Java tutorial
package model; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.List; import java.util.TimeZone; import org.eclipse.jgit.api.Git; import org.eclipse.jgit.api.errors.GitAPIException; import org.eclipse.jgit.api.errors.NoHeadException; import org.eclipse.jgit.diff.DiffEntry; import org.eclipse.jgit.diff.DiffFormatter; import org.eclipse.jgit.diff.RawText; import org.eclipse.jgit.errors.RevisionSyntaxException; import org.eclipse.jgit.lib.ObjectId; import org.eclipse.jgit.lib.ObjectReader; import org.eclipse.jgit.lib.PersonIdent; import org.eclipse.jgit.revwalk.RevCommit; import org.eclipse.jgit.lib.Repository; import org.eclipse.jgit.treewalk.CanonicalTreeParser; import settings.RepoSettings; public class Buildmodel { public int build(Git git, List<RevCommit> logs, RepoSettings rs) throws NoHeadException, GitAPIException, IOException { //ObjectId lastCommitId = repository.resolve(Constants.MASTER); ObjectId parentid = null; ObjectId currid = null; Repository repository = git.getRepository(); //a new reader to read objects from getObjectDatabase() ObjectReader reader = repository.newObjectReader(); CanonicalTreeParser oldTreeIter = new CanonicalTreeParser(); CanonicalTreeParser newTreeIter = new CanonicalTreeParser(); List<DiffEntry> diffs = null; WriteData wd = new WriteData(); //Class to write data to an external file wd.initiate(rs); int cnt = 0; //Commits count that is written in data for (RevCommit rev : logs) { if (rev.getParentCount() == 1) { //Not taking Merge commits, for taking them make it >= . try { parentid = repository.resolve(rev.getParent(0).getName() + "^{tree}"); currid = repository.resolve(rev.getName() + "^{tree}"); //Reset this parser to walk through the given tree oldTreeIter.reset(reader, parentid); newTreeIter.reset(reader, currid); diffs = git.diff() //Returns a command object to execute a diff command .setNewTree(newTreeIter).setOldTree(oldTreeIter).call(); //returns a DiffEntry for each path which is different } catch (RevisionSyntaxException | IOException | GitAPIException e) { e.printStackTrace(); } ByteArrayOutputStream out = new ByteArrayOutputStream(); //Create a new formatter with a default level of context. DiffFormatter df = new DiffFormatter(out); //Set the repository the formatter can load object contents from. df.setRepository(git.getRepository()); ArrayList<String> diffText = new ArrayList<String>(); ArrayList<String> filetypes = new ArrayList<String>(); //A DiffEntry is 'A value class representing a change to a file' therefore for each file you have a diff entry. int ovllineadd = 0; int ovllinerem = 0; int totallinechanged = 0; int totalfilrem = 0; int totalfiladd = 0; for (DiffEntry diff : diffs) { try { df.format(diff); //Format a patch script for one file entry. RawText r = new RawText(out.toByteArray()); r.getLineDelimiter(); diffText.add(out.toString()); String st = out.toString(); String filetype = null; int filerem = 0, fileadd = 0, filtyp = 0; ; int lineadd = 0, linerem = 0; String[] temp = st.split("\n"); for (String tem : temp) { if (tem.startsWith("---") || tem.startsWith("+++")) { if (tem.startsWith("---")) { if (tem.endsWith("null")) { fileadd++; //File added } else { int p = tem.lastIndexOf("/"); if (p >= 0) { tem = tem.substring(p + 1, tem.length()); } int h = tem.lastIndexOf("."); if (h >= 0) { filetype = tem.substring(h, tem.length()); filetype = filetype.replace(" ", ""); filetype = filetype.replace("\"", ""); if (filtyp != 1) { filetypes.add(filetype); filtyp = 1; } } else { //README, LICENSE type wanna do? } } } if (tem.startsWith("+++")) { if (tem.endsWith("null")) { filerem++; //Fil removed } else { int p = tem.lastIndexOf("/"); if (p >= 0) { tem = tem.substring(p + 1, tem.length()); } int h = tem.lastIndexOf("."); if (h >= 0) { filetype = tem.substring(h, tem.length()); filetype = filetype.replace(" ", ""); filetype = filetype.replace("\"", ""); if (filtyp != 1) { filetypes.add(filetype); filtyp = 1; } } else { //README, LICENSE type wanna do? } } } } if (tem.startsWith("+") && !tem.startsWith("+++")) { lineadd++; } else if (tem.startsWith("-") && !tem.startsWith("---")) { linerem++; } } ovllineadd += lineadd; ovllinerem += linerem; totallinechanged += (lineadd + linerem); totalfiladd += fileadd; totalfilrem += filerem; out.reset(); } catch (IOException e) { e.printStackTrace(); } } PersonIdent p = rev.getAuthorIdent(); //DateFormat formatter= new SimpleDateFormat("MM/dd/yyyy HH:mm:ss"); DateFormat formatter = new SimpleDateFormat("HH"); formatter.setTimeZone(TimeZone.getTimeZone("UTC")); String email = p.getEmailAddress(); //So that email folder is created properly if (email.contains("://") || email.contains("//")) { email = email.replace(":", ""); email = email.replace("//", ""); } String[] commsgwords = rev.getFullMessage().split(" "); wd.write(rev.getName(), email, totallinechanged, ovllineadd, ovllinerem, filetypes.size(), totalfiladd, totalfilrem, Integer.parseInt(formatter.format(p.getWhen())), filetypes, commsgwords.length); cnt++; } } repository.close(); return cnt; } }