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/*******************************************************************************
* Copyright (c) 2004-2010 Gabor Bergmann 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.basicdeferred;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import tools.refinery.viatra.runtime.matchers.context.IQueryMetaContext;
import tools.refinery.viatra.runtime.matchers.planning.SubPlan;
import tools.refinery.viatra.runtime.matchers.psystem.DeferredPConstraint;
import tools.refinery.viatra.runtime.matchers.psystem.PBody;
import tools.refinery.viatra.runtime.matchers.psystem.PVariable;
/**
* @author Gabor Bergmann
*
*/
public class Equality extends DeferredPConstraint {
private PVariable who;
private PVariable withWhom;
public Equality(PBody pBody, PVariable who, PVariable withWhom) {
super(pBody, buildSet(who, withWhom));
this.who = who;
this.withWhom = withWhom;
}
private static Set<PVariable> buildSet(PVariable who, PVariable withWhom) {
Set<PVariable> set = new HashSet<PVariable>();
set.add(who);
set.add(withWhom);
return set;
}
/**
* An equality is moot if it compares the a variable with itself.
*
* @return true, if the equality is moot
*/
public boolean isMoot() {
return who.equals(withWhom);
}
@Override
public void doReplaceVariable(PVariable obsolete, PVariable replacement) {
if (obsolete.equals(who))
who = replacement;
if (obsolete.equals(withWhom))
withWhom = replacement;
}
@Override
protected String toStringRest() {
return who.getName() + "=" + withWhom.getName();
}
public PVariable getWho() {
return who;
}
public PVariable getWithWhom() {
return withWhom;
}
@Override
public Set<PVariable> getDeducedVariables() {
return Collections.emptySet();
}
@Override
public Map<Set<PVariable>, Set<PVariable>> getFunctionalDependencies(IQueryMetaContext context) {
final Map<Set<PVariable>, Set<PVariable>> result = new HashMap<Set<PVariable>, Set<PVariable>>();
result.put(Collections.singleton(who), Collections.singleton(withWhom));
result.put(Collections.singleton(withWhom), Collections.singleton(who));
return result;
}
@Override
public boolean isReadyAt(SubPlan plan, IQueryMetaContext context) {
return plan.getVisibleVariables().contains(who) && plan.getVisibleVariables().contains(withWhom);
// will be replaced by || if copierNode is available;
// until then, LayoutHelper.unifyVariablesAlongEqualities(PSystem<PatternDescription, StubHandle, Collector>) is
// recommended.
}
}
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