第十一篇 设计模式--组合模式

定义：将对象组合成树形结构以表示“部分-整体”的层次结构，组合模式使得用户对单个对象和组合对象的使用具有一致性。

代码：

package composite_model;

import java.util.ArrayList;

/**
 * @author naivor
 *		组合模式-场景类
 */
public class CompositeModel {
	public static void main(String[] args) {
		Component root=new Composite("root");  //长出根节点
		root.addComponent(new Leaf("leaf A"));  //根节点长出叶A
		
		Component compositeB=new Composite("composite B");
		root.addComponent(compositeB);	//根节点长出枝节点B
		compositeB.addComponent(new Leaf("leaf AA"));  //枝节点B长出叶AA
		
		Component componentBB=new Composite("composite BB");
		compositeB.addComponent(componentBB);	//枝节点B长出枝节点BB
		
		root.operate();
		
	}

}
/**
 * 
 * @author naivor
 *		组合模式-节点抽象类
 */
abstract class Component {
	private String name;

	public Component() {

	}

	public Component(String name) {
		this.name = name;
	}

	public void addComponent(Component component) {
	};

	public void removeComponent(Component component) {
	};

	public abstract void operate();
}
/**
 * 
 * @author naivor
 *		组合模式-叶节点类
 */
class Leaf extends Component {
	public Leaf() {
		
	}
	public Leaf(String name) {
		super(name);
	}
	
	@Override
	public void operate() {
		//叶节点的业务逻辑
	}

}
/**
 * 
 * @author naivor
 *		组合模式-枝节点类
 */
class Composite extends Component {
	private ArrayList<Component> coms=new ArrayList<Component>();
	
	public Composite() {
		
	}
	public Composite(String name) {
		super(name);
	}
	
	@Override
	public void addComponent(Component component) {
		coms.add(component);
	}
	
	@Override
	public void removeComponent(Component component) {
		coms.remove(component);
	}
	
	@Override
	public void operate() {
		
		for (Component component : coms) {
			component.operate();
		}
		//枝节点的业务逻辑
	}
	
}