123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156 |
- /*
- * 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.
- */
- 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.
- }
-
- }
- }
|