composite added

Author: maciej-nowak

composite/README.md

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+# composite
+This is repository of http://androidcode.pl blog. It shows uses of Composite pattern in Android. It is a part of Design Patterns - Composite post in the blog.

composite/example/Box.java

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+public class Box implements Item {
+
+    private String name;
+    private String sector;
+    private Status status;
+    private List<Item> items;
+
+    public Box(String name) {
+        this.name = name;
+        this.sector = "main";
+        this.status = Status.MAGAZINE;
+        this.items = new ArrayList();
+    }
+
+    @Override
+    public String getInfo() {
+        String info = name + " contains: ";
+        for(Item item : items)
+            info = info + item.getInfo() + "\n";
+        return info;
+    }
+
+    @Override
+    public double getPrice() {
+        double price = 0;
+        for(Item item : items)
+            price += item.getPrice();
+        return price;
+    }
+
+    @Override
+    public void changeStatus(Status status) {
+        this.status = status;
+        for(Item item : items)
+            item.changeStatus(status);
+    }
+
+    public void addItem(Item item) {
+        items.add(item);
+    }
+
+    public void removeItem(Item item) {
+        item.changeStatus(Status.MAGAZINE);
+        items.remove(item);
+    }
+
+    public void changeSector(String sector) {
+        this.sector = sector;
+    }
+
+    public String getSector() {
+        return sector;
+    }
+}

composite/example/Item.java

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+interface Item {
+
+    String getInfo();
+    void getPrice();
+    void changeStatus(Status status);
+}

composite/example/Main.java

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+public class Main {
+
+	public static void main() {
+		//workers colect the order
+		//small items in bag
+		Box bag = new Box("Bag");
+		Item item1 = new Item("Bulb", 10.0);
+		Item item2 = new Item("Towel", 5.00);
+		bag.addItem(item1);
+		bag.addItem(item2);
+
+		//fragile products in box
+		Box box = new Box("Box");
+		Item item3 = new Item("Wine glass", 8.00);
+		Item item4 = new Item("Wine glass", 8.00);
+		Item item5 = new Item("Jug", 13.00);
+		box.addItem(item3);
+		box.addItem(item4);
+		box.addItem(item5);
+
+		//small and fragile items moved to deliver zone
+		bag.changeSector("A1");
+		bag.changeStatus(Status.READY);
+		box.changeSector("B2");
+		box.changeStatus(Status.READY);
+
+		//client canceled one item
+		box.removeItem(item4);
+
+		//order is ready to deliver
+		//workers get boxes from sectors
+		String bagSector = bag.getSector();
+		String boxSector = box.getSector();
+		Box container = new Box("Container");
+		container.addItem(bag);
+		container.addItem(box);
+
+		//prepare recipe
+		String orderInfo = container.getInfo();
+		double orderPrice = container.getPrice();
+
+		//deliver order to client
+		container.changeStatus(Status.DELIVER);
+	}
+}

composite/example/Product.java

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+public class Product implements Item {
+
+    private String name;
+    private Status status;
+    private double price;
+
+    public Product(String name, double price) {
+        this.name = name;
+        this.price = price;
+        this.status = Status.MAGAZINE;
+    }
+
+    @Override
+    public String getInfo() {
+        return name;
+    }
+
+    @Override
+    public double getPrice() {
+        return price;
+    }
+
+    @Override
+    public void changeStatus(Status status) {
+        this.status = status;
+    }
+}

composite/example/enum/Status.java

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+public enum Status {
+
+	MAGAZINE(0),
+	READY(1),
+	DELIVER(2),
+	DELIVERED(3);
+
+	int status;
+
+	public Status(int status) {
+		this.status = status;
+	}
+}

composite/pattern/Component.java

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+interface Component {
+
+    void operation();
+}

composite/pattern/Composite.java

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+public class Composite implements Component {
+
+    private List<Component> childrens;
+    //other fields
+
+    public Composite() {
+        childrens = new ArrayList();
+    }
+
+    public void addChild(Component component) {
+        childrens.add(component);
+    }
+
+    public void removeChild(Component component) {
+        childrens.remove(component);
+    }
+
+    @Override
+    public void operation() {
+        //do action
+        for(Component children : childrens) {
+            children.operation();
+        }
+    }
+
+    //other methods
+}

composite/pattern/Leaf.java

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+public class Leaf implements Component {
+
+    //some fields
+
+    @Override
+    public void operation() {
+        //do action
+    }
+
+    //other methods
+}

composite/pattern/Main.java

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+public class Main {
+
+	public static void main() {
+		//create components
+		Composite composite1 = new Composite();
+		Composite composite2 = new Composite();
+		Leaf leaf1 = new Leaf();
+		Leaf leaf1 = new Leaf();
+		Leaf leaf1 = new Leaf();
+
+		//create tree structure
+		composite2.addChild(leaf2);
+		composite2.addChild(leaf3);
+		composite1.addChild(leaf1);
+		composite1.addChild(composite2);
+
+		//do some action
+		composite1.action(); //do action for every child in composite1
+	}
+}