Saturday, 1 February 2014

State Design pattern - Implementation [Project]




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State Design pattern - Implementation [Project]


State Design pattern - Implementation [Project] - Class Diagram












































ProjectState.java

public interface ProjectState
{

public void doRequirmentGathering();

public void doDesignAndArchitecture();

public void doDevelopement();

public void doTesting();


}

RequirementGatheringState.java

public class RequirementGatheringState implements ProjectState
{

@Override
public void doRequirmentGathering()
{
System.out.println("'RequirmentGathering' has been started .............");

System.out.println("'RequirmentGathering' has been finished by 7 days .............");

}

@Override
public void doDesignAndArchitecture()
{
System.out.println("Cannot do 'DesignAndArchitecture' because Project is in 'RequirmentGathering' Phase...");

}

@Override
public void doDevelopement()
{
System.out.println("Cannot do 'developement' because Project is in 'RequirmentGathering' Phase...");

}

@Override
public void doTesting()
{
System.out.println("Cannot do 'Testing' because Project is in 'RequirmentGathering' Phase...");

}

}

DesignAndArchitectureState.java

public class DesignAndArchitectureState implements ProjectState
{
@Override
public void doRequirmentGathering()
{
System.out.println("'RequirmentGathering'[Clarification of Requirement] you can do in ''DesignAndArchitecture'' Phase .......");
}

@Override
public void doDesignAndArchitecture()
{
System.out.println("'DesignAndArchitecture' has been started .............");

System.out.println("'DesignAndArchitecture' has been finished by 10 days .............");
}

@Override
public void doDevelopement()
{
System.out.println("Cannot do 'developement' because Project is in 'DesignAndArchitecture' Phase...");

}

@Override
public void doTesting()
{
System.out.println("Cannot do 'Testing' because Project is in 'DesignAndArchitecture' Phase...");

}

}

DevelopementState.java

public class DevelopementState implements ProjectState
{
@Override
public void doRequirmentGathering()
{
System.out.println("Cannot do 'RequirmentGathering' because Project is in 'Developement' Phase...");
}

@Override
public void doDesignAndArchitecture()
{
System.out.println("'DesignAndArchitecture'[Clarification of DesignAndArchitecture] you can do in ''Developement'' Phase .......");
}

@Override
public void doDevelopement()
{
System.out.println("'Developement' has been started .............");

System.out.println("'Developement' has been finished by 40 days .............");

}

@Override
public void doTesting()
{
System.out.println("Cannot do 'Testing' because Project is in 'Developement' Phase...");

}

}

TestingState.java

public class TestingState implements ProjectState
{
@Override
public void doRequirmentGathering()
{
System.out.println("Cannot do 'RequirmentGathering' because Project is in 'Testing' Phase...");
}

@Override
public void doDesignAndArchitecture()
{
System.out.println("Cannot do 'DesignAndArchitecture' because Project is in 'Testing' Phase...");
}

@Override
public void doDevelopement()
{
System.out.println("'Developement'[Bug fixes] you can do in ''Testing'' Phase .......");

}

@Override
public void doTesting()
{
System.out.println("'Testing' has been started .............");

System.out.println("'Testing' has been finished by 20 days .............");

}

}

Project.java

// This is like Context
public class Project implements ProjectState
{

private ProjectState projectState;

public Project()
{
projectState = new RequirementGatheringState();
}

public ProjectState getProjectState()
{
return projectState;
}

public void setProjectState( ProjectState projectState )
{
this.projectState = projectState;
}

@Override
public void doRequirmentGathering()
{
projectState.doRequirmentGathering();
/*
* Once RequirmentGathering is finished project internal state
* will be moved to DesignAndArchitectureState
*/
if( projectState instanceof RequirementGatheringState )
{
setProjectState(new DesignAndArchitectureState());
System.out.println("\nProject internal state moved to : " + projectState.getClass().getName() +"\n" );
}

}

@Override
public void doDesignAndArchitecture()
{
projectState.doDesignAndArchitecture();

/*
* Once DesignAndArchitecture is finished project internal state
* will be moved to DevelopementState
*/
if( projectState instanceof DesignAndArchitectureState )
{
setProjectState(new DevelopementState());
System.out.println("\nProject internal state moved to : " + projectState.getClass().getName() +"\n" );
}

}

@Override
public void doDevelopement()
{
projectState.doDevelopement();

/*
* Once Developement is finished project internal state will be
* moved to TestingState
*/

if( projectState instanceof DevelopementState )
{
setProjectState(new TestingState());
System.out.println("\nProject internal state moved to : " + projectState.getClass().getName() +"\n" );
}

}

@Override
public void doTesting()
{
projectState.doTesting();

}

}

Client.java

public class Client
{

public static void main( String[] args )
{
/*
* Initially Project in 'RequirementGatheringState'
*/
Project project = new Project();

System.out.println("Project internal state is  : " + project.getProjectState().getClass().getName()+"\n");

project.doDesignAndArchitecture();
project.doDevelopement();
project.doTesting();
project.doRequirmentGathering();

System.out.println();

project.doDesignAndArchitecture();
project.doTesting();
project.doDevelopement();
project.doRequirmentGathering();

}

}

Output

Project internal state is  : RequirementGatheringState

Cannot do 'DesignAndArchitecture' because Project is in 'RequirmentGathering' Phase...
Cannot do 'developement' because Project is in 'RequirmentGathering' Phase...
Cannot do 'Testing' because Project is in 'RequirmentGathering' Phase...
'RequirmentGathering' has been started .............
'RequirmentGathering' has been finished by 7 days .............

Project internal state moved to : DesignAndArchitectureState


'DesignAndArchitecture' has been started .............
'DesignAndArchitecture' has been finished by 10 days .............

Project internal state moved to : DevelopementState

Cannot do 'Testing' because Project is in 'Developement' Phase...
'Developement' has been started .............
'Developement' has been finished by 40 days .............

Project internal state moved to : TestingState

Cannot do 'RequirmentGathering' because Project is in 'Testing' Phase...

See also:

  • State Design pattern - Introduction
  • State Design pattern - Real time example [ATM]
  • State Design pattern - Real time example [TV Remote]
  • State Design pattern - Real time example [Vending Machine]
  • State Design pattern - Real time example [Project]
  • State Design pattern - Class Diagram
  • State Design pattern - Implementation [ATM]
  • State Design pattern - Implementation [Vending Machine]
  • State Design pattern - Implementation [LED TV]
  • State Design pattern - Keypoints
  • All Design Patterns Links
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