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/*******************************************************************************
* Copyright (c) 2010-2015, Marton Bur, Zoltan Ujhelyi, Akos Horvath, Istvan Rath and Daniel Varro
* 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.localsearch.operations.extend.nobase;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.eclipse.emf.ecore.EAttribute;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EDataType;
import org.eclipse.emf.ecore.EObject;
import tools.refinery.viatra.runtime.base.api.NavigationHelper;
import tools.refinery.viatra.runtime.emf.EMFScope;
import tools.refinery.viatra.runtime.emf.types.EDataTypeInSlotsKey;
import tools.refinery.viatra.runtime.localsearch.MatchingFrame;
import tools.refinery.viatra.runtime.localsearch.matcher.ISearchContext;
import tools.refinery.viatra.runtime.localsearch.operations.IIteratingSearchOperation;
import tools.refinery.viatra.runtime.localsearch.operations.ISearchOperation;
import tools.refinery.viatra.runtime.matchers.context.IInputKey;
import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
import tools.refinery.viatra.runtime.matchers.tuple.Tuples;
import tools.refinery.viatra.runtime.matchers.util.CollectionsFactory;
/**
* Iterates over all {@link EDataType} instances without using an {@link NavigationHelper VIATRA Base indexer}.
*
*/
public class IterateOverEDatatypeInstances implements IIteratingSearchOperation {
private class Executor extends AbstractIteratingExtendOperationExecutor<Object> {
public Executor(int position, EMFScope scope) {
super(position, scope);
}
@Override
public Iterator<? extends Object> getIterator(MatchingFrame frame, final ISearchContext context) {
return getModelContents().filter(EObject.class::isInstance).map(EObject.class::cast)
.map(input -> doGetEAttributes(input.eClass(), context)
.map(attribute -> {
if (attribute.isMany()) {
return ((List<?>) input.eGet(attribute)).stream();
} else {
Object o = input.eGet(attribute);
return o == null ? Stream.empty() : Stream.of(o);
}
}))
.flatMap(i -> i)
.<Object>flatMap(i -> i)
.iterator();
}
@Override
public ISearchOperation getOperation() {
return IterateOverEDatatypeInstances.this;
}
}
private final EDataType dataType;
private final int position;
private final EMFScope scope;
public IterateOverEDatatypeInstances(int position, EDataType dataType, EMFScope scope) {
this.position = position;
this.dataType = dataType;
this.scope = scope;
}
protected Stream<EAttribute> doGetEAttributes(EClass eclass, ISearchContext context){
@SuppressWarnings({ "unchecked"})
Map<Tuple, Set<EAttribute>> cache = context.accessBackendLevelCache(getClass(), Map.class, CollectionsFactory::createMap);
Tuple compositeKey = Tuples.staticArityFlatTupleOf(dataType, eclass);
return cache.computeIfAbsent(compositeKey, k ->
eclass.getEAllAttributes().stream().filter(input -> Objects.equals(input.getEType(), dataType)).collect(Collectors.toSet())
).stream();
}
public EDataType getDataType() {
return dataType;
}
@Override
public ISearchOperationExecutor createExecutor() {
return new Executor(position, scope);
}
@Override
public String toString() {
return toString(Object::toString);
}
@Override
public String toString(Function<Integer, String> variableMapping) {
return "extend "+dataType.getName()+"(-"+variableMapping.apply(position)+") iterating";
}
@Override
public List<Integer> getVariablePositions() {
return Collections.singletonList(position);
}
/**
* @since 1.4
*/
@Override
public IInputKey getIteratedInputKey() {
return new EDataTypeInSlotsKey(dataType);
}
}
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