Added notes, examples and pattern files for Composite pattern.

README.md

@@ -21,7 +21,7 @@ Relativos al proceso de creación de un objeto.
 
 Composición de clases u objetos.
 
-* Nothing yet.
+* [Composite](#composite)
 
 ### Patrones de Comportamiento (Behavioral Patterns)
 
@@ -97,3 +97,20 @@ Es una jerarquía que encapsula muchas *familias* posibles y la creación de un
 
 * [Ovnis](https://github.com/LuisBurgos/design-patterns/tree/master/src/abstractfactory/examples/ufo)
 * [El Reino](https://github.com/LuisBurgos/design-patterns/tree/master/src/abstractfactory/examples/kingdom)
+
+## <a name="composite">Composite</a> [&#8593;](#lista-de-patrones)
+
+**Propósito:** Componer objetos en estructuras de árbol que representan jerarquías de un **todo** y sus **partes.** El Composite provee a los *clientes* un mismo trato para todos los objetos que forman la jerarquía.
+
+Pensemos en nuestro sistema de archivos, este contiene *directorios* con *archivos* y a su vez estos *archivos* pueden ser otros *directorios* que contenga más *archivos*, y así sucesivamente. Lo anterior puede ser representado facilmente con el patrón Composite.
+
+**Aplicación:** Usamos el patrón Composite...
+* Cuando queremos representar jerarquías de objetos
+compuestas por un todo y sus partes.
+* Se quiere que los *clientes* ignoren la diferencia
+entre la composición de objetos y su uso
+individual.
+
+**Ejemplos:**
+* [Menu](https://github.com/LuisBurgos/design-patterns/tree/master/src/composite/examples/menu)
+* [Sistema de Archivos](https://github.com/LuisBurgos/design-patterns/tree/master/src/composite/examples/directories)

src/composite/examples/directories/Directory.java

@@ -0,0 +1,38 @@
+package composite.examples.directories;
+
+import java.util.ArrayList;
+
+/**
+ * Created by luisburgos on 18/07/15.
+ */
+public class Directory extends File {
+
+    private ArrayList<File> files;
+
+    public Directory (String name) {
+        this.name = name;
+        files = new ArrayList<>();
+    }
+
+    @Override
+    public void add(File file) {
+        files.add(file);
+    }
+
+    @Override
+    public void remove(File file) {
+        files.remove(file);
+    }
+
+    @Override
+    public void showInfo() {
+        System.out.print(identado.toString() + "* Directory: " + getName() + "\n");
+        identado.append("   ");
+        for(File file : files){
+            file.showInfo();
+        }
+        identado.setLength(identado.length() - 3);
+    }
+
+
+}

src/composite/examples/directories/File.java

@@ -0,0 +1,27 @@
+package composite.examples.directories;
+
+/**
+ * Created by luisburgos on 18/07/15.
+ */
+public abstract class File {
+
+    protected String name;
+    protected static StringBuffer identado = new StringBuffer();
+
+    public void add(File component) {
+        throw new UnsupportedOperationException();
+    }
+
+    public void remove(File component) {
+        throw new UnsupportedOperationException();
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void showInfo() {
+        throw new UnsupportedOperationException();
+    }
+
+}

src/composite/examples/directories/FileSystem.java

@@ -0,0 +1,19 @@
+package composite.examples.directories;
+
+/**
+ * Created by luisburgos on 18/07/15.
+ */
+public class FileSystem {
+
+    private File allFiles;
+
+    public FileSystem(File allFiles) {
+        this.allFiles = allFiles;
+    }
+
+    public void printFiles() {
+        allFiles.showInfo();
+    }
+
+
+}

src/composite/examples/directories/FileSystemTestDrive.java

@@ -0,0 +1,34 @@
+package composite.examples.directories;
+
+/**
+ * Created by luisburgos on 18/07/15.
+ */
+public class FileSystemTestDrive {
+
+    public static void main(String[] args) {
+
+        //Dummy linux file system.
+
+        File home = new Directory("home");
+        File opt  = new Directory("opt");
+        File usr = new Directory("usr");
+
+        File root = new Directory("root");
+
+        root.add(home);
+        root.add(opt);
+        root.add(usr);
+
+        usr.add(new SimpleFile("bin"));
+        usr.add(new SimpleFile("lib"));
+
+        opt.add(new SimpleFile("google"));
+        opt.add(new SimpleFile("idea"));
+        opt.add(new SimpleFile("spotify"));
+
+        home.add(new SimpleFile("luisburgos"));
+
+        FileSystem fileSystem = new FileSystem(root);
+        fileSystem.printFiles();
+    }
+}

src/composite/examples/directories/SimpleFile.java

@@ -0,0 +1,16 @@
+package composite.examples.directories;
+
+/**
+ * Created by luisburgos on 18/07/15.
+ */
+public class SimpleFile extends File {
+
+    public SimpleFile(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public void showInfo() {
+        System.out.print(identado.toString() + "-Simple File: " + getName() + "\n");
+    }
+}

src/composite/examples/menu/Client.java

@@ -0,0 +1,14 @@
+package composite.examples.menu;
+
+public class Client {
+
+    private MenuComponent allMenus;
+
+    public Client(MenuComponent todosLosMenus) {
+        this.allMenus = todosLosMenus;
+    }
+
+    public void printMenu() {
+        allMenus.print();
+    }
+}

src/composite/examples/menu/MenuComponent.java

@@ -0,0 +1,31 @@
+package composite.examples.menu;
+
+public abstract class MenuComponent {
+
+    protected String name;
+    protected static StringBuffer identado = new StringBuffer();
+
+    public void add(MenuComponent component) {
+        throw new UnsupportedOperationException();
+    }
+
+    public void remove(MenuComponent component) {
+        throw new UnsupportedOperationException();
+    }
+
+    public String getName() {
+        throw new UnsupportedOperationException();
+    }
+
+    public double getPrice() {
+        throw new UnsupportedOperationException();
+    }
+
+    public boolean isVegetarian() {
+        throw new UnsupportedOperationException();
+    }
+
+    public void print() {
+        throw new UnsupportedOperationException();
+    }
+}

src/composite/examples/menu/MenuComposite.java

@@ -0,0 +1,40 @@
+package composite.examples.menu;
+
+import java.util.ArrayList;
+
+public class MenuComposite extends MenuComponent {
+
+    private ArrayList<MenuComponent> menuComponents;
+
+    public MenuComposite(String name) {
+        this.name = name;
+        menuComponents = new ArrayList<>();
+    }
+
+    @Override
+    public void add(MenuComponent component) {
+        this.menuComponents.add(component);
+    }
+
+    @Override
+    public void remove(MenuComponent component) {
+        this.menuComponents.remove(component);
+    }
+
+    @Override
+    public String getName() {
+        return this.name;
+    }
+
+    @Override
+    public void print() {
+
+        System.out.print(identado.toString() + "* " + getName() + "\n");
+        //System.out.println(identado.toString() + "---------------------");
+        identado.append("     ");
+        for(MenuComponent menuComponent : menuComponents){
+            menuComponent.print();
+        }
+        identado.setLength(identado.length() - 5);
+    }
+}

src/composite/examples/menu/MenuItem.java

@@ -0,0 +1,47 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package composite.examples.menu;
+
+/**
+ *
+ * @author luisburgos
+ */
+public class MenuItem extends MenuComponent {
+
+    private boolean vegetarian;
+    private double price;
+
+    public MenuItem(String name, boolean vegetarian, double price) {
+        this.name = name;
+        this.vegetarian = vegetarian;
+        this.price = price;
+    }
+
+    @Override
+    public String getName() {
+        return this.name;
+    }
+
+    @Override
+    public double getPrice() {
+        return this.price;
+    }
+
+    @Override
+    public boolean isVegetarian() {
+        return this.vegetarian;
+    }
+
+    @Override
+    public void print() {
+        System.out.print(identado.toString() + "# " +  getName());
+        if (isVegetarian()) {
+            System.out.print("(v)");
+        }
+        System.out.println("," + getPrice());
+    }
+
+}

src/composite/examples/menu/MenuTestDrive.java

@@ -0,0 +1,58 @@
+package composite.examples.menu;
+
+public class MenuTestDrive {
+
+
+    public static void main(String args[]) {
+
+        MenuComponent meals      = new MenuComposite("Comidas");
+        MenuComponent dinners    = new MenuComposite("Cenas");
+        MenuComponent desserts   = new MenuComposite("Postres");
+        MenuComponent mainCourse = new MenuComposite("Plato Fuerte");
+
+        MenuComponent allMenus = new MenuComposite("Menus");
+
+        allMenus.add(meals);
+        allMenus.add(dinners);
+
+        meals.add(mainCourse);
+        meals.add(desserts);
+
+        mainCourse.add(new MenuItem(
+                        "Crispy Chicken",
+                        false,
+                        100.89)
+        );
+
+        desserts.add(new MenuItem(
+                        "Apple Pie",
+                        false,
+                        15.59)
+        );
+
+        desserts.add(new MenuItem(
+                        "Cheesecake",
+                        false,
+                        19.99)
+        );        
+
+        dinners.add(new MenuItem(
+                        "Hotdogs",
+                        false,
+                        6.05)
+        );
+
+        dinners.add(new MenuItem(
+                        "Spaghetti ",
+                        true,
+                        30.89)
+        );
+
+
+        //The client does not distinguish between item and composite
+        Client client = new Client(allMenus);
+        client.printMenu();
+
+    }
+
+}

src/composite/pattern/Component.java

@@ -0,0 +1,22 @@
+package composite.pattern;
+
+/**
+ * Created by luisburgos on 18/07/15.
+ */
+public abstract class Component {
+
+    protected String name;
+
+    public void add(Component component) {
+        throw new UnsupportedOperationException();
+    }
+    public void remove(Component component) {
+        throw new UnsupportedOperationException();
+    }
+    public abstract void doSomething();
+
+    public String getName() {
+        return name;
+    }
+
+}