package designpattern.visitor;

import java.util.ArrayList;

import java.util.List;

/**

* 提供一个高层的接口以允许访问者访问它的元素

*

* @author liu yuning

*

*/

public class ObjectStructure {

private List<Element> elements = new ArrayList<Element>();

public void attach(Element element) {

elements.add(element);

}

public void detach(Element element) {

elements.remove(element);

}

public void accept(Visitor visitor) {

for (Element element : elements) {

element.accept(visitor);

}

}

}