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/*******************************************************************************
* Copyright (c) 2007, 2011 IBM Corporation and others.
* 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
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.artifact.repository;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.core.runtime.URIUtil;
import org.eclipse.equinox.internal.p2.core.helpers.ServiceHelper;
import org.eclipse.osgi.service.datalocation.Location;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
public class Activator implements BundleActivator {
public static final String ID = "org.eclipse.equinox.p2.artifact.repository"; //$NON-NLS-1$
public static final String ENABLE_ARTIFACT_LOCKING = "eclipse.p2.internal.simple.artifact.repository.locking"; //$NON-NLS-1$
public static final String REPO_PROVIDER_XPT = ID + '.' + "artifactRepositories"; //$NON-NLS-1$
private Map<URI, Location> locationCache = null;
private static BundleContext context;
private static Activator instance;
public static BundleContext getContext() {
return Activator.context;
}
public void start(BundleContext aContext) throws Exception {
Activator.context = aContext;
Activator.instance = this;
this.locationCache = new HashMap<URI, Location>();
}
public void stop(BundleContext aContext) throws Exception {
Activator.context = null;
Activator.instance = null;
this.locationCache = null;
}
public static Activator getInstance() {
return Activator.instance;
}
public boolean enableArtifactLocking() {
String property = getContext().getProperty(ENABLE_ARTIFACT_LOCKING);
if (property == null || property.length() == 0)
return false; // return false by default;
Boolean valueOf = Boolean.valueOf(property);
if (valueOf != null)
return valueOf.booleanValue();
return false;
}
/**
* Returns the lock location for a given artifact repository
* @param repositoryLocation A URI pointing to an artifact repository. Currently only
* file:// repositories are supported
* @return The Location that can be locked when using an artifact repository
* @throws IOException Thrown if a Location can not be created
*/
public synchronized Location getLockLocation(URI repositoryLocation) throws IOException {
if (locationCache.containsKey(repositoryLocation)) {
return locationCache.get(repositoryLocation);
}
Location anyLoc = (Location) ServiceHelper.getService(Activator.getContext(), Location.class.getName());
File repositoryFile = URIUtil.toFile(repositoryLocation);
Location location = anyLoc.createLocation(null, getLockFile(repositoryLocation).toURL(), isReadOnly(repositoryFile));
location.set(getLockFile(repositoryLocation).toURL(), false);
locationCache.put(repositoryLocation, location);
return location;
}
/**
* Determines if a location is read only by checking the file, and looking
* at the parent chain if necessary.
*/
private boolean isReadOnly(File file) {
if (file == null)
return true; // If we've reached the root, then return true
else if (file.canWrite())
return false; // If we can write to this area, then it's not read-only
else if (file.exists())
return true; // if we can't write && file exists, then this is a read only area
else
return isReadOnly(file.getParentFile());
}
private File getLockFile(URI repositoryLocation) throws IOException {
if (!URIUtil.isFileURI(repositoryLocation)) {
throw new IOException("Cannot lock a non file based repository"); //$NON-NLS-1$
}
URI result = URIUtil.append(repositoryLocation, ".artifactlock"); //$NON-NLS-1$
return URIUtil.toFile(result);
}
}
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