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/*
* Copyright (C) 2008-2018, Robin Rosenberg <robin.rosenberg@dewire.com>
* Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org> and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
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.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.internal.JGitText;
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>> additionalRefMap;
private Map<AnyObjectId, Set<Ref>> reverseRefMap;
private Repository repository;
@Override
public void dispose() {
super.dispose();
if (reverseRefMap != null) {
reverseRefMap.clear();
reverseRefMap = null;
}
if (additionalRefMap != null) {
additionalRefMap.clear();
additionalRefMap = null;
}
repository = null;
}
/**
* Create a new revision walker for a given repository.
*
* @param repo
* the repository the walker will obtain data from.
*/
public PlotWalk(Repository repo) {
super(repo);
super.sort(RevSort.TOPO, true);
additionalRefMap = new HashMap<>();
repository = repo;
}
/**
* Add additional refs to the walk
*
* @param refs
* additional refs
* @throws java.io.IOException
* if an IO error occurred
*/
public void addAdditionalRefs(Iterable<Ref> refs) throws IOException {
for (Ref ref : refs) {
Set<Ref> set = additionalRefMap.get(ref.getObjectId());
if (set == null)
set = Collections.singleton(ref);
else {
set = new HashSet<>(set);
set.add(ref);
}
additionalRefMap.put(ref.getObjectId(), set);
}
}
@Override
public void sort(RevSort s, boolean use) {
if (s == RevSort.TOPO && !use)
throw new IllegalArgumentException(JGitText.get().topologicalSortRequired);
super.sort(s, use);
}
@Override
protected RevCommit createCommit(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(AnyObjectId commitId) throws IOException {
if (reverseRefMap == null) {
reverseRefMap = repository.getAllRefsByPeeledObjectId();
for (Map.Entry<AnyObjectId, Set<Ref>> entry : additionalRefMap
.entrySet()) {
Set<Ref> set = reverseRefMap.get(entry.getKey());
Set<Ref> additional = entry.getValue();
if (set != null) {
if (additional.size() == 1) {
// It's an unmodifiable singleton set...
additional = new HashSet<>(additional);
}
additional.addAll(set);
}
reverseRefMap.put(entry.getKey(), additional);
}
additionalRefMap.clear();
additionalRefMap = null;
}
Collection<Ref> list = reverseRefMap.get(commitId);
if (list == null) {
return PlotCommit.NO_REFS;
}
Ref[] tags = list.toArray(new Ref[0]);
Arrays.sort(tags, new PlotRefComparator());
return tags;
}
class PlotRefComparator implements Comparator<Ref> {
@Override
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;
try {
parseBody(tag);
} catch (IOException e) {
return 0;
}
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;
}
}
}
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