comprehensive proxy pattern Finished

comprehensive/src/main/java/com/luo/composite/menuiterator/CompositeIterator.java

@@ -0,0 +1,56 @@
+package com.luo.composite.menuiterator;
+
+import java.util.Iterator;
+import java.util.Stack;
+
+/**
+ * @author luoxuzheng
+ * @create 2019-09-30 10:44
+ **/
+public class CompositeIterator implements Iterator<MenuComponent> {
+
+    Stack<Iterator<MenuComponent>> stack = new Stack<Iterator<MenuComponent>>();
+
+    public CompositeIterator(Iterator<MenuComponent> iterator) {
+        stack.push(iterator);
+    }
+
+
+    @Override
+    public boolean hasNext() {
+        if (stack.empty()) {
+            return false;
+        } else {
+            Iterator<MenuComponent> iterator = stack.peek();
+            if (!iterator.hasNext()) {
+                stack.pop();
+                return hasNext();
+            } else {
+                return true;
+            }
+        }
+    }
+
+    @Override
+    public MenuComponent next() {
+        if (hasNext()) {
+            Iterator<MenuComponent> iterator = stack.peek();
+            MenuComponent component = iterator.next();
+            stack.push(component.createIterator());
+            return component;
+        } else {
+            return null;
+        }
+    }
+
+     /*
+     * No longer needed as of Java 8
+     *
+     * (non-Javadoc)
+     * @see java.util.Iterator#remove()
+     *
+    public void remove() {
+        throw new UnsupportedOperationException();
+    }
+    */
+}

comprehensive/src/main/java/com/luo/composite/menuiterator/Menu.java

@@ -0,0 +1,65 @@
+package com.luo.composite.menuiterator;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+
+/**
+ * @author luoxuzheng
+ * @create 2019-09-30 10:39
+ **/
+public class Menu extends MenuComponent {
+	Iterator<MenuComponent> iterator = null;
+	ArrayList<MenuComponent> menuComponents = new ArrayList<MenuComponent>();
+	String name;
+	String description;
+
+	public Menu(String name, String description) {
+		this.name = name;
+		this.description = description;
+	}
+
+	@Override
+	public void add(MenuComponent menuComponent) {
+		menuComponents.add(menuComponent);
+	}
+
+	@Override
+	public void remove(MenuComponent menuComponent) {
+		menuComponents.remove(menuComponent);
+	}
+
+	@Override
+	public MenuComponent getChild(int i) {
+		return menuComponents.get(i);
+	}
+
+	@Override
+	public String getName() {
+		return name;
+	}
+
+	public String getDescription() {
+		return description;
+	}
+
+	@Override
+	public Iterator<MenuComponent> createIterator() {
+		if (iterator == null) {
+			iterator = new CompositeIterator(menuComponents.iterator());
+		}
+		return iterator;
+	}
+
+	@Override
+	public void print() {
+		System.out.print("\n" + getName());
+		System.out.println(", " + getDescription());
+		System.out.println("---------------------");
+
+		Iterator<MenuComponent> iterator = menuComponents.iterator();
+		while (iterator.hasNext()) {
+			MenuComponent menuComponent = iterator.next();
+			menuComponent.print();
+		}
+	}
+}

comprehensive/src/main/java/com/luo/composite/menuiterator/MenuComponent.java

@@ -0,0 +1,88 @@
+package com.luo.composite.menuiterator;
+
+import java.util.Iterator;
+
+/**
+ * @author luoxuzheng
+ * @create 2019-09-30 10:39
+ **/
+public abstract class MenuComponent {
+
+    /**
+     * 增加
+     * @param menuComponent
+     */
+    public void add(MenuComponent menuComponent) {
+
+        throw new UnsupportedOperationException();
+    }
+
+    /**
+     * 删除
+     * @param menuComponent
+     */
+    public void remove(MenuComponent menuComponent) {
+
+        throw new UnsupportedOperationException();
+    }
+
+    /**
+     * 获取子节点
+     * @param i
+     * @return
+     */
+    public MenuComponent getChild(int i) {
+
+        throw new UnsupportedOperationException();
+    }
+
+    /**
+     * 获取名称
+     * @return
+     */
+    public String getName() {
+
+        throw new UnsupportedOperationException();
+    }
+
+    /**
+     * 获取描述
+     * @return
+     */
+    public String getDescription() {
+
+        throw new UnsupportedOperationException();
+    }
+
+    /**
+     * 获取价格
+     * @return
+     */
+    public double getPrice() {
+
+        throw new UnsupportedOperationException();
+    }
+
+    /**
+     * 是否是蔬菜
+     * @return
+     */
+    public boolean isVegetarian() {
+
+        throw new UnsupportedOperationException();
+    }
+
+    /**
+     * 创建迭代器
+     * @return
+     */
+    public abstract Iterator<MenuComponent> createIterator();
+
+    /**
+     * 打印
+     */
+    public void print() {
+
+        throw new UnsupportedOperationException();
+    }
+}

comprehensive/src/main/java/com/luo/composite/menuiterator/MenuItem.java

@@ -0,0 +1,64 @@
+package com.luo.composite.menuiterator;
+
+import java.util.Iterator;
+
+/**
+ * @author luoxuzheng
+ * @create 2019-09-30 10:39
+ **/
+public class MenuItem extends MenuComponent {
+
+	String name;
+	String description;
+	boolean vegetarian;
+	double price;
+
+	public MenuItem(String name, 
+	                String description, 
+	                boolean vegetarian, 
+	                double price) 
+	{ 
+		this.name = name;
+		this.description = description;
+		this.vegetarian = vegetarian;
+		this.price = price;
+	}
+
+	@Override
+	public String getName() {
+		return name;
+	}
+
+	@Override
+	public String getDescription() {
+		return description;
+	}
+
+	@Override
+	public double getPrice() {
+		return price;
+	}
+
+	@Override
+	public boolean isVegetarian() {
+		return vegetarian;
+	}
+
+	@Override
+	public Iterator<MenuComponent> createIterator() {
+
+		return new NullIterator();
+	}
+
+	@Override
+	public void print() {
+		System.out.print("  " + getName());
+		if (isVegetarian()) {
+			System.out.print("(v)");
+		}
+		System.out.println(", " + getPrice());
+		System.out.println("     -- " + getDescription());
+	}
+
+}
+

comprehensive/src/main/java/com/luo/composite/menuiterator/MenuItemTest.java

@@ -0,0 +1,33 @@
+package com.luo.composite.menuiterator;
+
+/**
+ * @author luoxuzheng
+ * @create 2019-09-30 11:31
+ **/
+public class MenuItemTest {
+
+    public static void main(String[] args) {
+        MenuComponent hotdog = new MenuItem("Hotdog",
+                "A hot dog, with saurkraut, relish, onions, topped with cheese",
+                false,
+                3.05);
+
+        MenuComponent colddog = new MenuItem("colddog",
+                "A cold dog, with saurkraut, relish, onions, topped with cheese",
+                true,
+                3.05);
+
+
+        MenuComponent allMenus = new Menu("ALL MENUS", "All menus combined");
+
+        allMenus.add(hotdog);
+        allMenus.add(colddog);
+
+        Waitress waitress = new Waitress(allMenus);
+
+//        waitress.printMenu();
+
+        waitress.printVegetarianMenu();
+    }
+
+}