MyApplication exists");
	}
}

class MyDocument extends DPDocument {
	public MyDocument() {
		System.out.println("in MyDocument constructor");
	}

	public void Dump() {
		System.out.println("MyDocument exists");
	}
}

class MyWorkspace extends DPWorkspace {
	public void Dump() {
		System.out.println("MyWorkspace exists");
	}
}

class MyView extends DPView {
	public void Dump() {
		System.out.println("MyView exists");
	}
}

class MyFactory extends DPFactory {
	public DPDocument CreateDocument() {
		return new MyDocument();
	}

	public DPWorkspace CreateWorkspace() {
		return new MyWorkspace();
	}

	public DPView CreateView() {
		return new MyView();
	}
}

/// <summary>
/// Summary description for Client.
/// </summary>

public class Client {
	public static void main(String[] args) {
		DPApplication myApplication = new MyApplication();
		DPFactory factory = new MyFactory();
		myApplication.ConstructObjects(factory);
		myApplication.DumpState();

	}
}