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/*******************************************************************************
* Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
* Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*******************************************************************************/
package org.eclipse.egit.core.internal.storage;
import java.io.IOException;
import java.util.Collections;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.egit.core.Activator;
import org.eclipse.egit.core.project.RepositoryMapping;
import org.eclipse.team.core.history.IFileHistoryProvider;
import org.eclipse.team.core.history.IFileRevision;
import org.eclipse.team.core.history.provider.FileHistory;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.treewalk.filter.AndTreeFilter;
import org.eclipse.jgit.treewalk.filter.PathFilterGroup;
import org.eclipse.jgit.treewalk.filter.TreeFilter;
/**
* A list of revisions for a specific resource according to some filtering
* criterion. Though git really does not do file tracking, this corresponds to
* listing all files with the same path.
*/
class GitFileHistory extends FileHistory implements IAdaptable {
private static final int SINGLE_REVISION = IFileHistoryProvider.SINGLE_REVISION;
private static final IFileRevision[] NO_REVISIONS = {};
private static final int BATCH_SIZE = 256;
private final IResource resource;
private String gitPath;
private final KidWalk walk;
private final IFileRevision[] revisions;
GitFileHistory(final IResource rsrc, final int flags,
final IProgressMonitor monitor) {
resource = rsrc;
walk = buildWalk();
revisions = buildRevisions(monitor, flags);
}
private KidWalk buildWalk() {
final RepositoryMapping rm = RepositoryMapping.getMapping(resource);
if (rm == null) {
Activator.logError("Git not attached to project "
+ resource.getProject().getName() + ".", null);
return null;
}
final KidWalk w = new KidWalk(rm.getRepository());
gitPath = rm.getRepoRelativePath(resource);
w.setTreeFilter(AndTreeFilter.create(PathFilterGroup
.createFromStrings(Collections.singleton(gitPath)),
TreeFilter.ANY_DIFF));
return w;
}
private IFileRevision[] buildRevisions(final IProgressMonitor monitor,
final int flags) {
if (walk == null)
return NO_REVISIONS;
final Repository db = walk.getRepository();
final RevCommit root;
try {
final AnyObjectId headId = db.resolve(Constants.HEAD);
if (headId == null) {
Activator.logError("No HEAD revision available from Git"
+ " for project " + resource.getProject().getName()
+ ".", null);
return NO_REVISIONS;
}
root = walk.parseCommit(headId);
if ((flags & SINGLE_REVISION) == SINGLE_REVISION) {
// If all Eclipse wants is one revision it probably is
// for the editor "quick diff" feature. We can pass off
// just the repository HEAD, even though it may not be
// the revision that most recently modified the path.
//
final CommitFileRevision single;
single = new CommitFileRevision(db, root, gitPath);
return new IFileRevision[] { single };
}
walk.markStart(root);
} catch (IOException e) {
Activator.logError("Invalid HEAD revision for project "
+ resource.getProject().getName() + ".", e);
return NO_REVISIONS;
}
final KidCommitList list = new KidCommitList();
list.source(walk);
try {
for (;;) {
final int oldsz = list.size();
list.fillTo(oldsz + BATCH_SIZE - 1);
if (oldsz == list.size())
break;
if (monitor != null && monitor.isCanceled())
break;
}
} catch (IOException e) {
Activator.logError("Error parsing history for "
+ resource.getFullPath() + ".", e);
return NO_REVISIONS;
}
final IFileRevision[] r = new IFileRevision[list.size()];
for (int i = 0; i < r.length; i++)
r[i] = new CommitFileRevision(db, list.get(i), gitPath);
return r;
}
public IFileRevision[] getContributors(final IFileRevision ifr) {
if (!(ifr instanceof CommitFileRevision))
return NO_REVISIONS;
final CommitFileRevision rev = (CommitFileRevision) ifr;
final Repository db = walk.getRepository();
final String p = rev.getGitPath();
final RevCommit c = rev.getRevCommit();
final IFileRevision[] r = new IFileRevision[c.getParentCount()];
for (int i = 0; i < r.length; i++)
r[i] = new CommitFileRevision(db, c.getParent(i), p);
return r;
}
public IFileRevision[] getTargets(final IFileRevision ifr) {
if (!(ifr instanceof CommitFileRevision))
return NO_REVISIONS;
final CommitFileRevision rev = (CommitFileRevision) ifr;
final Repository db = walk.getRepository();
final String p = rev.getGitPath();
final RevCommit rc = rev.getRevCommit();
if (!(rc instanceof KidCommit))
return NO_REVISIONS;
final KidCommit c = (KidCommit) rc;
final IFileRevision[] r = new IFileRevision[c.children.length];
for (int i = 0; i < r.length; i++)
r[i] = new CommitFileRevision(db, c.children[i], p);
return r;
}
public IFileRevision getFileRevision(final String id) {
if (id == null || id.equals("") || GitFileRevision.WORKSPACE.equals(id))
return new WorkspaceFileRevision(resource);
if (GitFileRevision.INDEX.equals(id))
return new IndexFileRevision(walk.getRepository(), gitPath);
// Only return a revision if it was matched by this filtered history
for (IFileRevision r : revisions) {
if (r.getContentIdentifier().equals(id))
return r;
}
return null;
}
public IFileRevision[] getFileRevisions() {
final IFileRevision[] r = new IFileRevision[revisions.length];
System.arraycopy(revisions, 0, r, 0, r.length);
return r;
}
public Object getAdapter(Class adapter) {
return null;
}
}
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