//组合模式
//CopyRight(C) CAnca software Office.2006
//Created by CAnca.

import java.util.*;

public class ComponantMode{
 public static void main(String[] args){
  Componant Root = new compositionElement("Books");
  Root.Add(new leaf("Java 设计模式"));
  Root.Add(new leaf("C# 高级编程"));
  Root.Add(new leaf("VB 程序设计"));
  Componant js = new leaf("JavaScript 高级编程");
  Root.Add(js);
  Componant food = new compositionElement("Foods");
  food.Add(new leaf("Apple"));
  food.Add(new leaf("Banana"));
  food.Add(new leaf("Pear"));
  Root.Add(food);
  Root.Display(1);
  Root.Remove(js);
  System.out.println();
  Root.Display(1);
 } 
}

abstract class Componant{
 protected String name;
 protected final byte[] BLANK = "-----------------------------".getBytes();
 public Componant(String name){
  this.name = name; 
 }
 public abstract void Add(Componant componant);
 public abstract void Remove(Componant componant);
 public abstract void Display(int indent);
}

class leaf extends Componant{
 
 public leaf(String name){
  super(name);
 }
 
 public void Add(Componant componant){
  System.out.println("Leaf can't Add.");
 }
 
 public void Remove(Componant componant){
  System.out.println("Leaf can't Remove.");
 }
 
 public void Display(int indent){
  if(indent > BLANK.length - 1)indent = BLANK.length - 1;
  System.out.println(new String(BLANK,0,indent) + " " + this.name); 
 }
}

class compositionElement extends Componant{
 
 private ArrayList elements = new ArrayList();
 
 public compositionElement(String name){
  super(name);
 }
 
 public void Add(Componant componant){
  this.elements.add(componant);
 }
 
 public void Remove(Componant componant){
  this.elements.remove(componant);
 }
 
 public void Display(int indent){
  if(indent > BLANK.length - 1)indent = BLANK.length - 1;
  System.out.println(new String(BLANK,0,indent) + "+ " + this.name);
  for(int i = 0 ; i < this.elements.size() ; i++){
   ((Componant)elements.get(i)).Display(indent + 2);
  }
 }
}