Composite Design Pattern by: Dela Cruz, Evangelista, Felisco, Jumawan REFERENCE: http://www.javaworld.com/javaworld/jw-09-2002/jw-0913-designpatterns.html http://www.javaworld.com/javaworld/jw-09-2002/jw-0913-designpatterns.html

Composite Objects Objects that contain other objects It compose objects into tree structures to represent part-whole hierarchies. Example: A drawing may be composed of graphic primitives, such as lines, circles, rectangles, text, and so on.

Objects that contain other objects

It compose objects into tree structures to represent part-whole hierarchies.

Example:

A drawing may be composed of graphic primitives, such as lines, circles, rectangles, text, and so on.

Problems Resolved It lets clients treat individual objects and compositions of objects uniformly. We often must manipulate composites exactly the same way we manipulate primitive objects.

It lets clients treat individual objects and compositions of objects uniformly.

We often must manipulate composites exactly the same way we manipulate primitive objects.

Sample Code (Composite method) public void draw() { // Iterate over the components for(int i=0; i < getComponentCount(); ++i) { // Obtain a reference to the component and invoke its draw method Component component = getComponent(i); component.draw(); } }

public void draw() { // Iterate over the components for(int i=0; i < getComponentCount(); ++i) { // Obtain a reference to the component and invoke its draw method Component component = getComponent(i); component.draw(); } }