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/*******************************************************************************
* Copyright (c) 2010-2013, 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;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.function.Function;
import org.eclipse.emf.ecore.EClass;
import tools.refinery.viatra.runtime.emf.types.EClassTransitiveInstancesKey;
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.context.IQueryRuntimeContext;
import tools.refinery.viatra.runtime.matchers.tuple.TupleMask;
import tools.refinery.viatra.runtime.matchers.tuple.Tuples;
/**
* Iterates all available {@link EClass} instances using an {@link IQueryRuntimeContext VIATRA Base indexer}. It is
* assumed that the base indexer has been registered for the selected type.
*
* @author Zoltan Ujhelyi
*
*/
public class IterateOverEClassInstances implements IIteratingSearchOperation {
private class Executor extends SingleValueExtendOperationExecutor<Object> {
public Executor(int position) {
super(position);
}
@Override
public Iterator<? extends Object> getIterator(MatchingFrame frame, ISearchContext context) {
return context.getRuntimeContext().enumerateValues(type, indexerMask, Tuples.staticArityFlatTupleOf()).iterator();
}
@Override
public ISearchOperation getOperation() {
return IterateOverEClassInstances.this;
}
}
private final EClass clazz;
private final EClassTransitiveInstancesKey type;
private static final TupleMask indexerMask = TupleMask.empty(1);
private final int position;
public IterateOverEClassInstances(int position, EClass clazz) {
this.position = position;
this.clazz = clazz;
type = new EClassTransitiveInstancesKey(clazz);
}
public EClass getClazz() {
return clazz;
}
@Override
public ISearchOperationExecutor createExecutor() {
return new Executor(position);
}
@Override
public String toString() {
return toString(Object::toString);
}
@Override
public String toString(Function<Integer, String> variableMapping) {
return "extend "+clazz.getName()+"(-"+ variableMapping.apply(position)+") indexed";
}
@Override
public List<Integer> getVariablePositions() {
return Collections.singletonList(position);
}
/**
* @since 1.4
*/
@Override
public IInputKey getIteratedInputKey() {
return type;
}
}
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