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/*******************************************************************************
* Copyright (c) 2010-2014, Zoltan Ujhelyi, 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.matchers.psystem.queries;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.stream.Collectors;
import tools.refinery.viatra.runtime.matchers.psystem.PBody;
/**
*
* A disjunction is a set of bodies representing separate conditions. A {@link PQuery} has a single, canonical
* PDisjunction, that can be replaced using rewriter
*
* @author Zoltan Ujhelyi
*
*/
public class PDisjunction {
private Set<PBody> bodies;
private PQuery query;
public PDisjunction(Set<PBody> bodies) {
this(bodies.iterator().next().getPattern(), bodies);
}
public PDisjunction(PQuery query, Set<PBody> bodies) {
super();
this.query = query;
this.bodies = Collections.unmodifiableSet(new LinkedHashSet<>(bodies));
this.bodies.forEach(body -> body.setContainerDisjunction(this));
}
/**
* Returns an immutable set of bodies that consists of this disjunction
*
* @return the bodies
*/
public Set<PBody> getBodies() {
return bodies;
}
/**
* Returns the corresponding query specification. May be null if not set.
*/
public PQuery getQuery() {
return query;
}
/**
* Returns all queries directly referred in the constraints. They are all required to evaluate this query
*
* @return a non-null, but possibly empty list of query definitions
*/
public Set<PQuery> getDirectReferredQueries() {
return this.getBodies().stream().
flatMap(PQueries.directlyReferencedQueriesFunction()). // flatten stream of streams
collect(Collectors.toCollection(LinkedHashSet::new));
}
/**
* Returns all queries required to evaluate this query (transitively).
*
* @return a non-null, but possibly empty list of query definitions
*/
public Set<PQuery> getAllReferredQueries() {
Set<PQuery> processedQueries = new LinkedHashSet<>();
processedQueries.add(this.getQuery());
Set<PQuery> foundQueries = getDirectReferredQueries();
Set<PQuery> newQueries = new LinkedHashSet<>(foundQueries);
while(!processedQueries.containsAll(newQueries)) {
PQuery query = newQueries.iterator().next();
processedQueries.add(query);
newQueries.remove(query);
Set<PQuery> referred = query.getDirectReferredQueries();
referred.removeAll(processedQueries);
foundQueries.addAll(referred);
newQueries.addAll(referred);
}
return foundQueries;
}
/**
* Decides whether a disjunction is mutable. A disjunction is mutable if all its contained bodies are mutable.
*
*/
public boolean isMutable() {
for (PBody body : bodies) {
if (!body.isMutable()) {
return false;
}
}
return true;
}
}
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