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- /*
- * 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(final Generator g) {
- 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;
- }
- }
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