| /* |
| * 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; |
| |
| abstract class AbstractRevQueue extends Generator { |
| static final AbstractRevQueue EMPTY_QUEUE = new AlwaysEmptyQueue(); |
| |
| /** Current output flags set for this generator instance. */ |
| int outputType; |
| |
| /** |
| * Add a commit to the queue. |
| * <p> |
| * This method always adds the commit, even if it is already in the queue or |
| * previously was in the queue but has already been removed. To control |
| * queue admission use {@link #add(RevCommit, RevFlag)}. |
| * |
| * @param c |
| * commit to add. |
| */ |
| public abstract void add(RevCommit c); |
| |
| /** |
| * Add a commit if it does not have a flag set yet, then set the flag. |
| * <p> |
| * This method permits the application to test if the commit has the given |
| * flag; if it does not already have the flag than the commit is added to |
| * the queue and the flag is set. This later will prevent the commit from |
| * being added twice. |
| * |
| * @param c |
| * commit to add. |
| * @param queueControl |
| * flag that controls admission to the queue. |
| */ |
| public final void add(final RevCommit c, final RevFlag queueControl) { |
| if (!c.has(queueControl)) { |
| c.add(queueControl); |
| add(c); |
| } |
| } |
| |
| /** |
| * Add a commit's parents if one does not have a flag set yet. |
| * <p> |
| * This method permits the application to test if the commit has the given |
| * flag; if it does not already have the flag than the commit is added to |
| * the queue and the flag is set. This later will prevent the commit from |
| * being added twice. |
| * |
| * @param c |
| * commit whose parents should be added. |
| * @param queueControl |
| * flag that controls admission to the queue. |
| */ |
| public final void addParents(final RevCommit c, final RevFlag queueControl) { |
| final RevCommit[] pList = c.parents; |
| if (pList == null) |
| return; |
| for (RevCommit p : pList) |
| add(p, queueControl); |
| } |
| |
| /** |
| * Remove the first commit from the queue. |
| * |
| * @return the first commit of this queue. |
| */ |
| @Override |
| public abstract RevCommit next(); |
| |
| /** Remove all entries from this queue. */ |
| public abstract void clear(); |
| |
| abstract boolean everbodyHasFlag(int f); |
| |
| abstract boolean anybodyHasFlag(int f); |
| |
| @Override |
| int outputType() { |
| return outputType; |
| } |
| |
| protected static void describe(final StringBuilder s, final RevCommit c) { |
| s.append(c.toString()); |
| s.append('\n'); |
| } |
| |
| private static class AlwaysEmptyQueue extends AbstractRevQueue { |
| @Override |
| public void add(RevCommit c) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public RevCommit next() { |
| return null; |
| } |
| |
| @Override |
| boolean anybodyHasFlag(int f) { |
| return false; |
| } |
| |
| @Override |
| boolean everbodyHasFlag(int f) { |
| return true; |
| } |
| |
| @Override |
| public void clear() { |
| // Nothing to clear, we have no state. |
| } |
| |
| } |
| } |