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/*******************************************************************************
* Copyright (c) 2009, 2011 itemis AG (http://www.itemis.eu) and others.
* Copyright (c) 2024 The Refinery Authors <https://refinery.tools/>
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0.
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.language.resource;
import org.apache.log4j.Logger;
import org.eclipse.emf.common.util.TreeIterator;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.xtext.resource.IDefaultResourceDescriptionStrategy;
import org.eclipse.xtext.resource.IEObjectDescription;
import org.eclipse.xtext.resource.impl.DefaultResourceDescription;
import org.eclipse.xtext.resource.impl.EObjectDescriptionLookUp;
import org.eclipse.xtext.util.IAcceptor;
import tools.refinery.language.naming.NamingUtil;
import java.io.IOException;
import java.util.*;
/**
* A resource description that takes {@link ProblemResourceDescriptionStrategy#SHADOWING_KEY} into account when
* describing EObjects.
* <p>
* Based on {@link DefaultResourceDescription}.
*/
public class ProblemResourceDescription extends DefaultResourceDescription {
private static final Logger log = Logger.getLogger(ProblemResourceDescription.class);
private final IDefaultResourceDescriptionStrategy strategy;
public ProblemResourceDescription(Resource resource, IDefaultResourceDescriptionStrategy strategy) {
super(resource, strategy);
this.strategy = strategy;
}
/**
* Based on {@link DefaultResourceDescription#computeExportedObjects()}.
*
* @return The computed exported objects, taking shadowing into account.
*/
@Override
protected List<IEObjectDescription> computeExportedObjects() {
if (!getResource().isLoaded()) {
try {
getResource().load(null);
} catch (IOException e) {
log.error(e.getMessage(), e);
return Collections.emptyList();
}
}
final Map<ProblemResourceDescriptionStrategy.ShadowingKey, List<IEObjectDescription>> nameToDescriptionsMap =
new LinkedHashMap<>();
IAcceptor<IEObjectDescription> acceptor = eObjectDescription -> {
var key = ProblemResourceDescriptionStrategy.getShadowingKey(eObjectDescription);
var descriptions = nameToDescriptionsMap.computeIfAbsent(key, ignored -> new ArrayList<>());
descriptions.add(eObjectDescription);
};
TreeIterator<EObject> allProperContents = EcoreUtil.getAllProperContents(getResource(), false);
while (allProperContents.hasNext()) {
EObject content = allProperContents.next();
if (!strategy.createEObjectDescriptions(content, acceptor)) {
allProperContents.prune();
}
}
return omitShadowedNames(nameToDescriptionsMap);
}
private static List<IEObjectDescription> omitShadowedNames(
Map<ProblemResourceDescriptionStrategy.ShadowingKey, List<IEObjectDescription>> nameToDescriptionsMap) {
final List<IEObjectDescription> exportedEObjects = new ArrayList<>();
for (var entry : nameToDescriptionsMap.entrySet()) {
var descriptions = entry.getValue();
if (NamingUtil.isFullyQualified(entry.getKey().name())) {
exportedEObjects.addAll(descriptions);
} else {
boolean foundPreferred = false;
for (var description : descriptions) {
if (ProblemResourceDescriptionStrategy.PREFERRED_NAME_TRUE.equals(
description.getUserData(ProblemResourceDescriptionStrategy.PREFERRED_NAME))) {
exportedEObjects.add(description);
foundPreferred = true;
}
}
if (!foundPreferred) {
exportedEObjects.addAll(descriptions);
}
}
}
return exportedEObjects;
}
// Based on {@code DerivedStateAwareResourceDescriptionManager#createResourceDescription}.
@Override
protected EObjectDescriptionLookUp getLookUp() {
if (lookup == null) {
lookup = new EObjectDescriptionLookUp(computeExportedObjects());
}
return lookup;
}
}
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