Monday, April 13, 2015

Template Pattern

package com.exmpl.templatePattern;
//This is a POJO class for employee.
public class Employee {
       private String userName;
       private String password;
       private String empName;
       private int empId;
       private String empRole;

       public String getUserName() {
              return userName;
       }

       public void setUserName(String userName) {
              this.userName = userName;
       }

       public String getPassword() {
              return password;
       }

       public void setPassword(String password) {
              this.password = password;
       }

       public String getEmpName() {
              return empName;
       }

       public void setEmpName(String empName) {
              this.empName = empName;
       }

       public int getEmpId() {
              return empId;
       }

       public void setEmpId(int empId) {
              this.empId = empId;
       }

       public String getEmpRole() {
              return empRole;
       }

       public void setEmpRole(String empRole) {
              this.empRole = empRole;
       }

       @Override
       public String toString() {
              return "Employee [userName=" + userName + ", password=" + password
                           + ", empName=" + empName + ", empId=" + empId + ", empRole="
                           + empRole + "]";
       }
}

-------------------------------------------------------------------- 
// This class is responsible for creating a template. 
package com.exmpl.templatePattern;

public abstract class TemplateClass {
       public boolean isAuth = false;

       // Template method
       public void displayEmployeeDetails() {
              initializeEmployeeDetails();
              authenticateEmployee();
              if(isAuth == true)
                     performOperation();
       }

       public abstract void initializeEmployeeDetails();

       public abstract void performOperation();

       public abstract void authenticateEmployee();
}

--------------------------------------------------------------------------
// This class extends template class and define it's abstract method. 
package com.exmpl.templatePattern;

public class EmployeeOne extends TemplateClass {
       Employee emp = new Employee();

       @Override
       public void initializeEmployeeDetails() {
              emp.setUserName("admin");
              emp.setPassword("admin");
              emp.setEmpName("Mr. Stive");
              emp.setEmpId(0001);
              emp.setEmpRole("Developer");
       }

       @Override
       public void authenticateEmployee() {
              if (emp.getUserName().equalsIgnoreCase("admin")
                           && emp.getPassword().equalsIgnoreCase("admin")) {
                     isAuth = true;
              }else{
                     System.out.println("Invalid user name and/or password");
              }
       }

       @Override
       public void performOperation() {
              System.out.println("Employee details is as follows: "+emp);
       }
}

----------------------------------------------------------------------------------------------------------
// This class extends template class and define it's abstract method.  
package com.exmpl.templatePattern;

public class EmployeeTwo  extends TemplateClass {
       Employee emp = new Employee();

       @Override
       public void initializeEmployeeDetails() {
              emp.setUserName("adminadmin");
              emp.setPassword("adminadmin");
              emp.setEmpName("Mr. Mark");
              emp.setEmpId(0001);
              emp.setEmpRole("Manager");
       }

       @Override
       public void authenticateEmployee() {
              if (emp.getUserName().equalsIgnoreCase("admin")
                           && emp.getPassword().equalsIgnoreCase("admin")) {
                     isAuth = true;
              }else{
                     System.out.println("Invalid user name and/or password");
              }
       }

       @Override
       public void performOperation() {
              System.out.println("Employee details is as follows: "+emp);
       }
}

-------------------------------------------------------------------------------
// From this class we are calling template method with different instance. 
package com.exmpl.templatePattern;

public class ClientClass {
       public static void main(String[] args) {
              TemplateClass empOne = new EmployeeOne();
              System.out.println("Details of Employe one: ");
              empOne.displayEmployeeDetails();

              TemplateClass empTwo = new EmployeeTwo();
              System.out.println("Details of Employe two: ");
              empTwo.displayEmployeeDetails();
       }

}
---------------------------------------------------------------------------------
Output ==>
Details of Employe one: 
Employee details is as follows: Employee [userName=admin, password=admin, empName=Mr. Stive, empId=1, empRole=Developer]
Details of Employe two: 
Invalid user name and/or password

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