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/*******************************************************************************
* Copyright (C) 2008, 2009 Robin Rosenberg <robin.rosenberg@dewire.com>
*
* 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.ui.internal.decorators;
import java.io.IOException;
import java.util.Map;
import java.util.WeakHashMap;
import org.eclipse.core.resources.IEncodedStorage;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.egit.core.GitProvider;
import org.eclipse.egit.core.project.RepositoryMapping;
import org.eclipse.egit.ui.Activator;
import org.eclipse.jface.text.Document;
import org.eclipse.team.core.RepositoryProvider;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.Commit;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.IndexChangedEvent;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectLoader;
import org.eclipse.jgit.lib.RefsChangedEvent;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.RepositoryListener;
import org.eclipse.jgit.lib.Tree;
import org.eclipse.jgit.lib.TreeEntry;
class GitDocument extends Document implements RepositoryListener {
private final IResource resource;
private ObjectId lastCommit;
private ObjectId lastTree;
private ObjectId lastBlob;
static Map<GitDocument,Repository> doc2repo = new WeakHashMap<GitDocument, Repository>();
static GitDocument create(final IResource resource) throws IOException {
Activator.trace("(GitDocument) create: " + resource); //$NON-NLS-1$
GitDocument ret = null;
if (RepositoryProvider.getProvider(resource.getProject()) instanceof GitProvider) {
ret = new GitDocument(resource);
ret.populate();
final Repository repository = ret.getRepository();
if (repository != null)
repository.addRepositoryChangedListener(ret);
}
return ret;
}
private GitDocument(IResource resource) {
this.resource = resource;
GitDocument.doc2repo.put(this, getRepository());
}
private void setResolved(final AnyObjectId commit, final AnyObjectId tree, final AnyObjectId blob, final String value) {
lastCommit = commit != null ? commit.copy() : null;
lastTree = tree != null ? tree.copy() : null;
lastBlob = blob != null ? blob.copy() : null;
set(value);
if (blob != null)
Activator.trace("(GitDocument) resolved " + resource + " to " + lastBlob + " in " + lastCommit + "/" + lastTree); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
else
Activator.trace("(GitDocument) unresolved " + resource); //$NON-NLS-1$
}
void populate() throws IOException {
Activator.trace("(GitDocument) populate: " + resource); //$NON-NLS-1$
RepositoryMapping mapping = RepositoryMapping.getMapping(resource);
if (mapping == null) {
setResolved(null, null, null, ""); //$NON-NLS-1$
return;
}
final String gitPath = mapping.getRepoRelativePath(resource);
final Repository repository = mapping.getRepository();
String baseline = GitQuickDiffProvider.baseline.get(repository);
if (baseline == null)
baseline = Constants.HEAD;
ObjectId commitId = repository.resolve(baseline);
if (commitId != null) {
if (commitId.equals(lastCommit)) {
Activator.trace("(GitDocument) already resolved"); //$NON-NLS-1$
return;
}
} else {
Activator.logError("Could not resolve quickdiff baseline "
+ baseline + " corresponding to " + resource + " in "
+ repository, new Throwable());
setResolved(null, null, null, ""); //$NON-NLS-1$
return;
}
Commit baselineCommit = repository.mapCommit(commitId);
if (baselineCommit == null) {
Activator.logError("Could not load commit " + commitId + " for "
+ baseline + " corresponding to " + resource + " in "
+ repository, new Throwable());
setResolved(null, null, null, ""); //$NON-NLS-1$
return;
}
ObjectId treeId = baselineCommit.getTreeId();
if (treeId.equals(lastTree)) {
Activator.trace("(GitDocument) already resolved"); //$NON-NLS-1$
return;
}
Tree baselineTree = baselineCommit.getTree();
if (baselineTree == null) {
Activator.logError("Could not load tree " + treeId + " for "
+ baseline + " corresponding to " + resource + " in "
+ repository, new Throwable());
setResolved(null, null, null, ""); //$NON-NLS-1$
return;
}
TreeEntry blobEntry = baselineTree.findBlobMember(gitPath);
if (blobEntry != null && !blobEntry.getId().equals(lastBlob)) {
Activator.trace("(GitDocument) compareTo: " + baseline); //$NON-NLS-1$
ObjectLoader loader = repository.openBlob(blobEntry.getId());
byte[] bytes = loader.getBytes();
String charset;
// Get the encoding for the current version. As a matter of
// principle one might want to use the eclipse settings for the
// version we are retrieving as that may be defined by the
// project settings, but there is no historic API for this.
IEncodedStorage encodedStorage = ((IEncodedStorage)resource);
try {
if (encodedStorage != null)
charset = encodedStorage.getCharset();
else
charset = resource.getParent().getDefaultCharset();
} catch (CoreException e) {
charset = Constants.CHARACTER_ENCODING;
}
// Finally we could consider validating the content with respect
// to the content. We don't do that here.
String s = new String(bytes, charset);
setResolved(commitId, baselineTree.getId(), blobEntry.getId(), s);
Activator.trace("(GitDocument) has reference doc, size=" + s.length() + " bytes"); //$NON-NLS-1$ //$NON-NLS-2$
} else {
if (blobEntry == null)
setResolved(null, null, null, ""); //$NON-NLS-1$
else
Activator.trace("(GitDocument) already resolved"); //$NON-NLS-1$
}
}
void dispose() {
Activator.trace("(GitDocument) dispose: " + resource); //$NON-NLS-1$
doc2repo.remove(this);
Repository repository = getRepository();
if (repository != null)
repository.removeRepositoryChangedListener(this);
}
public void refsChanged(final RefsChangedEvent e) {
try {
populate();
} catch (IOException e1) {
Activator.logError("Failed to refresh quickdiff", e1);
}
}
public void indexChanged(final IndexChangedEvent e) {
// Index not relevant at this moment
}
private Repository getRepository() {
RepositoryMapping mapping = RepositoryMapping.getMapping(resource);
return (mapping != null) ? mapping.getRepository() : null;
}
/**
* A change occurred to a repository. Update any GitDocument instances
* referring to such repositories.
*
* @param repository Repository which changed
* @throws IOException
*/
static void refreshRelevant(final Repository repository) throws IOException {
for (Map.Entry<GitDocument, Repository> i : doc2repo.entrySet()) {
if (i.getValue() == repository) {
i.getKey().populate();
}
}
}
}
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