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/*******************************************************************************
* Copyright (c) 2010 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
* Dariusz Luksza <dariusz@luksza.org>
*******************************************************************************/
package org.eclipse.egit.core.synchronize;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.Status;
import org.eclipse.egit.core.synchronize.dto.GitSynchronizeDataSet;
import org.eclipse.egit.core.Activator;
import org.eclipse.egit.core.synchronize.GitBlobResourceVariant;
import org.eclipse.egit.core.synchronize.GitFolderResourceVariant;
import org.eclipse.egit.core.synchronize.GitResourceVariant;
import org.eclipse.team.core.TeamException;
import org.eclipse.team.core.variants.IResourceVariant;
import org.eclipse.team.core.variants.IResourceVariantComparator;
import org.eclipse.team.core.variants.ResourceVariantByteStore;
class GitResourceVariantComparator implements IResourceVariantComparator {
private final GitSynchronizeDataSet gsd;
private final ResourceVariantByteStore store;
public GitResourceVariantComparator(GitSynchronizeDataSet dataSet, ResourceVariantByteStore store) {
gsd = dataSet;
this.store = store;
}
public boolean compare(IResource local, IResourceVariant remote) {
if (!local.exists() || remote == null) {
return false;
}
if (local instanceof IFile) {
if (remote.isContainer()) {
return false;
}
InputStream stream = null;
InputStream remoteStream = null;
try {
remoteStream = remote.getStorage(
new NullProgressMonitor()).getContents();
stream = getLocal(local);
byte[] remoteBytes = new byte[8096];
byte[] bytes = new byte[8096];
int remoteRead = remoteStream.read(remoteBytes);
int read = stream.read(bytes);
if (remoteRead != read) {
return false;
}
while (Arrays.equals(bytes, remoteBytes)) {
remoteRead = remoteStream.read(remoteBytes);
read = stream.read(bytes);
if (remoteRead != read) {
// didn't read the same amount, it's uneven
return false;
} else if (read == -1) {
// both at EOF, check their contents
return Arrays.equals(bytes, remoteBytes);
}
}
} catch (IOException e) {
logException(e);
return false;
} catch (CoreException e) {
logException(e);
return false;
} finally {
closeStream(stream);
closeStream(remoteStream);
}
} else if (local instanceof IContainer) {
if (!remote.isContainer()) {
return false;
}
GitFolderResourceVariant gitVariant = (GitFolderResourceVariant) remote;
return local.getFullPath().equals(
gitVariant.getResource().getFullPath());
}
return false;
}
public boolean compare(IResourceVariant base, IResourceVariant remote) {
GitResourceVariant gitBase = (GitResourceVariant) base;
GitResourceVariant gitRemote = (GitResourceVariant) remote;
IResource resourceBase = gitBase.getResource();
IResource resourceRemote = gitRemote.getResource();
if (!resourceBase.exists() || !resourceRemote.exists()) {
return false;
}
if (base.isContainer()) {
if (remote.isContainer()) {
return resourceBase.getFullPath().equals(
resourceRemote.getFullPath());
}
return false;
} else if (remote.isContainer()) {
return false;
}
GitBlobResourceVariant baseBlob = (GitBlobResourceVariant) base;
GitBlobResourceVariant remoteBlob = (GitBlobResourceVariant) remote;
return baseBlob.getId().equals(remoteBlob.getId());
}
public boolean isThreeWay() {
return true;
}
private InputStream getLocal(IResource resource) throws CoreException {
if (gsd.getData(resource.getProject()).shouldIncludeLocal()) {
return ((IFile) resource).getContents();
} else {
try {
byte[] bytes = store.getBytes(resource);
return new ByteArrayInputStream(bytes != null ? bytes : new byte[0]);
} catch (TeamException e) {
throw new CoreException(e.getStatus());
}
}
}
private void logException(Exception e) {
IStatus error = new Status(IStatus.ERROR, Activator
.getPluginId(), e.getMessage(), e);
Activator.getDefault().getLog().log(error);
}
private void closeStream(InputStream stream) {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
logException(e);
}
}
}
}
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