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- /*
- * Copyright (C) 2012, Google Inc.
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.internal.storage.pack;
-
- import java.io.IOException;
- import java.util.Set;
-
- import org.eclipse.jgit.errors.IncorrectObjectTypeException;
- import org.eclipse.jgit.errors.MissingObjectException;
- import org.eclipse.jgit.lib.BitmapIndex;
- 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.NullProgressMonitor;
- import org.eclipse.jgit.lib.ObjectId;
- import org.eclipse.jgit.lib.ProgressMonitor;
- import org.eclipse.jgit.revwalk.ObjectWalk;
- import org.eclipse.jgit.revwalk.RevCommit;
- import org.eclipse.jgit.revwalk.RevFlag;
- import org.eclipse.jgit.revwalk.RevObject;
- import org.eclipse.jgit.revwalk.RevWalk;
- import org.eclipse.jgit.revwalk.filter.RevFilter;
-
- /** Helper class for PackWriter to do ObjectWalks with pack index bitmaps. */
- final class PackWriterBitmapWalker {
-
- private final ObjectWalk walker;
-
- private final BitmapIndex bitmapIndex;
-
- private final ProgressMonitor pm;
-
- private long countOfBitmapIndexMisses;
-
- PackWriterBitmapWalker(
- ObjectWalk walker, BitmapIndex bitmapIndex, ProgressMonitor pm) {
- this.walker = walker;
- this.bitmapIndex = bitmapIndex;
- this.pm = (pm == null) ? NullProgressMonitor.INSTANCE : pm;
- }
-
- long getCountOfBitmapIndexMisses() {
- return countOfBitmapIndexMisses;
- }
-
- BitmapBuilder findObjects(Set<? extends ObjectId> start, BitmapBuilder seen, boolean ignoreMissingStart)
- throws MissingObjectException, IncorrectObjectTypeException,
- IOException {
- final BitmapBuilder bitmapResult = bitmapIndex.newBitmapBuilder();
-
- for (ObjectId obj : start) {
- Bitmap bitmap = bitmapIndex.getBitmap(obj);
- if (bitmap != null)
- bitmapResult.or(bitmap);
- }
-
- boolean marked = false;
- for (ObjectId obj : start) {
- try {
- if (!bitmapResult.contains(obj)) {
- walker.markStart(walker.parseAny(obj));
- marked = true;
- }
- } catch (MissingObjectException e) {
- if (ignoreMissingStart)
- continue;
- throw e;
- }
- }
-
- if (marked) {
- if (seen == null) {
- walker.setRevFilter(new AddToBitmapFilter(bitmapResult));
- } else {
- walker.setRevFilter(
- new AddUnseenToBitmapFilter(seen, bitmapResult));
- }
-
- while (walker.next() != null) {
- // Iterate through all of the commits. The BitmapRevFilter does
- // the work.
- //
- // filter.include returns true for commits that do not have
- // a bitmap in bitmapIndex and are not reachable from a
- // bitmap in bitmapIndex encountered earlier in the walk.
- // Thus the number of commits returned by next() measures how
- // much history was traversed without being able to make use
- // of bitmaps.
- pm.update(1);
- countOfBitmapIndexMisses++;
- }
-
- RevObject ro;
- while ((ro = walker.nextObject()) != null) {
- bitmapResult.addObject(ro, ro.getType());
- pm.update(1);
- }
- }
-
- return bitmapResult;
- }
-
- void reset() {
- walker.reset();
- }
-
- /**
- * 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.
- */
- static class AddToBitmapFilter extends RevFilter {
- private final BitmapBuilder bitmap;
-
- AddToBitmapFilter(BitmapBuilder bitmap) {
- this.bitmap = bitmap;
- }
-
- @Override
- public final boolean include(RevWalk walker, RevCommit cmit) {
- Bitmap visitedBitmap;
-
- if (bitmap.contains(cmit)) {
- // already 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;
- }
-
- @Override
- public final RevFilter clone() {
- throw new UnsupportedOperationException();
- }
-
- @Override
- public final boolean requiresCommitBody() {
- return false;
- }
- }
-
- /**
- * 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.
- */
- static class AddUnseenToBitmapFilter extends RevFilter {
- private final BitmapBuilder seen;
- private final BitmapBuilder bitmap;
-
- AddUnseenToBitmapFilter(BitmapBuilder seen, BitmapBuilder bitmapResult) {
- this.seen = seen;
- this.bitmap = bitmapResult;
- }
-
- @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;
- }
-
- @Override
- public final RevFilter clone() {
- throw new UnsupportedOperationException();
- }
-
- @Override
- public final boolean requiresCommitBody() {
- return false;
- }
- }
- }
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