/*
* 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,
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* 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.
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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.Constants;
import org.eclipse.jgit.lib.NullProgressMonitor;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.BitmapIndex.Bitmap;
import org.eclipse.jgit.lib.BitmapIndex.BitmapBuilder;
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;
PackWriterBitmapWalker(
ObjectWalk walker, BitmapIndex bitmapIndex, ProgressMonitor pm) {
this.walker = walker;
this.bitmapIndex = bitmapIndex;
this.pm = (pm == null) ? NullProgressMonitor.INSTANCE : pm;
}
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) {
walker.setRevFilter(newRevFilter(seen, bitmapResult));
while (walker.next() != null) {
// Iterate through all of the commits. The BitmapRevFilter does
// the work.
pm.update(1);
}
RevObject ro;
while ((ro = walker.nextObject()) != null) {
bitmapResult.add(ro, ro.getType());
pm.update(1);
}
}
return bitmapResult;
}
void reset() {
walker.reset();
}
static RevFilter newRevFilter(
final BitmapBuilder seen, final BitmapBuilder bitmapResult) {
if (seen != null) {
return new BitmapRevFilter() {
protected boolean load(RevCommit cmit) {
if (seen.contains(cmit))
return false;
return bitmapResult.add(cmit, Constants.OBJ_COMMIT);
}
};
}
return new BitmapRevFilter() {
@Override
protected boolean load(RevCommit cmit) {
return bitmapResult.add(cmit, Constants.OBJ_COMMIT);
}
};
}
static abstract class BitmapRevFilter extends RevFilter {
protected abstract boolean load(RevCommit cmit);
@Override
public final boolean include(RevWalk walker, RevCommit cmit) {
if (load(cmit))
return true;
for (RevCommit p : cmit.getParents())
p.add(RevFlag.SEEN);
return false;
}
@Override
public final RevFilter clone() {
return this;
}
@Override
public final boolean requiresCommitBody() {
return false;
}
}
}