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/*******************************************************************************
* Copyright (c) 2015 Obeo.
* 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:
* Obeo - initial API and implementation
*******************************************************************************/
package org.eclipse.emf.compare.ide.ui.internal.logical.resolver;
import static com.google.common.base.Preconditions.checkNotNull;
import static org.eclipse.emf.compare.ide.utils.ResourceUtil.asURI;
import com.google.common.collect.Sets;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.concurrent.Callable;
import org.apache.log4j.Logger;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IStorage;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.SubMonitor;
import org.eclipse.emf.common.util.Diagnostic;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.compare.ide.utils.ResourceUtil;
import org.eclipse.emf.ecore.resource.URIConverter;
/**
* Abstract super-class of resolving computations.
*
* @author <a href="mailto:laurent.delaigue@obeo.fr">Laurent Delaigue</a>
*/
public abstract class AbstractResolution {
/** The context. */
protected final IResolutionContext context;
/** The monitor. */
protected final SubMonitor monitor;
/** The diagnostic. */
protected DiagnosticSupport diagnostic;
/** The logger */
protected final Logger logger = Logger.getLogger(getClass());
/**
* Constructor.
*
* @param context
* The resolution context, must not be {@code null}
* @param monitor
* The progress monitor, can be {@code null}
*/
public AbstractResolution(IResolutionContext context, IProgressMonitor monitor) {
this.context = checkNotNull(context);
this.monitor = SubMonitor.convert(monitor, getTicks());
}
/**
* Number of ticks to allocate to the progress monitor used for reporting progress.
*
* @return The number of ticks to use, 100 by default but can be overridden if necessary.
*/
protected int getTicks() {
return 100;
}
/**
* Executes the given callable as soon as there is no other computation running, and automatically runs
* "finalization" treatment once the computation is over, whatever its outcome (success or failure). A
* {@link #diagnostic} is instantiated before the computation and should be used thourghout this whole
* computation. It will be set to {@code null} before returning, whatever happens.
*
* @param <T>
* The type of the returned value.
* @param callable
* Treatment to run
* @return The result of the treatment
*/
protected <T> T call(Callable<T> callable) {
this.diagnostic = new DiagnosticSupport();
return context.getScheduler().call(callable, getFinalizeResolvingRunnable());
}
/**
* This provides the treatment that is run at the end of the computation, whatever its outcome. It is
* guaranteed to run once, in a block "finally", along with other required finalization treatments that
* are run systematically. There's no need to acquire a lock, this is guaranteed to have been done before,
* and it is released after this treatment ends.
*
* @return The {@link Runnable} to run after having resolved resources.
*/
protected Runnable getFinalizeResolvingRunnable() {
return new Runnable() {
public void run() {
if (diagnostic.getDiagnostic().getSeverity() >= Diagnostic.ERROR) {
// something bad (or a cancel request) happened during resolution, so we invalidate the
// dependency graph to avoid weird behavior next time the resolution is called.
// TODO Should we really do that?
// FIXME dependencyGraph.clear();
}
diagnostic = null;
}
};
}
/**
* Transforms the given {@link Set} of {@link IStorage}s into a {@link Set} of {@link URI}s.
*
* @param storages
* The storages to transform, must not be {@code null}.
* @return A mutable set of {@link URI}s, may be empty but never {@code )null}.
*/
protected Set<URI> asURISet(Set<IStorage> storages) {
final Set<URI> uris = new LinkedHashSet<URI>();
for (IStorage storage : storages) {
uris.add(asURI().apply(storage));
}
return uris;
}
/**
* Computes the traversal of the given file, excluding the given bounds if needed.
*
* @param file
* File for which the traversal is needed
* @param bounds
* URI to exclude from the logical model computation in case both compared resources are part
* of the same logical model
* @return A {@link Set} of the file's outgoing and incoming dependencies, never null but possibly empty.
*/
protected Set<IStorage> resolveTraversal(IFile file, Set<URI> bounds) {
final Set<IStorage> traversalSet = Sets.newLinkedHashSet();
Set<IFile> filesToAdd = Sets.newLinkedHashSet();
filesToAdd.add(file);
Set<URI> knownURIs = Sets.newLinkedHashSet();
while (!filesToAdd.isEmpty()) {
Set<IFile> filesToResolve = Sets.newLinkedHashSet();
for (IFile newFile : filesToAdd) {
URI baseUri = ResourceUtil.createURIFor(newFile);
Set<URI> newURIs = context.getImplicitDependencies().of(baseUri, URIConverter.INSTANCE);
for (URI uri : newURIs) {
if (knownURIs.add(uri)) {
IFile toResolve = ResolutionUtil.getFileAt(uri);
Iterable<URI> dependencies = context.getDependencyProvider().getDependenciesOf(
toResolve, bounds);
for (URI dep : dependencies) {
IFile dependentFile = ResolutionUtil.getFileAt(dep);
if (dependentFile != null && traversalSet.add(dependentFile)
&& !knownURIs.contains(dep)) {
filesToResolve.add(dependentFile);
}
}
}
}
}
filesToAdd.clear();
filesToAdd = filesToResolve;
}
return traversalSet;
}
}
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