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/*******************************************************************************
* Copyright (c) 2010 THALES GLOBAL SERVICES.
* 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.sirius.ecore.extender.tool.internal;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.impl.ResourceImpl;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterators;
import com.google.common.collect.Lists;
import org.eclipse.sirius.ecore.extender.business.api.permission.IPermissionAuthority;
import org.eclipse.sirius.ecore.extender.business.api.permission.PermissionAuthorityRegistry;
/**
* Class responsible for resolving some references.
*
* @author cbrun
*
*/
public class ReferencesResolver {
private Predicate<EReference> filter;
private ResourceSet set;
/**
* Create a new references resolver.
*
* @param filter
* filter telling which references to resolve.
* @param set
* resource set to resolve.
*/
public ReferencesResolver(ResourceSet set, Predicate<EReference> filter) {
this.filter = filter;
this.set = set;
}
/**
* Resolve the references.
*
* @param monitor
* monitor to track progress.
*/
public void resolve(IProgressMonitor monitor) {
final IPermissionAuthority authority = PermissionAuthorityRegistry.getDefault().getPermissionAuthority(set);
final List<Resource> cachedIdsResources = ReferencesResolver.prepareResolveAll(set, authority);
monitor.beginTask("Resolving non contained references", set.getResources().size());
for (Resource res : Lists.newArrayList(set.getResources())) {
doResolveAll(res);
monitor.worked(1);
}
monitor.done();
ReferencesResolver.unprepareResolveAll(authority, cachedIdsResources);
}
/**
* Visits all proxies in the resource and tries to resolve them.
*
* @param resource
* the objects to visit.
* @param filter
* the filter telling which references to resolve.
*/
private void doResolveAll(Resource resource) {
Iterator<EObject> i = resource.getAllContents();
while (i.hasNext()) {
EObject eObject = i.next();
resolveCrossReferences(eObject);
}
}
private void resolveCrossReferences(EObject eObject) {
Iterator<EReference> it = Iterators.filter(eObject.eClass().getEAllReferences().iterator(), filter);
while (it.hasNext()) {
eObject.eGet(it.next());
}
}
/**
* Prepare the whole resolving by setting accelerating ID resolving maps.
*
* @param set
* the resource set to resolve.
* @param authority
* the permission authority.
* @return the list of resources with a cached ID map.
*/
public static List<Resource> prepareResolveAll(final ResourceSet set, final IPermissionAuthority authority) {
if (authority != null) {
authority.setListening(false);
}
final List<Resource> cachedIdsResources = new LinkedList<Resource>();
Iterator<Resource> iterResources = set.getResources().iterator();
while (iterResources.hasNext()) {
final Resource resource = iterResources.next();
if (resource instanceof ResourceImpl && ((ResourceImpl) resource).getIntrinsicIDToEObjectMap() == null) {
((ResourceImpl) resource).setIntrinsicIDToEObjectMap(new HashMap<String, EObject>());
cachedIdsResources.add(resource);
}
}
return cachedIdsResources;
}
/**
* Reinit resources changed having a chached ID map.
*
* @param authority
* the permission authority.
* @param cachedIdsResources
* the cached ID resources.
*/
public static void unprepareResolveAll(final IPermissionAuthority authority, final List<Resource> cachedIdsResources) {
Iterator<Resource> iterResourcesBis = cachedIdsResources.iterator();
while (iterResourcesBis.hasNext()) {
final Resource resource = iterResourcesBis.next();
if (resource instanceof ResourceImpl && ((ResourceImpl) resource).getIntrinsicIDToEObjectMap() != null) {
((ResourceImpl) resource).setIntrinsicIDToEObjectMap(null);
}
}
if (authority != null) {
authority.setListening(true);
}
}
}
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