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- /*
- * Copyright (C) 2011-2012, Robin Stocker <robin@nibor.org>
- * 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 java.util.ArrayList;
- import java.util.Collection;
- import java.util.List;
-
- import org.eclipse.jgit.errors.IncorrectObjectTypeException;
- import org.eclipse.jgit.errors.MissingObjectException;
- import org.eclipse.jgit.lib.Ref;
-
- /**
- * Utility methods for {@link org.eclipse.jgit.revwalk.RevWalk}.
- */
- public final class RevWalkUtils {
-
- private RevWalkUtils() {
- // Utility class
- }
-
- /**
- * Count the number of commits that are reachable from <code>start</code>
- * until a commit that is reachable from <code>end</code> is encountered. In
- * other words, count the number of commits that are in <code>start</code>,
- * but not in <code>end</code>.
- * <p>
- * Note that this method calls
- * {@link org.eclipse.jgit.revwalk.RevWalk#reset()} at the beginning. Also
- * note that the existing rev filter on the walk is left as-is, so be sure
- * to set the right rev filter before calling this method.
- *
- * @param walk
- * the rev walk to use
- * @param start
- * the commit to start counting from
- * @param end
- * the commit where counting should end, or null if counting
- * should be done until there are no more commits
- * @return the number of commits
- * @throws org.eclipse.jgit.errors.MissingObjectException
- * @throws org.eclipse.jgit.errors.IncorrectObjectTypeException
- * @throws java.io.IOException
- */
- public static int count(final RevWalk walk, final RevCommit start,
- final RevCommit end) throws MissingObjectException,
- IncorrectObjectTypeException, IOException {
- return find(walk, start, end).size();
- }
-
- /**
- * Find commits that are reachable from <code>start</code> until a commit
- * that is reachable from <code>end</code> is encountered. In other words,
- * Find of commits that are in <code>start</code>, but not in
- * <code>end</code>.
- * <p>
- * Note that this method calls
- * {@link org.eclipse.jgit.revwalk.RevWalk#reset()} at the beginning. Also
- * note that the existing rev filter on the walk is left as-is, so be sure
- * to set the right rev filter before calling this method.
- *
- * @param walk
- * the rev walk to use
- * @param start
- * the commit to start counting from
- * @param end
- * the commit where counting should end, or null if counting
- * should be done until there are no more commits
- * @return the commits found
- * @throws org.eclipse.jgit.errors.MissingObjectException
- * @throws org.eclipse.jgit.errors.IncorrectObjectTypeException
- * @throws java.io.IOException
- */
- public static List<RevCommit> find(final RevWalk walk,
- final RevCommit start, final RevCommit end)
- throws MissingObjectException, IncorrectObjectTypeException,
- IOException {
- walk.reset();
- walk.markStart(start);
- if (end != null)
- walk.markUninteresting(end);
-
- List<RevCommit> commits = new ArrayList<>();
- for (RevCommit c : walk)
- commits.add(c);
- return commits;
- }
-
- /**
- * Find the list of branches a given commit is reachable from when following
- * parents.
- * <p>
- * Note that this method calls
- * {@link org.eclipse.jgit.revwalk.RevWalk#reset()} at the beginning.
- * <p>
- * In order to improve performance this method assumes clock skew among
- * committers is never larger than 24 hours.
- *
- * @param commit
- * the commit we are looking at
- * @param revWalk
- * The RevWalk to be used.
- * @param refs
- * the set of branches we want to see reachability from
- * @return the list of branches a given commit is reachable from
- * @throws org.eclipse.jgit.errors.MissingObjectException
- * @throws org.eclipse.jgit.errors.IncorrectObjectTypeException
- * @throws java.io.IOException
- */
- public static List<Ref> findBranchesReachableFrom(RevCommit commit,
- RevWalk revWalk, Collection<Ref> refs)
- throws MissingObjectException, IncorrectObjectTypeException,
- IOException {
-
- // Make sure commit is from the same RevWalk
- commit = revWalk.parseCommit(commit.getId());
- revWalk.reset();
- List<Ref> result = new ArrayList<>();
-
- final int SKEW = 24*3600; // one day clock skew
-
- for (Ref ref : refs) {
- RevObject maybehead = revWalk.parseAny(ref.getObjectId());
- if (!(maybehead instanceof RevCommit))
- continue;
- RevCommit headCommit = (RevCommit) maybehead;
-
- // if commit is in the ref branch, then the tip of ref should be
- // newer than the commit we are looking for. Allow for a large
- // clock skew.
- if (headCommit.getCommitTime() + SKEW < commit.getCommitTime())
- continue;
-
- if (revWalk.isMergedInto(commit, headCommit))
- result.add(ref);
- }
- return result;
- }
-
- }
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