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Identify the Most Appropriate Design Pattern
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context1.contextInterface("The Secret Commissions"); context2.contextInterface("The Secret Commissions"); System.out.println(); } } package javaee.architect.Strategy; public class ConcreteStrategy1 implements StrategyIF { // Switch text to all upper case. public void algorithmInterface(String parm) { System.out.println(parm.toUpperCase()); } } package javaee.architect.Strategy; public class ConcreteStrategy2 implements StrategyIF { // Switch text beginning with "the". public void algorithmInterface(String parm) { System.out.println((parm.toLowerCase().startsWith("the ")) parm.substring (4)+ ", " + parm.substring(0,4) : parm); } } package javaee.architect.Strategy; public class Context { // Reference to the strategy. StrategyIF strategy; // Register reference to strategy on construction. public Context(StrategyIF parm) {this.strategy = parm;} // Call strategy's method. public void contextInterface(String parm) {strategy.algorithmInterface(parm);} } package javaee.architect.Strategy; public interface StrategyIF { public void algorithmInterface(String parm); }
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Template Method
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The Template Method pattern s intent is to define the skeleton of a function in an operation, deferring some steps to its subclasses. The Template Method lets subclasses redefine certain steps of a function without changing the structure of the function. The HttpServlet does this in the servlet API. The UML is shown in Figure 5-22.
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5: Design Patterns
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FIGURE 5-22
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UML for the Template Method pattern
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Benefit The Template Method pattern is a very common technique for reusing code. Applicable Scenarios The following scenarios are most appropriate for the Template Method pattern:
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n You want to implement the nonvarying parts of an algorithm in a single class
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and the varying parts of the algorithm in subclasses.
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n Common behavior among subclasses should be moved to a single common
class, avoiding duplication.
Example Code Method pattern:
The following example Java code demonstrates the Template
package javaee.architect.TemplateMethod; public class TemplateMethodPattern { public static void main(String[] args) { System.out.println("TemplateMethod Pattern Demonstration."); System.out.println("-------------------------------------"); // Construct concrete classes. System.out.println("Constructing concrete classes."); AbstractClass class1 = new ConcreteClass1(); AbstractClass class2 = new ConcreteClass2(); // Call template method. System.out.println("Calling template methods."); class1.templateMethod();
Identify the Most Appropriate Design Pattern
class2.templateMethod(); System.out.println(); } } package javaee.architect.TemplateMethod; public abstract class AbstractClass { public void templateMethod() { System.out.println("AbstractClass.templateMethod() called."); primitiveOperation1(); primitiveOperationN(); } public abstract void primitiveOperation1(); public abstract void primitiveOperationN(); } package javaee.architect.TemplateMethod; public class ConcreteClass1 extends AbstractClass { public void primitiveOperation1() { System.out.println("ConcreteClass1.primitiveOperation1() called."); } public void primitiveOperationN() { System.out.println("ConcreteClass1.primitiveOperationN() called."); } } package javaee.architect.TemplateMethod; public class ConcreteClass2 extends AbstractClass { public void primitiveOperation1() { System.out.println("ConcreteClass2.primitiveOperation1() called."); } public void primitiveOperationN() { System.out.println("ConcreteClass2.primitiveOperationN() called."); } }
Visitor
The Visitor pattern s intent is to represent an operation to be performed on elements of an object structure. The Visitor pattern allows for the addition of a new operation without changing the classes of the elements on which it is to operate. Figure 5-23 shows the UML.
5: Design Patterns
FIGURE 5-23
UML for the Visitor pattern
Benefits Following are the benefits of using the Visitor pattern:
n It simplifies the addition of new operations. n It gathers related operations while separating unrelated ones.
Applicable Scenarios The following scenarios are most appropriate for the Visitor pattern:
n An object structure contains many objects with differing interfaces and there
is a need to perform operations on these objects in a way that depends on their concrete classes.
n Many distinct and unrelated operations need to be performed on objects
in a structure and there is a need to avoid cluttering the classes with these operations.
n The classes defining the object structure rarely change but you frequently
need to define new operations that perform over the structure.
Example Code The following example Java code demonstrates the Visitor pattern:
package javaee.architect.Visitor; public class VisitorPattern { public static void main(String[] args) { System.out.println("Visitor Pattern Demonstration."); System.out.println("------------------------------"); // Construct list of elements. System.out.println("Constructing two elements."); ElementIF[] elements = new ElementIF[2];
Identify the Most Appropriate Design Pattern
elements[0] = new ConcreteElementA(); elements[1] = new ConcreteElementB(); // Construct object structure. System.out.println("Constructing object structure."); ObjectStructure objectStructure = new ObjectStructure(elements); // Visit elements in object structure. System.out.println("Visiting elements in object structure."); objectStructure.visitElements(); System.out.println(); } } package javaee.architect.Visitor; public class ConcreteElementA implements ElementIF { public void accept(VisitorIF parm) { parm.visitConcreteElementA(this); } public void operationA() { System.out.println("ConcreteElementA.operationA() called."); } } package javaee.architect.Visitor; public class ConcreteElementB implements ElementIF { public void accept(VisitorIF parm) { parm.visitConcreteElementB(this); } public void operationB() { System.out.println("ConcreteElementB.operationB() called."); } } package javaee.architect.Visitor; public class ConcreteVisitor implements VisitorIF { public void visitConcreteElementA(ConcreteElementA parm) { parm.operationA(); } public void visitConcreteElementB(ConcreteElementB parm) { parm.operationB(); } } package javaee.architect.Visitor; public interface ElementIF { public void accept(VisitorIF parm); }
5: Design Patterns
package javaee.architect.Visitor; import java.util.*; public class ObjectStructure { private List objectStruct; private VisitorIF visitor; public ObjectStructure(ElementIF[] parm) { objectStruct = Arrays.asList(parm); } public void visitElements() { if (visitor == null) { visitor = new ConcreteVisitor(); } for (Iterator i = objectStruct.iterator(); i.hasNext();) { ((ElementIF) i.next()).accept(visitor); } } } package javaee.architect.Visitor; public interface VisitorIF { public void visitConcreteElementA(ConcreteElementA parm); public void visitConcreteElementB(ConcreteElementB parm); }
Now that we ve covered each of the Gang of Four s (GoF) Design Patterns, let s review scenarios and also identify the Design Pattern that is most appropriate as a solution.
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