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/*******************************************************************************
* Copyright (c) 2007 compeople AG 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:
* compeople AG (Stefan Liebig) - initial API and implementation
* IBM Corporation - ongoing development
*******************************************************************************/
package org.eclipse.equinox.internal.p2.artifact.optimizers.jbdiff;
import ie.wombat.jbdiff.JBDiff;
import java.io.*;
import org.eclipse.equinox.internal.p2.artifact.optimizers.AbstractDeltaStep;
import org.eclipse.equinox.internal.p2.core.helpers.FileUtils;
import org.eclipse.equinox.internal.p2.sar.DirectByteArrayOutputStream;
import org.eclipse.equinox.internal.provisional.p2.artifact.repository.ArtifactDescriptor;
import org.eclipse.equinox.internal.provisional.p2.artifact.repository.IArtifactRepository;
/**
*
*/
public class JBDiffStep extends AbstractDeltaStep {
public JBDiffStep() {
super();
}
// TODO We need a different way of injecting the base artifacts. This approach forces
// the target and base to live in the same repo. Typical but not really required.
protected JBDiffStep(IArtifactRepository repository) {
super(repository);
}
protected OutputStream createIncomingStream() throws IOException {
return new DirectByteArrayOutputStream();
}
protected void performProcessing() throws IOException {
DirectByteArrayOutputStream predecessor = fetchPredecessorBytes(new ArtifactDescriptor(key));
DirectByteArrayOutputStream current = (DirectByteArrayOutputStream) incomingStream;
byte[] diff = JBDiff.bsdiff(predecessor.getBuffer(), predecessor.getBufferLength(), current.getBuffer(), current.getBufferLength());
// free up the memory as soon as possible.
predecessor = null;
current = null;
incomingStream = null;
// copy the result of the optimization to the destination.
FileUtils.copyStream(new ByteArrayInputStream(diff), true, destination, false);
}
private DirectByteArrayOutputStream fetchPredecessorBytes(ArtifactDescriptor artifactDescriptor) throws IOException {
DirectByteArrayOutputStream result = new DirectByteArrayOutputStream();
status = repository.getArtifact(artifactDescriptor, result, monitor);
if (!status.isOK())
throw (IOException) new IOException(status.getMessage()).initCause(status.getException());
return result;
}
}
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