| /* |
| * Copyright (c) 2020, Google LLC 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 |
| * http://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.lib.AnyObjectId; |
| 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 the same as {@code cachedCommit} or 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. |
| */ |
| public class AddToBitmapWithCacheFilter extends RevFilter { |
| private final AnyObjectId cachedCommit; |
| |
| private final Bitmap cachedBitmap; |
| |
| private final BitmapBuilder bitmap; |
| |
| /** |
| * Create a filter with a cached BitmapCommit that adds visited commits to |
| * the given bitmap. |
| * |
| * @param cachedCommit |
| * the cached commit |
| * @param cachedBitmap |
| * the bitmap corresponds to {@code cachedCommit}} |
| * @param bitmap |
| * bitmap to write visited commits to |
| */ |
| public AddToBitmapWithCacheFilter(AnyObjectId cachedCommit, |
| Bitmap cachedBitmap, |
| BitmapBuilder bitmap) { |
| this.cachedCommit = cachedCommit; |
| this.cachedBitmap = cachedBitmap; |
| this.bitmap = bitmap; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public final boolean include(RevWalk rw, RevCommit c) { |
| Bitmap visitedBitmap; |
| |
| if (bitmap.contains(c)) { |
| // already included |
| } else if ((visitedBitmap = bitmap.getBitmapIndex() |
| .getBitmap(c)) != null) { |
| bitmap.or(visitedBitmap); |
| } else if (cachedCommit.equals(c)) { |
| bitmap.or(cachedBitmap); |
| } else { |
| bitmap.addObject(c, Constants.OBJ_COMMIT); |
| return true; |
| } |
| |
| for (RevCommit p : c.getParents()) { |
| p.add(RevFlag.SEEN); |
| } |
| return false; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public final RevFilter clone() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public final boolean requiresCommitBody() { |
| return false; |
| } |
| } |
| |