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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.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import tools.refinery.viatra.runtime.matchers.psystem.PBody;
import tools.refinery.viatra.runtime.matchers.psystem.PVariable;
import tools.refinery.viatra.runtime.matchers.psystem.VariableDeferredPConstraint;
/**
* @author Gabor Bergmann
*
*/
public class Inequality extends VariableDeferredPConstraint {
private PVariable who;
private PVariable withWhom;
/**
* The inequality constraint is weak if it can be ignored when who is the same as withWhom, or if any if them is
* undeducible.
*/
private boolean weak;
public Inequality(PBody pBody, PVariable who, PVariable withWhom) {
this(pBody, who, withWhom, false);
}
public Inequality(PBody pBody, PVariable who, PVariable withWhom,
boolean weak) {
super(pBody, new HashSet<>(Arrays.asList(who, withWhom) ));
this.who = who;
this.withWhom = withWhom;
this.weak = weak;
}
// private Inequality(
// PSystem<PatternDescription, StubHandle, ?> pSystem,
// PVariable subject, Set<PVariable> inequals)
// {
// super(pSystem, include(inequals, subject));
// this.subject = subject;
// this.inequals = inequals;
// }
// private static HashSet<PVariable> include(Set<PVariable> inequals, PVariable subject) {
// HashSet<PVariable> hashSet = new HashSet<PVariable>(inequals);
// hashSet.add(subject);
// return hashSet;
// }
@Override
public Set<PVariable> getDeferringVariables() {
return getAffectedVariables();
}
// private static int[] mapIndices(Map<Object, Integer> variablesIndex, Set<PVariable> keys) {
// int[] result = new int[keys.size()];
// int k = 0;
// for (PVariable key : keys) {
// result[k++] = variablesIndex.get(key);
// }
// return result;
// }
// @Override
// public IFoldablePConstraint getIncorporator() {
// return incorporator;
// }
//
// @Override
// public void registerIncorporatationInto(IFoldablePConstraint incorporator) {
// this.incorporator = incorporator;
// }
//
// @Override
// public boolean incorporate(IFoldablePConstraint other) {
// if (other instanceof Inequality<?, ?>) {
// Inequality other2 = (Inequality) other;
// if (subject.equals(other2.subject)) {
// Set<PVariable> newInequals = new HashSet<PVariable>(inequals);
// newInequals.addAll(other2.inequals);
// return new Inequality<PatternDescription, StubHandle>(buildable, subject, newInequals);
// }
// } else return false;
// }
@Override
protected String toStringRest() {
return who.toString() + (isWeak() ? "!=?" : "!=") + withWhom.toString();
}
@Override
public void doReplaceVariable(PVariable obsolete, PVariable replacement) {
if (obsolete.equals(who))
who = replacement;
if (obsolete.equals(withWhom))
withWhom = replacement;
}
@Override
public Set<PVariable> getDeducedVariables() {
return Collections.emptySet();
}
/**
* The inequality constraint is weak if it can be ignored when who is the same as withWhom, or if any if them is
* undeducible.
*
* @return the weak
*/
public boolean isWeak() {
return weak;
}
/**
* A weak inequality constraint is eliminable if who is the same as withWhom, or if any if them is undeducible.
*/
public boolean isEliminable() {
return isWeak() && (who.equals(withWhom) || !who.isDeducable() || !withWhom.isDeducable());
}
/**
* Eliminates a weak inequality constraint if it can be ignored when who is the same as withWhom, or if any if them
* is undeducible.
*/
public void eliminateWeak() {
if (isEliminable())
delete();
}
public PVariable getWho() {
return who;
}
public PVariable getWithWhom() {
return withWhom;
}
}
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