| /* |
| * Copyright (C) 2019, Google LLC. |
| * 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.Collection; |
| import java.util.Optional; |
| |
| import org.eclipse.jgit.errors.IncorrectObjectTypeException; |
| import org.eclipse.jgit.errors.MissingObjectException; |
| |
| /** |
| * Checks the reachability walking the graph from the starters towards the |
| * target. |
| */ |
| class PedestrianReachabilityChecker implements ReachabilityChecker { |
| |
| private final boolean topoSort; |
| |
| private final RevWalk walk; |
| |
| /** |
| * New instance of the reachability checker using a existing walk. |
| * |
| * @param topoSort |
| * walk commits in topological order |
| * @param walk |
| * RevWalk instance to reuse. Caller retains ownership. |
| */ |
| public PedestrianReachabilityChecker(boolean topoSort, |
| RevWalk walk) { |
| this.topoSort = topoSort; |
| this.walk = walk; |
| } |
| |
| @Override |
| public Optional<RevCommit> areAllReachable(Collection<RevCommit> targets, |
| Collection<RevCommit> starters) |
| throws MissingObjectException, IncorrectObjectTypeException, |
| IOException { |
| walk.reset(); |
| if (topoSort) { |
| walk.sort(RevSort.TOPO); |
| } |
| |
| for (RevCommit target: targets) { |
| walk.markStart(target); |
| } |
| |
| for (RevCommit starter : starters) { |
| walk.markUninteresting(starter); |
| } |
| |
| return Optional.ofNullable(walk.next()); |
| } |
| } |