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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.core.resources.IWorkspaceRunnable;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.team.core.TeamException;
/**
* A resource variant tree that caches and obtains its bytes from the remote slot
* in a three-way synchronizer. Clients must subclass to provide remote resource
* variant refresh functionality.
*
* @see ThreeWaySubscriber
*
* @since 3.0
*/
public abstract class ThreeWayRemoteTree extends ResourceVariantTree {
private ThreeWaySubscriber subscriber;
/*
* A resource variant byte store that accesses the remote bytes
* from a three-way synchronizer. Both access and modification
* are supported.
*/
static class RemoteResourceVariantByteStore extends ResourceVariantByteStore {
private ThreeWaySynchronizer synchronizer;
public RemoteResourceVariantByteStore(ThreeWaySynchronizer synchronizer) {
this.synchronizer = synchronizer;
}
@Override
public void dispose() {
// Nothing to do as contents are owned by the TargetSynchronizer
}
@Override
public byte[] getBytes(IResource resource) throws TeamException {
return getSynchronizer().getRemoteBytes(resource);
}
@Override
public boolean setBytes(IResource resource, byte[] bytes) throws TeamException {
return getSynchronizer().setRemoteBytes(resource, bytes);
}
@Override
public boolean flushBytes(IResource resource, int depth) throws TeamException {
// This method is invoked when the remote bytes are stale and should be removed
// This is handled by the ThreeWaySynchronizer so nothing needs to be done here.
return false;
}
public boolean isVariantKnown(IResource resource) throws TeamException {
return getSynchronizer().hasSyncBytes(resource);
}
@Override
public boolean deleteBytes(IResource resource) throws TeamException {
return getSynchronizer().removeRemoteBytes(resource);
}
@Override
public IResource[] members(IResource resource) throws TeamException {
return synchronizer.members(resource);
}
private ThreeWaySynchronizer getSynchronizer() {
return synchronizer;
}
}
/**
* Create a remote resource variant tree that stores and obtains
* it's bytes from the remote slot of the synchronizer of the
* given subscriber
* @param subscriber a three-way subscriber
*/
public ThreeWayRemoteTree(ThreeWaySubscriber subscriber) {
super(new RemoteResourceVariantByteStore(subscriber.getSynchronizer()));
this.subscriber = subscriber;
}
@Override
public IResource[] roots() {
return getSubscriber().roots();
}
@Override
public IResourceVariant getResourceVariant(IResource resource) throws TeamException {
return getSubscriber().getResourceVariant(resource, getByteStore().getBytes(resource));
}
/**
* Return the subscriber associated with this resource variant tree.
* @return the subscriber associated with this resource variant tree
*/
protected ThreeWaySubscriber getSubscriber() {
return subscriber;
}
@Override
protected IResource[] collectChanges(final IResource local,
final IResourceVariant remote, final int depth, IProgressMonitor monitor)
throws TeamException {
final IResource[][] resources = new IResource[][] { null };
getSubscriber().getSynchronizer().run(local, new IWorkspaceRunnable() {
@Override
public void run(IProgressMonitor monitor) throws CoreException {
resources[0] = ThreeWayRemoteTree.super.collectChanges(local, remote, depth, monitor);
}
}, monitor);
return resources[0];
}
}
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