[JAVA>Diff]Sample program how to use Java's diff Library(JRCS Library)

Sample program how to use Java's diff Library and output difference between 2 arrays.
(There are some diff libraries written in Java, but in this case, I use JRCS diff library.)

Java Diff Library References

• JRCS Home
  http://www.suigeneris.org/kb/display/jrcs/JRCS+Home
• Other Diff Libraries written in Java
  http://www.incava.org/projects/java/
• Diff Libraries written in JavaScript
  http://ejohn.org/projects/javascript-diff-algorithm/
• Other References
• http://amateras.sourceforge.jp/cgi-bin/fswiki/wiki.cgi/free?page=JRCS
• Wikipedia Diff
  http://ja.wikipedia.org/wiki/Diff
  

Installations

1. Download the latest JRCS Library jar file.
   http://www.suigeneris.org/kb/display/jrcs/JRCS+Home#JRCSHome-Downlodables
2. Unzip the latest zip file
3. get org.suigeneris.jrcs.diff-(version number).jar file from unzipped files.
   

Sample Program

• Import classes
  

  import org.suigeneris.jrcs.diff.simple.SimpleDiff;
  import org.suigeneris.jrcs.diff.DiffAlgorithm;
  import org.suigeneris.jrcs.diff.Diff;
  import org.suigeneris.jrcs.diff.Revision;
  import org.suigeneris.jrcs.diff.delta.Delta;
  import org.suigeneris.jrcs.diff.delta.Chunk;
  import org.suigeneris.jrcs.diff.DifferentiationFailedException;
  import org.suigeneris.jrcs.util.ToString;
  

• Program
  

  public void DiffTest(){
   try{
    //Initializing diff algorithm, in this sample, use SimpleDiff Algorithm
    DiffAlgorithm algorithm=new SimpleDiff();
     
    //Create 2 arrays to output sample difference
    String[] origs=new String[]{"one","two","three","four","five"};
    String[] revised=new String[]{"two","four"};
  
    //Create new Diff Object
    //first argument is original array, second argument is algorithm object.
    Diff difference=new Diff(origs,algorithm);
    //Call diff() method for Diff Object with new array you want to get difference between original
    Revision rev=difference.diff(revised);
     
    //Output difference between original and revised arrays to use Revision's toString()
    System.out.println(rev.toString());
    /*
     Sample output of revision's toString()
     1d0
     < one
     3d1
     < three
     5d2
     < five
    */
     
    System.out.println(rev.toRCSString());
    /*
     Sample Output of revision's toRCSString()
     d1 1
     d3 1
     d5 1
    */
    
    //get all positions and information existing the difference
    System.out.println("**********Diff Delta**********");
    for(int i=0;i<rev.size();i++){
     Delta delta=rev.getDelta(i);
     Chunk origChunk=delta.getOriginal();
     Chunk revisedChunk=delta.getRevised();
     System.out.println("delta="+delta.toString());
     System.out.println("orig range   ="+origChunk.rangeString());
     System.out.println("revised range="+revisedChunk.rangeString());
    }
    /*
     Sample Output of delta
     **********Diff Delta**********
     delta=1d0
     < one
    
     orig range   =0
     revised range=0
     
     delta=3d1
     < three
     
     orig range   =2
     revised range=1
     
     delta=5d2
     < five
     
     orig range   =4
     revised range=2
    */
   }catch(DifferentiationFailedException eDifferentiationFailed){
    //sometimes throw Exception in Diff.diff() method
    System.out.println("Exception occured, pos:1, e="+eDifferentiationFailed);
   }
  }