| /******************************************************************************* |
| * Copyright (c) 2000, 2006 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; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.team.core.variants.IResourceVariantComparator#compare(org.eclipse.core.resources.IResource, org.eclipse.team.core.variants.IResourceVariant) |
| */ |
| 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; |
| } |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.team.core.variants.IResourceVariantComparator#compare(org.eclipse.team.core.variants.IResourceVariant, org.eclipse.team.core.variants.IResourceVariant) |
| */ |
| public boolean compare(IResourceVariant base, IResourceVariant remote) { |
| byte[] bytes1 = getBytes(base); |
| byte[] bytes2 = getBytes(remote); |
| return equals(bytes1, bytes2); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.team.core.variants.IResourceVariantComparator#isThreeWay() |
| */ |
| 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; |
| } |
| } |