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/*******************************************************************************
* Copyright (c) 2015 Obeo 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:
* Obeo - initial API and implementation
* Philip Langer - refactorings
*******************************************************************************/
package org.eclipse.emf.compare.ide.ui.internal.logical.resolver;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.eventbus.EventBus;
import com.google.common.eventbus.Subscribe;
import java.util.Collections;
import org.apache.log4j.Logger;
import org.eclipse.emf.compare.graph.IGraph;
/**
* This class's responsibility is to maintain the state of its graph when notified that a new model resource
* or a new dependency have been found.
*
* @author <a href="mailto:laurent.delaigue@obeo.fr">Laurent Delaigue</a>
*/
public class DependencyGraphUpdater<T> {
/** The graph of dependencies between the resources. */
private final IGraph<T> dependencyGraph;
/** The logger. */
private static final Logger LOGGER = Logger.getLogger(DependencyGraphUpdater.class);
/**
* Constructor.
*
* @param graph
* The graph, must not be null.
* @param eventBus
* The event bus that will fire events to record.
*/
public DependencyGraphUpdater(IGraph<T> graph, EventBus eventBus) {
this.dependencyGraph = checkNotNull(graph);
eventBus.register(this);
}
/**
* Register a discovered resource in the graph.
*
* @param event
* Event that describes the discovered resource.
*/
@Subscribe
public synchronized void recordNode(ResolvedEvent<T> event) {
dependencyGraph.add(event.getNode());
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Added node " + event.getNode()); //$NON-NLS-1$
}
}
/**
* Register a dependency in the graph.
*
* @param event
* Event that describes the dependency.
*/
@Subscribe
public synchronized void recordEdge(DependencyFoundEvent<T> event) {
dependencyGraph.addChildren(event.getFrom(), Collections.singleton(event.getTo()));
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Added edge " + event.getFrom() + " -> " + event.getTo()); //$NON-NLS-1$ //$NON-NLS-2$
}
if (event.hasParent()) {
dependencyGraph.addParentData(event.getTo(), event.getParent().get());
}
}
/**
* Register removal of nodes.
*
* @param event
* The event indicating the removed nodes.
*/
@Subscribe
public synchronized void recordRemoval(ResourceRemovedEvent<T> event) {
dependencyGraph.removeAll(event.getElements());
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Cleared " + event.getElements().size() + " nodes."); //$NON-NLS-1$ //$NON-NLS-2$
}
}
}
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