| /* |
| * Copyright (C) 2017, Google Inc. and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| package org.eclipse.jgit.internal.revwalk; |
| |
| import org.eclipse.jgit.lib.BitmapIndex.Bitmap; |
| import org.eclipse.jgit.lib.BitmapIndex.BitmapBuilder; |
| import org.eclipse.jgit.lib.Constants; |
| import org.eclipse.jgit.revwalk.filter.RevFilter; |
| import org.eclipse.jgit.revwalk.RevWalk; |
| import org.eclipse.jgit.revwalk.RevCommit; |
| import org.eclipse.jgit.revwalk.RevFlag; |
| |
| /** |
| * A RevFilter that adds the visited commits to {@code bitmap} as a side |
| * effect. |
| * <p> |
| * When the walk hits a commit that is part of {@code bitmap}'s |
| * BitmapIndex, that entire bitmap is ORed into {@code bitmap} and the |
| * commit and its parents are marked as SEEN so that the walk does not |
| * have to visit its ancestors. This ensures the walk is very short if |
| * there is good bitmap coverage. |
| * <p> |
| * Commits named in {@code seen} are considered already seen. If one is |
| * encountered, that commit and its parents will be marked with the SEEN |
| * flag to prevent the walk from visiting its ancestors. |
| */ |
| public class AddUnseenToBitmapFilter extends RevFilter { |
| private final BitmapBuilder seen; |
| private final BitmapBuilder bitmap; |
| |
| /** |
| * Create a filter that adds visited commits to the given bitmap, but does not walk |
| * through the objects in {@code seen}. |
| * |
| * @param seen objects that are already seen |
| * @param bitmap bitmap to write visited commits to |
| */ |
| public AddUnseenToBitmapFilter(BitmapBuilder seen, BitmapBuilder bitmap) { |
| this.seen = seen; |
| this.bitmap = bitmap; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public final boolean include(RevWalk walker, RevCommit cmit) { |
| Bitmap visitedBitmap; |
| |
| if (seen.contains(cmit) || bitmap.contains(cmit)) { |
| // already seen or included |
| } else if ((visitedBitmap = bitmap.getBitmapIndex() |
| .getBitmap(cmit)) != null) { |
| bitmap.or(visitedBitmap); |
| } else { |
| bitmap.addObject(cmit, Constants.OBJ_COMMIT); |
| return true; |
| } |
| |
| for (RevCommit p : cmit.getParents()) { |
| p.add(RevFlag.SEEN); |
| } |
| return false; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public final RevFilter clone() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public final boolean requiresCommitBody() { |
| return false; |
| } |
| } |