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package org.etsi.mts.tdl.graphical.labels.linking;
import java.util.Collections;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.xtext.linking.impl.DefaultLinkingService;
import org.eclipse.xtext.linking.impl.IllegalNodeException;
import org.eclipse.xtext.naming.IQualifiedNameConverter;
import org.eclipse.xtext.naming.QualifiedName;
import org.eclipse.xtext.nodemodel.INode;
import org.eclipse.xtext.resource.IEObjectDescription;
import org.eclipse.xtext.scoping.IScope;
import org.etsi.mts.tdl.DataUse;
import org.etsi.mts.tdl.tdlPackage;
import com.google.inject.Inject;
public class ContextAwareLinkingService extends DefaultLinkingService {
private Map<EClass, AlternativeContext> alternativeContexts;
@Inject
private IQualifiedNameConverter qualifiedNameConverter;
@Override
public List<EObject> getLinkedObjects(EObject context, EReference ref, INode node) throws IllegalNodeException {
final EClass requiredType = ref.getEReferenceType();
if (requiredType == null)
return Collections.<EObject> emptyList();
final String crossRefString = getCrossRefNodeAsString(node);
if (crossRefString != null && !crossRefString.equals("")) {
QualifiedName qualifiedLinkName = qualifiedNameConverter.toQualifiedName(crossRefString);
IScope scope = getScope(context, ref);
Iterable<IEObjectDescription> eObjectDescriptions = scope.getElements(qualifiedLinkName);
if (context instanceof DataUse && !eObjectDescriptions.iterator().hasNext()) {
AlternativeContext alternative = getAlternativeContext(context);
if (alternative != null) {
//Keeps track of current object in the resource
EObject current = context;
for (int i = 0; i < alternative.classes.length; i++) {
EObject alternativeContext = EcoreUtil.create(alternative.classes[i]);
//Add new object to resource
EcoreUtil.replace(current, alternativeContext);
current = alternativeContext;
IScope alternativeScope = getScope(alternativeContext, alternative.references[i]);
Iterable<IEObjectDescription> altEObjectDescriptions = alternativeScope.getElements(qualifiedLinkName);
if (altEObjectDescriptions.iterator().hasNext()) {
alternative.copy(context, alternativeContext);
context = alternativeContext;
ref = alternative.references[i];
scope = alternativeScope;
eObjectDescriptions = altEObjectDescriptions;
break;
}
}
if (context != current)
//No alternative match, restore original
EcoreUtil.replace(current, context);
}
}
Iterator<IEObjectDescription> iter = eObjectDescriptions.iterator();
if (iter.hasNext()) {
IEObjectDescription eObjectDescription = iter.next();
EObject linkedObject = eObjectDescription.getEObjectOrProxy();
if (!iter.hasNext() || !ref.isMany()) {
// If we replaced the context object above then we need to
// set this association here or it will be lost
context.eSet(ref, linkedObject);
return Collections.singletonList(linkedObject);
}
}
}
return Collections.emptyList();
}
public AlternativeContext getAlternativeContext(EObject contextObject) {
if (alternativeContexts == null) {
alternativeContexts = new Hashtable<EClass, AlternativeContext>();
AlternativeContext dataUseContexts = new AlternativeContext() {
@Override
void copy(EObject from, EObject to) {
((DataUse)to).getReduction().addAll(((DataUse)from).getReduction());
((DataUse)to).getArgument().addAll(((DataUse)from).getArgument());
}
};
dataUseContexts.classes = new EClass[]{
tdlPackage.eINSTANCE.getDataInstanceUse(),
tdlPackage.eINSTANCE.getFunctionCall(),
tdlPackage.eINSTANCE.getPredefinedFunctionCall(),
tdlPackage.eINSTANCE.getVariableUse(),
tdlPackage.eINSTANCE.getFormalParameterUse()
};
dataUseContexts.references = new EReference[]{
tdlPackage.eINSTANCE.getDataInstanceUse_DataInstance(),
tdlPackage.eINSTANCE.getFunctionCall_Function(),
tdlPackage.eINSTANCE.getPredefinedFunctionCall_Function(),
tdlPackage.eINSTANCE.getVariableUse_Variable(),
tdlPackage.eINSTANCE.getFormalParameterUse_Parameter()
};
alternativeContexts.put(tdlPackage.eINSTANCE.getDataUse(), dataUseContexts);
}
for (EClass alternativeClass: alternativeContexts.keySet())
if (alternativeClass.isInstance(contextObject))
return alternativeContexts.get(alternativeClass);
return null;
}
}
abstract class AlternativeContext {
EClass[] classes;
EReference[] references;
abstract void copy(EObject from, EObject to);
}