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/*******************************************************************************
* Copyright (c) 2009, 2013 E.D.Willink and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* E.D.Willink - Initial API and implementation
*******************************************************************************/
package org.eclipse.ocl.examples.library.iterator;
import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
import org.eclipse.ocl.examples.domain.elements.DomainType;
import org.eclipse.ocl.examples.domain.evaluation.DomainEvaluator;
import org.eclipse.ocl.examples.domain.evaluation.DomainIterationManager;
import org.eclipse.ocl.examples.domain.ids.CollectionTypeId;
import org.eclipse.ocl.examples.domain.ids.TypeId;
import org.eclipse.ocl.examples.domain.library.AbstractIteration;
import org.eclipse.ocl.examples.domain.values.CollectionValue;
import org.eclipse.ocl.examples.domain.values.impl.InvalidValueException;
/**
* ClosureIteration realizes the Collection::closure() library iteration.
*/
public class ClosureIteration extends AbstractIteration
{
public static final @NonNull ClosureIteration INSTANCE = new ClosureIteration();
public @NonNull CollectionValue.Accumulator createAccumulatorValue(@NonNull DomainEvaluator evaluator, @NonNull TypeId accumulatorTypeId, @NonNull TypeId bodyTypeId) {
return createCollectionAccumulatorValue((CollectionTypeId) accumulatorTypeId);
}
/**
* Recursively evaluates the iterator body expression.
* @throws Exception
*/
@Override
protected @Nullable Object updateAccumulator(@NonNull DomainIterationManager iterationManager) {
// The parent is the iterator
Object value = iterationManager.get();
CollectionValue.Accumulator accumulatorValue = (CollectionValue.Accumulator)iterationManager.getAccumulatorValue();
assert accumulatorValue != null;
if (!accumulatorValue.add(value)) {
return CARRY_ON;
}
Object bodyVal = iterationManager.evaluateBody();
if (bodyVal instanceof InvalidValueException) {
throw (InvalidValueException)bodyVal; // FIXME Analyze away
}
if (bodyVal == null) {
return iterationManager.getAccumulatorValue(); // Null body is termination
}
CollectionValue collectionValue;
if (bodyVal instanceof CollectionValue) {
collectionValue = (CollectionValue) bodyVal;
}
else {
DomainEvaluator evaluator = iterationManager.getEvaluator();
DomainType elementType = evaluator.getStaticTypeOf(bodyVal);
CollectionTypeId sequenceId = TypeId.SEQUENCE.getSpecializedId(elementType.getTypeId());
collectionValue = evaluator.getIdResolver().createSequenceOfEach(sequenceId, bodyVal);
}
evaluateIteration(iterationManager.createNestedIterationManager(collectionValue));
return CARRY_ON;
}
}