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/*******************************************************************************
* Copyright (c) 2000, 2017 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.team.core.variants;
import org.eclipse.core.resources.IResource;
import org.eclipse.team.core.TeamException;
import org.eclipse.team.internal.core.TeamPlugin;
/**
* A resource comparator that uses the <code>ThreeWaySynchronizer</code>
* to compare local resources to their resource variants. The local state
* is determined using the local modification state and the remote state
* is determined by comparing the base bytes to the remote bytes obtained
* from the synchronizer.
*
* @since 3.0
*/
public class ThreeWayResourceComparator implements IResourceVariantComparator {
private ThreeWaySynchronizer synchronizer;
/**
* Create a three-way resource comparator that uses the <code>ThreeWaySynchronizer</code>
* to compare a local resource to a resource variant.
* @param synchronizer
*/
public ThreeWayResourceComparator(ThreeWaySynchronizer synchronizer) {
this.synchronizer = synchronizer;
}
@Override
public boolean compare(IResource local, IResourceVariant remote) {
// First, ensure the resources are the same gender
if ((local.getType() == IResource.FILE) == remote.isContainer()) {
return false;
}
try {
// If the file is locally modified, it cannot be in sync
if (local.getType() == IResource.FILE && getSynchronizer().isLocallyModified(local)) {
return false;
}
// If there is no base, the local cannot match the remote
if (getSynchronizer().getBaseBytes(local) == null) return false;
// Otherwise, assume they are the same if the remote equals the base
return equals(getSynchronizer().getBaseBytes(local), getBytes(remote));
} catch (TeamException e) {
TeamPlugin.log(e);
return false;
}
}
@Override
public boolean compare(IResourceVariant base, IResourceVariant remote) {
byte[] bytes1 = getBytes(base);
byte[] bytes2 = getBytes(remote);
return equals(bytes1, bytes2);
}
@Override
public boolean isThreeWay() {
return true;
}
private ThreeWaySynchronizer getSynchronizer() {
return synchronizer;
}
private byte[] getBytes(IResourceVariant remote) {
return remote.asBytes();
}
private boolean equals(byte[] syncBytes, byte[] oldBytes) {
if (syncBytes.length != oldBytes.length) return false;
for (int i = 0; i < oldBytes.length; i++) {
if (oldBytes[i] != syncBytes[i]) return false;
}
return true;
}
}
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