getgitdata.JGitDiff.java Source code

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Here is the source code for getgitdata.JGitDiff.java

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/*
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 */
package getgitdata;

/**
 *
 * @author Masud
 */

/** Copyright Steve Jin 2013 */
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.util.List;

import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.diff.DiffEntry;
import org.eclipse.jgit.diff.DiffFormatter;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.treewalk.CanonicalTreeParser;

public class JGitDiff {
    public static void main(String[] args) throws Exception {
        File gitWorkDir = new File("C:/Users/Masud/Documents/GitHub/tomcat");
        Git git = Git.open(gitWorkDir);

        String newHash = "278a36a";
        String oldHash = "1b46e37b92705159ddc22fd8a28ee1d2b7499072";

        //ObjectId headId = git.getRepository().resolve("HEAD^{tree}");
        // ObjectId headId = git.getRepository().resolve(newHash + "^{tree}");
        ObjectId headId = git.getRepository().resolve(newHash + "^{tree}");
        ObjectId oldId = git.getRepository().resolve(newHash + "^^{tree}");
        ObjectReader reader = git.getRepository().newObjectReader();

        CanonicalTreeParser oldTreeIter = new CanonicalTreeParser();
        oldTreeIter.reset(reader, oldId);
        CanonicalTreeParser newTreeIter = new CanonicalTreeParser();
        newTreeIter.reset(reader, headId);

        List<DiffEntry> diffs = git.diff().setNewTree(newTreeIter).setOldTree(oldTreeIter).call();

        ByteArrayOutputStream out = new ByteArrayOutputStream();
        DiffFormatter df = new DiffFormatter(out);
        df.setRepository(git.getRepository());
        int count = 0;
        for (DiffEntry diff : diffs) {
            count++;
            System.out.println("DIff: " + diff.toString());
            df.format(diff);

            // diff.getOldId();
            String diffText = out.toString("UTF-8");
            System.out.println(diffText);
            out.reset();
        }
        System.out.println("Count: " + count);
    }
}