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/*******************************************************************************
* Copyright (c) 2010-2018, Gabor Bergmann, IncQuery Labs Ltd.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.tabular;
import java.util.Collections;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EClassifier;
import org.eclipse.emf.ecore.EDataType;
import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.ecore.EcorePackage;
import tools.refinery.viatra.runtime.api.scope.QueryScope;
import tools.refinery.viatra.runtime.emf.EMFQueryMetaContext;
import tools.refinery.viatra.runtime.emf.EMFScope;
import tools.refinery.viatra.runtime.emf.types.EClassExactInstancesKey;
import tools.refinery.viatra.runtime.emf.types.EClassTransitiveInstancesKey;
import tools.refinery.viatra.runtime.emf.types.EDataTypeInSlotsKey;
import tools.refinery.viatra.runtime.emf.types.EStructuralFeatureInstancesKey;
import tools.refinery.viatra.runtime.matchers.context.IInputKey;
import tools.refinery.viatra.runtime.matchers.scopes.IStorageBackend;
import tools.refinery.viatra.runtime.matchers.scopes.SimpleRuntimeContext;
import tools.refinery.viatra.runtime.matchers.scopes.tables.DisjointUnionTable;
import tools.refinery.viatra.runtime.matchers.scopes.tables.ITableWriterBinary;
import tools.refinery.viatra.runtime.matchers.scopes.tables.ITableWriterUnary;
import tools.refinery.viatra.runtime.matchers.util.CollectionsFactory;
/**
* Simple EMF-specific demo tabular index host.
*
* <p> Usage: <ul>
* <li> First, instantiate index host with given Ecore metamodel packages
* <li> To emulate an EMF instance model, write arbitrary content into the tables using {@link #getTableDirectInstances(EClassifier)} and {@link #getTableFeatureSlots(EStructuralFeature)}.
* <li> Initialize and evaluate regular EMF-based Viatra queries on the scope provided by {@link #getScope()}, as you would on an {@link EMFScope}.
* <ul>
*
* <p>
* <strong>EXPERIMENTAL</strong>. This class or interface has been added as
* part of a work in progress. There is no guarantee that this API will
* work or that it will remain the same.
*
* @author Gabor Bergmann
* @since 2.1
*/
public class EcoreIndexHost extends TabularIndexHost {
public EcoreIndexHost(IStorageBackend storage, EPackage... packages) {
super(storage, new SimpleRuntimeContext(EMFQueryMetaContext.DEFAULT_SURROGATE));
initTables(packages);
}
@Override
protected boolean isQueryScopeEmulated(Class<? extends QueryScope> queryScopeClass) {
return EMFScope.class.equals(queryScopeClass);
}
private Map<EClassifier, ITableWriterUnary.Table<Object>> tableDirectInstances = CollectionsFactory.createMap();
private Map<EClass, DisjointUnionTable> tableTransitiveInstances = CollectionsFactory.createMap();
private Map<EStructuralFeature, ITableWriterBinary.Table<Object, Object>> tableFeatures = CollectionsFactory.createMap();
private void initTables(EPackage[] packages) {
// create instance tables first
for (EPackage ePackage : packages) {
for (EClassifier eClassifier : ePackage.getEClassifiers()) {
boolean unique;
IInputKey classifierKey;
if (eClassifier instanceof EClass) {
EClass eClass = (EClass) eClassifier;
// create transitive instances table
IInputKey transitiveKey = new EClassTransitiveInstancesKey(eClass);
DisjointUnionTable transitiveTable = registerNewTable(new DisjointUnionTable(transitiveKey, runtimeContext));
tableTransitiveInstances.put(eClass, transitiveTable);
// process feature tables
for (EStructuralFeature feature : eClass.getEStructuralFeatures()) {
IInputKey featureKey = new EStructuralFeatureInstancesKey(feature);
ITableWriterBinary.Table<Object, Object> featureTable = newBinaryInputTable(featureKey, feature.isUnique());
tableFeatures.put(feature, featureTable);
}
// direct instance table
unique = true;
classifierKey = new EClassExactInstancesKey(eClass);
} else { // datatype
unique = false;
classifierKey = new EDataTypeInSlotsKey((EDataType) eClassifier);
}
ITableWriterUnary.Table<Object> directTable = newUnaryInputTable(classifierKey, unique);
tableDirectInstances.put(eClassifier, directTable);
}
}
// global implicit supertype EObject is always available as a transitive table
EClass eObjectClass = EcorePackage.eINSTANCE.getEObject();
DisjointUnionTable eObjectAllInstancesTable = tableTransitiveInstances.get(eObjectClass);
if (eObjectAllInstancesTable == null) { // is it already added?
IInputKey transitiveKey = new EClassTransitiveInstancesKey(eObjectClass);
eObjectAllInstancesTable = registerNewTable(new DisjointUnionTable(transitiveKey, runtimeContext));
tableTransitiveInstances.put(eObjectClass, eObjectAllInstancesTable);
boolean unique = true;
IInputKey classifierKey = new EClassExactInstancesKey(eObjectClass);
ITableWriterUnary.Table<Object> directTable = newUnaryInputTable(classifierKey, unique);
tableDirectInstances.put(eObjectClass, directTable);
}
// set up disjoint unoin tables
for (Entry<EClass, DisjointUnionTable> entry : tableTransitiveInstances.entrySet()) {
EClass eClass = entry.getKey();
ITableWriterUnary.Table<Object> directTable = tableDirectInstances.get(eClass);
// the direct type itself is a child
entry.getValue().addChildTable(directTable);
// connect supertypes
for (EClass superClass : eClass.getEAllSuperTypes()) {
DisjointUnionTable transitiveTable = tableTransitiveInstances.get(superClass);
if (transitiveTable == null) {
throw new IllegalStateException(
String.format("No index table found for EClass %s, supertype of %s",
superClass.getName(), eClass.getName())
);
}
transitiveTable.addChildTable(directTable);
}
// global implicit supertype
if (!eClass.equals(eObjectClass)) {
eObjectAllInstancesTable.addChildTable(directTable);
}
}
}
public ITableWriterUnary.Table<Object> getTableDirectInstances(EClassifier classifier) {
return tableDirectInstances.get(classifier);
}
public ITableWriterBinary.Table<Object, Object> getTableFeatureSlots(EStructuralFeature feature) {
return tableFeatures.get(feature);
}
public Set<Entry<EClassifier, ITableWriterUnary.Table<Object>>> getAllCurrentTablesDirectInstances() {
return Collections.unmodifiableSet(tableDirectInstances.entrySet());
}
public Set<Entry<EStructuralFeature, ITableWriterBinary.Table<Object, Object>>> getAllCurrentTablesFeatures() {
return Collections.unmodifiableSet(tableFeatures.entrySet());
}
}
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