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/*******************************************************************************
* Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
* Copyright (C) 2007, Shawn O. Pearce <spearce@spearce.org>
* Copyright (C) 2008, Google Inc.
*
* 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.project;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.SubProgressMonitor;
import org.eclipse.egit.core.CoreText;
/**
* Searches for existing Git repositories associated with a project's files.
* <p>
* This finder algorithm searches a project's contained files to see if any of
* them are located within the working directory of an existing Git repository.
* The finder searches through linked resources, as the EGit core is capable of
* dealing with linked directories spanning multiple repositories in the same
* project.
* </p>
* <p>
* The search algorithm is exhaustive, it will find all matching repositories.
* For the project itself as well as for each linked container within the
* project it scans down the local filesystem trees to locate any Git
* repositories which may be found there. It also scans up the local filesystem
* tree to locate any Git repository which may be outside of Eclipse's
* workspace-view of the world, but which contains the project or a linked
* resource within the project. In short, if there is a Git repository
* associated, it finds it.
* </p>
*/
public class RepositoryFinder {
private final IProject proj;
private final Collection<RepositoryMapping> results = new ArrayList<RepositoryMapping>();
/**
* Create a new finder to locate Git repositories for a project.
*
* @param p
* the project this new finder should locate the existing Git
* repositories of.
*/
public RepositoryFinder(final IProject p) {
proj = p;
}
/**
* Run the search algorithm.
*
* @param m
* a progress monitor to report feedback to; may be null.
* @return all found {@link RepositoryMapping} instances associated with the
* project supplied to this instance's constructor.
* @throws CoreException
* Eclipse was unable to access its workspace, and threw up on
* us. We're throwing it back at the caller.
*/
public Collection<RepositoryMapping> find(IProgressMonitor m) throws CoreException {
if (m == null) {
m = new NullProgressMonitor();
}
find(m, proj);
return results;
}
private void find(final IProgressMonitor m, final IContainer c)
throws CoreException {
final IPath loc = c.getLocation();
m.beginTask("", 101);
m.subTask(CoreText.RepositoryFinder_finding);
try {
if (loc != null) {
final File fsLoc = loc.toFile();
final File ownCfg = configFor(fsLoc);
final IResource[] children;
if (ownCfg.isFile()) {
register(c, ownCfg.getParentFile());
}
if (c.isLinked() || c instanceof IProject) {
File p = fsLoc.getParentFile();
while (p != null) {
final File pCfg = configFor(p);
if (pCfg.isFile()) {
register(c, pCfg.getParentFile());
}
p = p.getParentFile();
}
}
m.worked(1);
children = c.members();
if (children != null && children.length > 0) {
final int scale = 100 / children.length;
for (int k = 0; k < children.length; k++) {
final IResource o = children[k];
if (o instanceof IContainer
&& !o.getName().equals(".git")) {
find(new SubProgressMonitor(m, scale),
(IContainer) o);
} else {
m.worked(scale);
}
}
}
}
} finally {
m.done();
}
}
private File configFor(final File fsLoc) {
return new File(new File(fsLoc, ".git"), "config");
}
private void register(final IContainer c, final File gitdir) {
File f;
try {
f = gitdir.getCanonicalFile();
} catch (IOException ioe) {
f = gitdir.getAbsoluteFile();
}
results.add(new RepositoryMapping(c, f));
}
}
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