Tuesday, 24 December 2013

Strategy Design pattern - Implementation [Compress files]



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Strategy Design pattern - Implementation [Compress files]

Strategy Design pattern - Implementation [Compress files] - Class Diagram

CompressionStrategy.java

import java.io.File;
import java.util.ArrayList;

public interface CompressionStrategy
{
public void compressFiles( ArrayList<File> files,String compressedArchiveFileName );
}


ZipCompressionStrategy.java

import java.io.File;
import java.util.ArrayList;

public class ZipCompressionStrategy implements CompressionStrategy
{

public void compressFiles( ArrayList<File> files, String compressedArchiveFileName )
{
System.out.println("Files are compressed using zip approach: '" + compressedArchiveFileName
               + ".zip' file is created");
}

}

RarCompressionStrategy.java

import java.io.File;
import java.util.ArrayList;

public class RarCompressionStrategy implements CompressionStrategy
{

public void compressFiles( ArrayList<File> files, String compressedArchiveFileName )
{
System.out.println("Files are compressed using Rar approach: '" + compressedArchiveFileName
               + ".rar' file is created");
}

}

CompressionContext.java

import java.io.File;
import java.util.ArrayList;

public class CompressionContext
{
private CompressionStrategy strategy;

//Client will set what CompressionStrategy to use by calling this method
public void setCompressionStrategy( CompressionStrategy strategy )
{
this.strategy = strategy;
}

public void createArchive( ArrayList<File> files,String compressedArchiveFileName )
{
strategy.compressFiles(files,compressedArchiveFileName);
}

}

Client.java

import java.io.File;
import java.util.ArrayList;

public class Client
{

public static void main( String[] args )
{

ArrayList<File> fileList = new ArrayList<File>();
fileList.add(new File("D:\\Javafiles\\Javadoc.txt"));
fileList.add(new File("D:\\Javafiles\\Release.txt"));

CompressionContext ctx = null;

ctx = new CompressionContext();
ctx.setCompressionStrategy(new ZipCompressionStrategy());
ctx.createArchive(fileList,"Javafiles");

ctx = new CompressionContext();
ctx.setCompressionStrategy(new RarCompressionStrategy());
ctx.createArchive(fileList,"Javafiles");

}
}

Output

Files are compressed using zip approach: 'Javafiles.zip' file is created
Files are compressed using Rar approach: 'Javafiles.rar' file is created


See also:

  • Strategy Design pattern - Introduction
  • Strategy Design pattern - Real Time Example [Compress files]
  • Strategy Design pattern - Real Time Example [Payment]
  • Strategy Design pattern - Real Time Example [Travel]
  • Strategy Design pattern - Real Time Example [Sorting]
  • Strategy Design pattern - Real Time Example [Search]
  • Strategy Design pattern - Class Diagram
  • Strategy Design pattern - Sequence Diagram
  • Strategy Design pattern - Implementation [Travel]
  • Strategy Design pattern - Implementation [Payment]
  • Strategy Design pattern - Implementation [Search]
  • Strategy Design pattern - Implementation [Sort]
  • Strategy Design pattern - KeyPoints
  • All Design Patterns Links
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