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/*
* Copyright (C) 2010, Garmin International
* Copyright (C) 2010, Matt Fischer <matt.fischer@garmin.com>
* 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.revwalk;
import java.io.IOException;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
/**
* Only produce commits which are below a specified depth.
*
* @see DepthWalk
*/
class DepthGenerator extends Generator {
private final FIFORevQueue pending;
private final int depth;
private final RevWalk walk;
/**
* Commits which used to be shallow in the client, but which are
* being extended as part of this fetch. These commits should be
* returned to the caller as UNINTERESTING so that their blobs/trees
* can be marked appropriately in the pack writer.
*/
private final RevFlag UNSHALLOW;
/**
* Commits which the normal framework has marked as UNINTERESTING,
* but which we now care about again. This happens if a client is
* extending a shallow checkout to become deeper--the new commits at
* the bottom of the graph need to be sent, even though they are
* below other commits which the client already has.
*/
private final RevFlag REINTERESTING;
/**
* @param w
* @param s Parent generator
* @throws MissingObjectException
* @throws IncorrectObjectTypeException
* @throws IOException
*/
DepthGenerator(DepthWalk w, Generator s) throws MissingObjectException,
IncorrectObjectTypeException, IOException {
pending = new FIFORevQueue();
walk = (RevWalk)w;
this.depth = w.getDepth();
this.UNSHALLOW = w.getUnshallowFlag();
this.REINTERESTING = w.getReinterestingFlag();
s.shareFreeList(pending);
// Begin by sucking out all of the source's commits, and
// adding them to the pending queue
for (;;) {
RevCommit c = s.next();
if (c == null)
break;
if (((DepthWalk.Commit) c).getDepth() == 0)
pending.add(c);
}
}
@Override
int outputType() {
return pending.outputType() | HAS_UNINTERESTING;
}
@Override
void shareFreeList(final BlockRevQueue q) {
pending.shareFreeList(q);
}
@Override
RevCommit next() throws MissingObjectException,
IncorrectObjectTypeException, IOException {
// Perform a breadth-first descent into the commit graph,
// marking depths as we go. This means that if a commit is
// reachable by more than one route, we are guaranteed to
// arrive by the shortest route first.
for (;;) {
final DepthWalk.Commit c = (DepthWalk.Commit) pending.next();
if (c == null)
return null;
if ((c.flags & RevWalk.PARSED) == 0)
c.parseHeaders(walk);
int newDepth = c.depth + 1;
for (final RevCommit p : c.parents) {
DepthWalk.Commit dp = (DepthWalk.Commit) p;
// If no depth has been assigned to this commit, assign
// it now. Since we arrive by the shortest route first,
// this depth is guaranteed to be the smallest value that
// any path could produce.
if (dp.depth == -1) {
dp.depth = newDepth;
// If the parent is not too deep, add it to the queue
// so that we can produce it later
if (newDepth <= depth)
pending.add(p);
}
// If the current commit has become unshallowed, everything
// below us is new to the client. Mark its parent as
// re-interesting, and carry that flag downward to all
// of its ancestors.
if(c.has(UNSHALLOW) || c.has(REINTERESTING)) {
p.add(REINTERESTING);
p.flags &= ~RevWalk.UNINTERESTING;
}
}
// Produce all commits less than the depth cutoff
boolean produce = c.depth <= depth;
// Unshallow commits are uninteresting, but still need to be sent
// up to the PackWriter so that it will exclude objects correctly.
// All other uninteresting commits should be omitted.
if ((c.flags & RevWalk.UNINTERESTING) != 0 && !c.has(UNSHALLOW))
produce = false;
if (produce)
return c;
}
}
}
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