/*
* Copyright (C) 2008-2009, Robin Rosenberg <robin.rosenberg@dewire.com>
* 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.revplot;
import static org.eclipse.jgit.lib.Constants.R_HEADS;
import static org.eclipse.jgit.lib.Constants.R_REMOTES;
import static org.eclipse.jgit.lib.Constants.R_TAGS;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.eclipse.jgit.JGitText;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevObject;
import org.eclipse.jgit.revwalk.RevSort;
import org.eclipse.jgit.revwalk.RevTag;
import org.eclipse.jgit.revwalk.RevWalk;
/** Specialized RevWalk for visualization of a commit graph. */
public class PlotWalk extends RevWalk {
private Map<AnyObjectId, Set<Ref>> reverseRefMap;
@Override
public void dispose() {
super.dispose();
reverseRefMap.clear();
}
/**
* Create a new revision walker for a given repository.
*
* @param repo
* the repository the walker will obtain data from.
*/
public PlotWalk(final Repository repo) {
super(repo);
super.sort(RevSort.TOPO, true);
reverseRefMap = repo.getAllRefsByPeeledObjectId();
}
/**
* Add additional refs to the walk
*
* @param refs
* additional refs
*
* @throws IOException
*/
public void addAdditionalRefs(Iterable<Ref> refs) throws IOException {
for (Ref ref : refs) {
Set<Ref> set = reverseRefMap.get(ref.getObjectId());
if (set == null)
set = Collections.singleton(ref);
else {
set = new HashSet<Ref>(set);
set.add(ref);
}
reverseRefMap.put(ref.getObjectId(), set);
}
}
@Override
public void sort(final RevSort s, final boolean use) {
if (s == RevSort.TOPO && !use)
throw new IllegalArgumentException(JGitText.get().topologicalSortRequired);
super.sort(s, use);
}
@Override
protected RevCommit createCommit(final AnyObjectId id) {
return new PlotCommit(id);
}
@Override
public RevCommit next() throws MissingObjectException,
IncorrectObjectTypeException, IOException {
PlotCommit<?> pc = (PlotCommit) super.next();
if (pc != null)
pc.refs = getRefs(pc);
return pc;
}
private Ref[] getRefs(final AnyObjectId commitId) {
Collection<Ref> list = reverseRefMap.get(commitId);
if (list == null)
return PlotCommit.NO_REFS;
else {
Ref[] tags = list.toArray(new Ref[list.size()]);
Arrays.sort(tags, new PlotRefComparator());
return tags;
}
}
class PlotRefComparator implements Comparator<Ref> {
public int compare(Ref o1, Ref o2) {
try {
RevObject obj1 = parseAny(o1.getObjectId());
RevObject obj2 = parseAny(o2.getObjectId());
long t1 = timeof(obj1);
long t2 = timeof(obj2);
if (t1 > t2)
return -1;
if (t1 < t2)
return 1;
} catch (IOException e) {
// ignore
}
int cmp = kind(o1) - kind(o2);
if (cmp == 0)
cmp = o1.getName().compareTo(o2.getName());
return cmp;
}
long timeof(RevObject o) {
if (o instanceof RevCommit)
return ((RevCommit) o).getCommitTime();
if (o instanceof RevTag) {
RevTag tag = (RevTag) o;
PersonIdent who = tag.getTaggerIdent();
return who != null ? who.getWhen().getTime() : 0;
}
return 0;
}
int kind(Ref r) {
if (r.getName().startsWith(R_TAGS))
return 0;
if (r.getName().startsWith(R_HEADS))
return 1;
if (r.getName().startsWith(R_REMOTES))
return 2;
return 3;
}
}
}