java barcode generator library Identify the Most Appropriate Design Pattern in Java

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Identify the Most Appropriate Design Pattern
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FIGURE 5-8
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UML for the Composite pattern
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n You want to represent a full or partial hierarchy of objects. n You want clients to be able to ignore the differences between the varying
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objects in the hierarchy.
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n The structure is dynamic and can have any level of complexity: for example,
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using the Composite View from the J2EE Patterns Catalog, which is useful for portal applications.
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Example Code pattern:
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The following example Java code demonstrates the Composite
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package javaee.architect.Composite; public class CompositePattern { public static void main(String[] args) { System.out.println("Composite Pattern Demonstration."); System.out.println("--------------------------------"); System.out.println("Creating leaves, branches and trunk"); // Create leaves Component leaf1 = new Leaf(" leaf#1"); Component leaf2 = new Leaf(" leaf#2"); Component leaf3 = new Leaf(" leaf#3"); // Create branches Component branch1 = new Composite(" branch1");
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5: Design Patterns
Component branch2 = new Composite(" branch2"); // Create trunk Component trunk = new Composite("trunk"); // Add leaf1 and leaf2 to branch1 branch1.add(leaf1); branch1.add(leaf2); // Add branch1 to trunk trunk.add(branch1); // Add leaf3 to branch2 branch2.add(leaf3); // Add branch2 to trunk trunk.add(branch2); // Show trunk composition System.out.println("Displaying trunk composition:"); trunk.display(); // Remove branch1 and branch2 from trunk trunk.remove(branch1); trunk.remove(branch2); // Show trunk composition now System.out.println("Displaying trunk composition now:"); trunk.display(); System.out.println(); } } package javaee.architect.Composite; public abstract class Component { public abstract void display(); public void add(Component c) { // override in concrete class; } public void remove(Component c) { // override in concrete class; } public Component getChild(int index) { return null; } public String getName() { return null; } } package javaee.architect.Composite; import java.util.*; public class Composite extends Component { String name = null; List children = new ArrayList(); public Composite(String parm) { this.name = parm; System.out.println(parm.trim()+" constructed."); }
Identify the Most Appropriate Design Pattern
public String getName() { return name; } public Component getChild(int parm) { Component child; try {child = (Component) children.get(parm);} catch (IndexOutOfBoundsException ioobe) {child = null;} return child; } public void add(Component parm) { try { System.out.println("Adding "+parm.getName().trim() +" to "+this.getName().trim()); children.add(parm); } catch (Exception e) {System.out.println(e.getMessage());} } public void remove(Component parm) { try { System.out.println("Removing "+parm.getName().trim() +" from "+this.getName().trim()); children.remove(parm);} catch (Exception e) {System.out.println(e.getMessage());} } public void display() { Iterator iterator = children.iterator(); System.out.println(this.getName() +(iterator.hasNext() " with the following: ":" that is bare.")); while (iterator.hasNext()) {((Component) iterator.next()).display();} } } package javaee.architect.Composite; public class Leaf extends Component { private String name; public Leaf(String parm) { this.name = parm; System.out.println(parm.trim()+" constructed."); } public void display() { System.out.println(this.getName()); } public String getName() { return name; } }
5: Design Patterns
FIGURE 5-9
UML for the Decorator pattern
Decorator
An alternative to subclassing to extend functionality, the Decorator pattern s intent is to attach flexible additional responsibilities to an object dynamically. The Decorator pattern uses composition instead of inheritance to extend the functionality of an object at runtime. The Decorator pattern is also known as Wrapper. The UML is shown in Figure 5-9.
Benefits Following is a list of benefits of using the Decorator pattern:
n It provides greater flexibility than static inheritance. n It avoids the need to place feature-laden classes higher up the hierarchy. n It simplifies coding by allowing you to develop a series of functionality-
targeted classes, instead of coding all of the behavior into the object.
n It enhances the extensibility of the object, because changes are made by
coding new classes.
Identify the Most Appropriate Design Pattern
Applicable Scenarios The following scenarios are most appropriate for the Decorator pattern:
n You want to transparently and dynamically add responsibilities to objects
without affecting other objects.
n You want to add responsibilities to an object that you may want to change in
the future.
n Extending functionality by subclassing is no longer practical.
Java EE Technology Feature and Java SE API Association The Java EE technology feature associated with the Decorator pattern is javax.ejb.EJBObject. The Java SE API associated with the Decorator pattern is java.io.BufferedReader. Example Code pattern:
The following example Java code demonstrates the Decorator
package javaee.architect.Decorator; public class DecoratorPattern { public static void main(String[] args) { System.out.println("Decorator Pattern Demonstration."); System.out.println("--------------------------------"); // Create object decorated with A System.out.println("Creating component decorated with A."); ComponentIF decorated1 = new ConcreteDecoratorA(); // Call action on object decorated with A System.out.println("Calling action() on component decorated with A."); decorated1.action(); // Create object decorated with B System.out.println("Creating component decorated with B."); ComponentIF decorated2 = new ConcreteDecoratorB(); // Call action on object decorated with B System.out.println("Calling action() on component decorated with B."); decorated2.action(); System.out.println(); } } package javaee.architect.Decorator; public interface ComponentIF { public void action(); }
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