| /* |
| * Copyright (C) 2009, Google Inc. |
| * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.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 org.eclipse.jgit.errors.IncorrectObjectTypeException; |
| import org.eclipse.jgit.errors.MissingObjectException; |
| |
| /** |
| * Delays commits to be at least {@link PendingGenerator#OVER_SCAN} late. |
| * <p> |
| * This helps to "fix up" weird corner cases resulting from clock skew, by |
| * slowing down what we produce to the caller we get a better chance to ensure |
| * PendingGenerator reached back far enough in the graph to correctly mark |
| * commits {@link RevWalk#UNINTERESTING} if necessary. |
| * <p> |
| * This generator should appear before {@link FixUninterestingGenerator} if the |
| * lower level {@link #pending} isn't already fully buffered. |
| */ |
| final class DelayRevQueue extends Generator { |
| private static final int OVER_SCAN = PendingGenerator.OVER_SCAN; |
| |
| private final Generator pending; |
| |
| private final FIFORevQueue delay; |
| |
| private int size; |
| |
| DelayRevQueue(Generator g) { |
| super(g.firstParent); |
| pending = g; |
| delay = new FIFORevQueue(); |
| } |
| |
| @Override |
| int outputType() { |
| return pending.outputType(); |
| } |
| |
| @Override |
| RevCommit next() throws MissingObjectException, |
| IncorrectObjectTypeException, IOException { |
| while (size < OVER_SCAN) { |
| final RevCommit c = pending.next(); |
| if (c == null) |
| break; |
| delay.add(c); |
| size++; |
| } |
| |
| final RevCommit c = delay.next(); |
| if (c == null) |
| return null; |
| size--; |
| return c; |
| } |
| } |