Beispiel #1
0
 private boolean reverseResult(Candidate parent, Candidate source) throws IOException {
   // On a reverse blame present the application the parent
   // (as this is what did the removals), however the region
   // list to enumerate is the source's surviving list.
   Candidate res = parent.copy(parent.sourceCommit);
   res.regionList = source.regionList;
   return result(res);
 }
Beispiel #2
0
  private boolean processMerge(Candidate n) throws IOException {
    int pCnt = n.getParentCount();

    // If any single parent exactly matches the merge, follow only
    // that one parent through history.
    ObjectId[] ids = null;
    for (int pIdx = 0; pIdx < pCnt; pIdx++) {
      RevCommit parent = n.getParent(pIdx);
      revPool.parseHeaders(parent);
      if (!find(parent, n.sourcePath)) continue;
      if (!(n instanceof ReverseCandidate) && idBuf.equals(n.sourceBlob))
        return blameEntireRegionOnParent(n, parent);
      if (ids == null) ids = new ObjectId[pCnt];
      ids[pIdx] = idBuf.toObjectId();
    }

    // If rename detection is enabled, search for any relevant names.
    DiffEntry[] renames = null;
    if (renameDetector != null) {
      renames = new DiffEntry[pCnt];
      for (int pIdx = 0; pIdx < pCnt; pIdx++) {
        RevCommit parent = n.getParent(pIdx);
        if (ids != null && ids[pIdx] != null) continue;

        DiffEntry r = findRename(parent, n.sourceCommit, n.sourcePath);
        if (r == null) continue;

        if (n instanceof ReverseCandidate) {
          if (ids == null) ids = new ObjectId[pCnt];
          ids[pCnt] = r.getOldId().toObjectId();
        } else if (0 == r.getOldId().prefixCompare(n.sourceBlob)) {
          // A 100% rename without any content change can also
          // skip directly to the parent. Note this bypasses an
          // earlier parent that had the path (above) but did not
          // have an exact content match. For performance reasons
          // we choose to follow the one parent over trying to do
          // possibly both parents.
          n.sourcePath = PathFilter.create(r.getOldPath());
          return blameEntireRegionOnParent(n, parent);
        }

        renames[pIdx] = r;
      }
    }

    // Construct the candidate for each parent.
    Candidate[] parents = new Candidate[pCnt];
    for (int pIdx = 0; pIdx < pCnt; pIdx++) {
      RevCommit parent = n.getParent(pIdx);

      Candidate p;
      if (renames != null && renames[pIdx] != null) {
        p = n.create(parent, PathFilter.create(renames[pIdx].getOldPath()));
        p.renameScore = renames[pIdx].getScore();
        p.sourceBlob = renames[pIdx].getOldId().toObjectId();
      } else if (ids != null && ids[pIdx] != null) {
        p = n.create(parent, n.sourcePath);
        p.sourceBlob = ids[pIdx];
      } else {
        continue;
      }

      EditList editList;
      if (n instanceof ReverseCandidate && p.sourceBlob.equals(n.sourceBlob)) {
        // This special case happens on ReverseCandidate forks.
        p.sourceText = n.sourceText;
        editList = new EditList(0);
      } else {
        p.loadText(reader);
        editList = diffAlgorithm.diff(textComparator, p.sourceText, n.sourceText);
      }

      if (editList.isEmpty()) {
        // Ignoring whitespace (or some other special comparator) can
        // cause non-identical blobs to have an empty edit list. In
        // a case like this push the parent alone.
        if (n instanceof ReverseCandidate) {
          parents[pIdx] = p;
          continue;
        }

        p.regionList = n.regionList;
        n.regionList = null;
        parents[pIdx] = p;
        break;
      }

      p.takeBlame(editList, n);

      // Only remember this parent candidate if there is at least
      // one region that was blamed on the parent.
      if (p.regionList != null) {
        // Reverse blame requires inverting the regions. This puts
        // the regions the parent deleted from us into the parent,
        // and retains the common regions to look at other parents
        // for deletions.
        if (n instanceof ReverseCandidate) {
          Region r = p.regionList;
          p.regionList = n.regionList;
          n.regionList = r;
        }

        parents[pIdx] = p;
      }
    }

    if (n instanceof ReverseCandidate) {
      // On a reverse blame report all deletions found in the children,
      // and pass on to them a copy of our region list.
      Candidate resultHead = null;
      Candidate resultTail = null;

      for (int pIdx = 0; pIdx < pCnt; pIdx++) {
        Candidate p = parents[pIdx];
        if (p == null) continue;

        if (p.regionList != null) {
          Candidate r = p.copy(p.sourceCommit);
          if (resultTail != null) {
            resultTail.queueNext = r;
            resultTail = r;
          } else {
            resultHead = r;
            resultTail = r;
          }
        }

        if (n.regionList != null) {
          p.regionList = n.regionList.deepCopy();
          push(p);
        }
      }

      if (resultHead != null) return result(resultHead);
      return false;
    }

    // Push any parents that are still candidates.
    for (int pIdx = 0; pIdx < pCnt; pIdx++) {
      if (parents[pIdx] != null) push(parents[pIdx]);
    }

    if (n.regionList != null) return result(n);
    return false;
  }