Adapter Pattern – Implementation [Object Adapter]

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Adapter Pattern – Implementation [Object Adapter]

Adapter Pattern – Implementation [Object Adapter] - Class Diagram

Employee.java

public class Employee
{
private int    empId;
private String name;
private String designation;

public Employee( int empId, String name, String designation )
{
super();
this.empId = empId;
this.name = name;
this.designation = designation;
}

public int getEmpId()
{
return empId;
}

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

public String getName()
{
return name;
}

public void setName( String name )
{
this.name = name;
}

public String getDesignation()
{
return designation;
}

public void setDesignation( String designation )
{
this.designation = designation;
}

@Override
public String toString()
{
return "Employee [empId=" + empId + ", name=" + name + ", designation=" + designation + "]";
}

}

ThirdPartyBillingSystem.java

import java.util.ArrayList;

/*
 * ThirdPartyBillingSystem accepts employees information as a List to process each employee salary
 */
public class ThirdPartyBillingSystem
{
public void processSalary( ArrayList<Employee> employeeList )
{
for( Employee employee : employeeList )
{
System.out.print("\n"+employee.toString()+" : ");
if( employee.getDesignation().equalsIgnoreCase("Team Leader") )
{
System.out.println("70000Rs Salary credited to " + employee.getName() + " Account\n");
}
else if( employee.getDesignation().equalsIgnoreCase("Developer") )
{
System.out.println("40000Rs Salary credited to " + employee.getName() + " Account\n");
}
else if( employee.getDesignation().equalsIgnoreCase("Tester") )
{
System.out.println("30000Rs Salary credited to " + employee.getName() + " Account\n");
}
}
}

}

ITarget.java

public interface ITarget
{
public void processCompanySalary(String[][] employeeInfo);
}

EmployeeAdapter.java

import java.util.ArrayList;

public class EmployeeAdapter implements ITarget
{
ThirdPartyBillingSystem thirdPartyBillingSystem =new ThirdPartyBillingSystem();

/*
* This Adapter method converts String Array employee information to ArrayList of Employees
*
*/

@Override
public void processCompanySalary( String[][] employeeInfo )
{
String empId = null;
String name = null;
String designation = null;
ArrayList<Employee> employeeList = new ArrayList<Employee>();
for( int i = 0; i < employeeInfo.length; i++ )
{

for( int j = 0; j < employeeInfo[i].length; j++ )
{
if( j == 0 )
{
empId = employeeInfo[i][j];
}
else if( j == 1 )
{
name = employeeInfo[i][j];
}
else
{
designation = employeeInfo[i][j];
}
}
employeeList.add(new Employee(Integer.parseInt(empId), name, designation));

}

System.out.println("Adapter converted Array of Employee to ArrayList of Employee : \n"+employeeList+"\n"+
"then delegate to the ThirdPartyBillingSystem for processing the employee salary");
thirdPartyBillingSystem.processSalary(employeeList);


}

}

HumanResourceSystem.java

/*
 * Client System which has employee information as String Array
 *
 */

public class HumanResourceSystem
{

public static String[][] getEmployees()
{
String[][] employees = new String[4][];

employees[0] = new String[] { "100", "Dave", "Team Leader" };
employees[1] = new String[] { "101", "Ram", "Developer" };
employees[2] = new String[] { "102", "Raj", "Developer" };
employees[3] = new String[] { "103", "Rahul", "Tester" };

return employees;
}

public static void main( String args[] )
{

ITarget target = new EmployeeAdapter();
System.out.println("HR system passes employee string array to Adapter\n");
target.processCompanySalary(getEmployees());

}
}

Output

HR system passes employee string array to Adapter

Adapter converted Array of Employee to ArrayList of Employee :
[Employee [empId=100, name=Dave, designation=Team Leader], Employee [empId=101, name=Ram, designation=Developer], Employee [empId=102, name=Raj, designation=Developer], Employee [empId=103, name=Rahul, designation=Tester]]
then delegate to the ThirdPartyBillingSystem for processing the employee salary

Employee [empId=100, name=Dave, designation=Team Leader] : 70000Rs Salary credited to Dave Account


Employee [empId=101, name=Ram, designation=Developer] : 40000Rs Salary credited to Ram Account


Employee [empId=102, name=Raj, designation=Developer] : 40000Rs Salary credited to Raj Account


Employee [empId=103, name=Rahul, designation=Tester] : 30000Rs Salary credited to Rahul Account


See also:

Adapter Design pattern - Introduction

Adapter Design Pattern - Real Time Exmaple(Translator)

Adapter Design pattern - Real Time Example (Card Reader)

Adapter Design pattern - Real Time Example (Mobile Charger)

Adapter Design pattern - Real Time Example (Universal Adaptor)

Adapter Design pattern - Real Time Example [JDBC Driver]

Adapter Design pattern - Class diagram

Adapter Design Pattern - Sequence diagram

Adapter Design Pattern - Implementation [Language Translator]

Adapter Pattern - Implementation [Class Adapter]

Adapter Design Pattern - Implementation [Mobile Charger]

Adapter Design Pattern - Key Points

All Design Patterns Links