Examples of org.eclipse.jgit.revwalk.RevWalk

org.eclipse.jgit.revwalk.RevWalk
Walks a commit graph and produces the matching commits in order.
A RevWalk instance can only be used once to generate results. Running a second time requires creating a new RevWalk instance, or invoking {@link #reset()} before starting again. Resetting an existing instance may befaster for some applications as commit body parsing can be avoided on the later invocations.
RevWalk instances are not thread-safe. Applications must either restrict usage of a RevWalk instance to a single thread, or implement their own synchronization at a higher level.
Multiple simultaneous RevWalk instances per {@link Repository} are permitted,even from concurrent threads. Equality of {@link RevCommit}s from two different RevWalk instances is never true, even if their {@link ObjectId}s are equal (and thus they describe the same commit).
The offered iterator is over the list of RevCommits described by the configuration of this instance. Applications should restrict themselves to using either the provided Iterator or {@link #next()}, but never use both on the same RevWalk at the same time. The Iterator may buffer RevCommits, while {@link #next()} does not.

    }


    try {
      final Repository repo = repoManager.openRepository(projectName);
      try {
        final RevWalk rw = new RevWalk(repo);
        try {
          return rFilter.include(rw, rw.parseCommit(objectId));
        } finally {
          rw.release();
        }
      } finally {
        repo.close();
      }
    } catch (RepositoryNotFoundException e) {

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    // Total number of commits to extract from the history.
    final int max = maxExtraSize / haveLineLen;


    // Scan history until the advertisement is full.
    Set<ObjectId> alreadySending = rp.getAdvertisedObjects();
    RevWalk rw = rp.getRevWalk();
    for (ObjectId haveId : alreadySending) {
      try {
        rw.markStart(rw.parseCommit(haveId));
      } catch (IOException badCommit) {
        continue;
      }
    }


    int stepCnt = 0;
    RevCommit c;
    try {
      while ((c = rw.next()) != null && toInclude.size() < max) {
        if (alreadySending.contains(c)) {
        } else if (toInclude.contains(c)) {
        } else if (c.getParentCount() > 1) {
        } else if (toInclude.size() < base) {
          toInclude.add(c);
        } else {
          stepCnt = ++stepCnt % step;
          if (stepCnt == 0) {
            toInclude.add(c);
          }
        }
      }
    } catch (IOException err) {
      log.error("Error trying to advertise history on " + project.getNameKey(), err);
    }
    rw.reset();
    rp.getAdvertisedObjects().addAll(toInclude);
  }

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    private TreeWalk find(final ObjectId within) throws MissingObjectException,
        IncorrectObjectTypeException, CorruptObjectException, IOException {
      if (path == null || within == null) {
        return null;
      }
      final RevWalk rw = new RevWalk(reader);
      final RevTree tree = rw.parseTree(within);
      return TreeWalk.forPath(reader, path, tree);
    }

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    // branch.  If they aren't, we want to abort. We do this check by
    // looking to see if we can compute a merge base between the new
    // commits and the target branch head.
    //
    try {
      final RevWalk walk = rp.getRevWalk();


      final RevCommit tip = walk.parseCommit(newChange.getNewId());
      Ref targetRef = rp.getAdvertisedRefs().get(destBranchName);
      if (targetRef == null || targetRef.getObjectId() == null) {
        // The destination branch does not yet exist. Assume the
        // history being sent for review will start it and thus
        // is "connected" to the branch.
        return;
      }
      final RevCommit h = walk.parseCommit(targetRef.getObjectId());


      final RevFilter oldRevFilter = walk.getRevFilter();
      try {
        walk.reset();
        walk.setRevFilter(RevFilter.MERGE_BASE);
        walk.markStart(tip);
        walk.markStart(h);
        if (walk.next() == null) {
          reject(newChange, "no common ancestry");
          return;
        }
      } finally {
        walk.reset();
        walk.setRevFilter(oldRevFilter);
      }
    } catch (IOException e) {
      newChange.setResult(REJECTED_MISSING_OBJECT);
      log.error("Invalid pack upload; one or more objects weren't sent", e);
      return;

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      Ref ref = repo.getRef(GitRepositoryManager.REF_REJECT_COMMITS);
      if (ref == null) {
        return NoteMap.newEmptyMap();
      }


      RevWalk rw = rp.getRevWalk();
      RevCommit map = rw.parseCommit(ref.getObjectId());
      return NoteMap.read(rw.getObjectReader(), map);
    } catch (IOException badMap) {
      throw new IOException("Cannot load "
          + GitRepositoryManager.REF_REJECT_COMMITS, badMap);
    }
  }

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    return true;
  }


  private void createNewChanges() {
    final List<RevCommit> toCreate = new ArrayList<RevCommit>();
    final RevWalk walk = rp.getRevWalk();
    walk.reset();
    walk.sort(RevSort.TOPO);
    walk.sort(RevSort.REVERSE, true);
    try {
      walk.markStart(walk.parseCommit(newChange.getNewId()));
      for (ObjectId id : existingObjects()) {
        try {
          walk.markUninteresting(walk.parseCommit(id));
        } catch (IOException e) {
          continue;
        }
      }


      final Set<Change.Key> newChangeIds = new HashSet<Change.Key>();
      for (;;) {
        final RevCommit c = walk.next();
        if (c == null) {
          break;
        }
        if (replaceByCommit.containsKey(c)) {
          // This commit was already scheduled to replace an existing PatchSet.

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    }
  }


  private boolean isMergedInto(final RevCommit commit, final Ref ref)
      throws IOException {
    final RevWalk rw = rp.getRevWalk();
    return rw.isMergedInto(commit, rw.parseCommit(ref.getObjectId()));
  }

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  public static final byte[] NO_BYTES = {};
  public static final Text EMPTY = new Text(NO_BYTES);


  public static Text forCommit(Repository db, ObjectReader reader,
      AnyObjectId commitId) throws IOException {
    RevWalk rw = new RevWalk(reader);
    RevCommit c;
    if (commitId instanceof RevCommit) {
      c = (RevCommit) commitId;
    } else {
      c = rw.parseCommit(commitId);
    }


    StringBuilder b = new StringBuilder();
    switch (c.getParentCount()) {
      case 0:
        break;
      case 1: {
        RevCommit p = c.getParent(0);
        rw.parseBody(p);
        b.append("Parent:     ");
        b.append(reader.abbreviate(p, 8).name());
        b.append(" (");
        b.append(p.getShortMessage());
        b.append(")\n");
        break;
      }
      default:
        for (int i = 0; i < c.getParentCount(); i++) {
          RevCommit p = c.getParent(i);
          rw.parseBody(p);
          b.append(i == 0 ? "Merge Of:   " : "            ");
          b.append(reader.abbreviate(p, 8).name());
          b.append(" (");
          b.append(p.getShortMessage());
          b.append(")\n");

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    ChangeMessage msg;
    String mergedIntoRef;
  }


  private void validateNewCommits(RefControl ctl, ReceiveCommand cmd) {
    final RevWalk walk = rp.getRevWalk();
    walk.reset();
    walk.sort(RevSort.NONE);
    try {
      walk.markStart(walk.parseCommit(cmd.getNewId()));
      for (ObjectId id : existingObjects()) {
        try {
          walk.markUninteresting(walk.parseCommit(id));
        } catch (IOException e) {
          continue;
        }
      }


      RevCommit c;
      while ((c = walk.next()) != null) {
        if (!validCommit(ctl, cmd, c)) {
          break;
        }
      }
    } catch (IOException err) {

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          + ": commit message lines >70 characters; manually wrap lines");
    }
  }


  private void autoCloseChanges(final ReceiveCommand cmd) {
    final RevWalk rw = rp.getRevWalk();
    try {
      rw.reset();
      rw.markStart(rw.parseCommit(cmd.getNewId()));
      if (!ObjectId.zeroId().equals(cmd.getOldId())) {
        rw.markUninteresting(rw.parseCommit(cmd.getOldId()));
      }


      final Map<ObjectId, Ref> byCommit = changeRefsById();
      final Map<Change.Key, Change.Id> byKey = openChangesByKey(
          new Branch.NameKey(project.getNameKey(), cmd.getRefName()));
      final List<ReplaceRequest> toClose = new ArrayList<ReplaceRequest>();
      RevCommit c;
      while ((c = rw.next()) != null) {
        final Ref ref = byCommit.get(c.copy());
        if (ref != null) {
          rw.parseBody(c);
          closeChange(cmd, PatchSet.Id.fromRef(ref.getName()), c);
          closeProgress.update(1);
        }


        rw.parseBody(c);
        for (final String changeId : c.getFooterLines(CHANGE_ID)) {
          final Change.Id onto = byKey.get(new Change.Key(changeId.trim()));
          if (onto != null) {
            toClose.add(new ReplaceRequest(onto, c, cmd, false));
            break;
          }
        }
      }


      for (final ReplaceRequest req : toClose) {
        final PatchSet.Id psi = doReplace(req, true);
        if (psi != null) {
          closeChange(req.cmd, psi, req.newCommit);
          closeProgress.update(1);
        }
      }


      // It handles gitlinks if required.


      rw.reset();
      final RevCommit codeReviewCommit = rw.parseCommit(cmd.getNewId());


      final SubmoduleOp subOp =
          subOpFactory.create(
              new Branch.NameKey(project.getNameKey(), cmd.getRefName()),
              codeReviewCommit, rw, repo, project, new ArrayList<Change>(),

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