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/*******************************************************************************
* Copyright (C) 2010, Jens Baumgart <jens.baumgart@sap.com>
* Copyright (C) 2008, Robin Rosenberg <robin.rosenberg@dewire.com>
* Copyright (C) 2008, 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;
import java.io.File;
import java.io.IOException;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.internal.storage.file.FileRepository;
/**
* Central cache for Repository instances
*
*/
public class RepositoryCache {
private final Map<File, Reference<Repository>> repositoryCache = new HashMap<File, Reference<Repository>>();
RepositoryCache() {
// package private constructor
}
/**
*
* @param gitDir
* @return an existing instance of Repository for <code>gitDir</code> or a
* new one if no Repository instance for <code>gitDir</code> exists
* in the cache.
* @throws IOException
*/
public synchronized Repository lookupRepository(final File gitDir)
throws IOException {
prune(repositoryCache);
Reference<Repository> r = repositoryCache.get(gitDir);
Repository d = r != null ? r.get() : null;
if (d == null) {
d = new FileRepository(gitDir);
repositoryCache.put(gitDir, new WeakReference<Repository>(d));
}
return d;
}
/**
* @return all Repository instances contained in the cache
*/
public synchronized Repository[] getAllRepositories() {
prune(repositoryCache);
List<Repository> repositories = new ArrayList<Repository>();
for (Reference<Repository> reference : repositoryCache.values()) {
repositories.add(reference.get());
}
return repositories.toArray(new Repository[repositories.size()]);
}
private static void prune(Map<File, Reference<Repository>> map) {
for (final Iterator<Map.Entry<File, Reference<Repository>>> i = map.entrySet()
.iterator(); i.hasNext();) {
Repository repository = i.next().getValue().get();
if (repository == null
|| !repository.getDirectory().exists())
i.remove();
}
}
/**
* TESTING ONLY!
* Unit tests can use this method to get a clean beginning state
*/
public void clear() {
repositoryCache.clear();
}
}
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