Saturday, 25 January 2014

Bridge Design pattern - Implementation [Send Message]



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Bridge Design pattern - Implementation [Send Message]














Bridge Design pattern - Implementation [Send Message] - Class Diagram



















MessageSender.java


public interface MessageSender
{
public void sendMessage(String message);
}

SmsMessageSender.java

public class SmsMessageSender implements MessageSender
{
public void sendMessage(String message)
{
System.out.println("'"+message+ "'   : This Message has been sent using SMS");
}
}

EmailMessageSender.java

public class EmailMessageSender implements MessageSender
{
public void sendMessage(String message)
{
System.out.println("'"+message+ "'   : This Message has been sent using Email");
}
}

Message.java

abstract class Message
{
protected MessageSender messageSender;

abstract public void sendMessage(String message);

}

ShortMessage.java

public class ShortMessage extends Message
{
public ShortMessage(MessageSender messageSender)
{
super.messageSender = messageSender;
}
@Override
public void sendMessage(String message)
{
if(message.length()<=5)
{
messageSender.sendMessage(message);
}
else
{
System.out.println("Sorry cannot send the message.....");
}
}

}

LongMessage.java

public class LongMessage extends Message
{

public LongMessage(MessageSender messageSender)
{
super.messageSender = messageSender;
}

@Override
public void sendMessage(String message)
{
messageSender.sendMessage(message);
}

}

Client.java

import java.util.Scanner;

public class Client
{

public static void main(String[] args)
{

System.out.println("Do you want to send 'longmessage' or 'shortmessage' ?");
Scanner scanner = new Scanner(System.in);
String messageType = scanner.next();

System.out.println("Please enter the message you want to send");
Scanner scanner1 = new Scanner(System.in);
String message = scanner1.nextLine();
if (messageType.equalsIgnoreCase("longmessage"))
{
Message longMessage = new LongMessage(new EmailMessageSender());
longMessage.sendMessage(message);
}
else
{
Message shortMessage = new ShortMessage(new SmsMessageSender());
shortMessage.sendMessage(message);
}

}
}

Output

Do you want to send 'longmessage' or 'shortmessage' ?
longmessage
Please enter the message you want to send
Hello how are you ? when did you come?
'Hello how are you ? when did you come?'   : This Message has been sent using Email

Do you want to send 'longmessage' or 'shortmessage' ?
shortmessage
Please enter the message you want to send
hi
'hi'   : This Message has been sent using SMS

See also:

  • Bridge Design pattern - Introduction
  • Bridge Design pattern - Real time example [Send Message]
  • Bridge Design pattern - Real time example [Publish Message]
  • Bridge Design pattern - Real time example [Shape]
  • Bridge Design pattern - Real time example [TV]
  • Bridge Design pattern - Class Diagram
  • Bridge Design pattern - Implementation [Shape]
  • Bridge Design pattern - Implementation [Publish Message]
  • Bridge Design pattern - Implementation [LED TV]
  • Bridge Design pattern - Keypoints
  • All Design Patterns Links
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