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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;
- import org.eclipse.jgit.lib.ObjectId;
-
- /**
- * 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 int deepenSince;
-
- 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;
-
- /**
- * Commits reachable from commits that the client specified using --shallow-exclude.
- */
- private final RevFlag DEEPEN_NOT;
-
- /**
- * @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.deepenSince = w.getDeepenSince();
- this.UNSHALLOW = w.getUnshallowFlag();
- this.REINTERESTING = w.getReinterestingFlag();
- this.DEEPEN_NOT = w.getDeepenNotFlag();
-
- s.shareFreeList(pending);
-
- // Begin by sucking out all of the source's commits, and
- // adding them to the pending queue
- FIFORevQueue unshallowCommits = new FIFORevQueue();
- for (;;) {
- RevCommit c = s.next();
- if (c == null)
- break;
- if (c.has(UNSHALLOW)) {
- unshallowCommits.add(c);
- } else if (((DepthWalk.Commit) c).getDepth() == 0) {
- pending.add(c);
- }
- }
- // Move unshallow commits to the front so that the REINTERESTING flag
- // carry over code is executed first.
- for (;;) {
- RevCommit c = unshallowCommits.next();
- if (c == null) {
- break;
- }
- pending.unpop(c);
- }
-
- // Mark DEEPEN_NOT on all deepen-not commits and their ancestors.
- // TODO(jonathantanmy): This implementation is somewhat
- // inefficient in that any "deepen-not <ref>" in the request
- // results in all commits reachable from that ref being parsed
- // and marked, even if the commit topology is such that it is
- // not necessary.
- for (ObjectId oid : w.getDeepenNots()) {
- RevCommit c;
- try {
- c = walk.parseCommit(oid);
- } catch (IncorrectObjectTypeException notCommit) {
- // The C Git implementation silently tolerates
- // non-commits, so do the same here.
- continue;
- }
-
- FIFORevQueue queue = new FIFORevQueue();
- queue.add(c);
- while ((c = queue.next()) != null) {
- if (c.has(DEEPEN_NOT)) {
- continue;
- }
-
- walk.parseHeaders(c);
- c.add(DEEPEN_NOT);
- for (RevCommit p : c.getParents()) {
- queue.add(p);
- }
- }
- }
- }
-
- @Override
- int outputType() {
- return pending.outputType() | HAS_UNINTERESTING;
- }
-
- @Override
- void shareFreeList(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);
-
- if (c.getCommitTime() < deepenSince) {
- continue;
- }
-
- if (c.has(DEEPEN_NOT)) {
- continue;
- }
-
- int newDepth = c.depth + 1;
-
- for (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) {
- boolean failsDeepenSince = false;
- if (deepenSince != 0) {
- if ((p.flags & RevWalk.PARSED) == 0) {
- p.parseHeaders(walk);
- }
- failsDeepenSince =
- p.getCommitTime() < deepenSince;
- }
-
- dp.depth = newDepth;
-
- // If the parent is not too deep and was not excluded, add
- // it to the queue so that we can produce it later
- if (newDepth <= depth && !failsDeepenSince &&
- !p.has(DEEPEN_NOT)) {
- pending.add(p);
- } else {
- dp.makesChildBoundary = true;
- }
- }
-
- if (dp.makesChildBoundary) {
- c.isBoundary = true;
- }
-
- // 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;
- }
- }
-
- boolean produce = true;
-
- // 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 (c.getCommitTime() < deepenSince) {
- produce = false;
- }
-
- if (produce)
- return c;
- }
- }
- }
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