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/*******************************************************************************
* Copyright (C) 2007, Dave Watson <dwatson@mimvista.com>
* Copyright (C) 2008, Robin Rosenberg <robin.rosenberg@dewire.com>
* Copyright (C) 2006, 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.op;
import java.io.File;
import java.io.IOException;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRunnable;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.team.core.TeamException;
import org.eclipse.jgit.errors.CheckoutConflictException;
import org.eclipse.jgit.lib.Commit;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.GitIndex;
import org.eclipse.jgit.lib.RefLogWriter;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.Tree;
import org.eclipse.jgit.lib.WorkDirCheckout;
/**
* This class implements checkouts of a specific revision. A check
* is made that this can be done without data loss.
*/
public class BranchOperation implements IWorkspaceRunnable {
private final Repository repository;
private final String refName;
/**
* Construct a {@link BranchOperation} object.
* @param repository
* @param refName Name of git ref to checkout
*/
public BranchOperation(Repository repository, String refName) {
this.repository = repository;
this.refName = refName;
}
private Tree oldTree;
private GitIndex index;
private Tree newTree;
private Commit oldCommit;
private Commit newCommit;
public void run(IProgressMonitor monitor) throws CoreException {
lookupRefs();
monitor.worked(1);
mapObjects();
monitor.worked(1);
checkoutTree();
monitor.worked(1);
writeIndex();
monitor.worked(1);
updateHeadRef();
monitor.worked(1);
writeHeadReflog();
monitor.worked(1);
refreshProjects();
monitor.worked(1);
monitor.done();
}
private void refreshProjects() {
final IProject[] projects = ResourcesPlugin.getWorkspace().getRoot()
.getProjects();
final File parentFile = repository.getWorkDir();
for (IProject p : projects) {
final File file = p.getLocation().toFile();
if (file.getAbsolutePath().startsWith(parentFile.getAbsolutePath())) {
try {
System.out.println("Refreshing " + p);
p.refreshLocal(IResource.DEPTH_INFINITE, null);
} catch (CoreException e) {
e.printStackTrace();
}
}
}
}
private void writeHeadReflog() throws TeamException {
try {
RefLogWriter.writeReflog(repository, oldCommit.getCommitId(),
newCommit.getCommitId(), "checkout: moving to " + refName,
Constants.HEAD);
} catch (IOException e) {
throw new TeamException("Writing HEAD's reflog", e);
}
}
private void updateHeadRef() throws TeamException {
try {
repository.writeSymref(Constants.HEAD, refName);
} catch (IOException e) {
throw new TeamException("Updating HEAD to ref: " + refName, e);
}
}
private void writeIndex() throws TeamException {
try {
index.write();
} catch (IOException e) {
throw new TeamException("Writing index", e);
}
}
private void checkoutTree() throws TeamException {
try {
new WorkDirCheckout(repository, repository.getWorkDir(), oldTree,
index, newTree).checkout();
} catch (CheckoutConflictException e) {
TeamException teamException = new TeamException(e.getMessage());
throw teamException;
} catch (IOException e) {
throw new TeamException("Problem while checking out:", e);
}
}
private void mapObjects() throws TeamException {
try {
oldTree = oldCommit.getTree();
index = repository.getIndex();
newTree = newCommit.getTree();
} catch (IOException e) {
throw new TeamException("Mapping trees", e);
}
}
private void lookupRefs() throws TeamException {
try {
newCommit = repository.mapCommit(refName);
} catch (IOException e) {
throw new TeamException("Mapping commit: " + refName, e);
}
try {
oldCommit = repository.mapCommit(Constants.HEAD);
} catch (IOException e) {
throw new TeamException("Mapping commit HEAD commit", e);
}
}
}
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