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/*******************************************************************************
* Copyright (c) 2010-2015, Bergmann Gabor, 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.basicdeferred;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import tools.refinery.viatra.runtime.matchers.context.IInputKey;
import tools.refinery.viatra.runtime.matchers.context.IQueryMetaContext;
import tools.refinery.viatra.runtime.matchers.psystem.ITypeConstraint;
import tools.refinery.viatra.runtime.matchers.psystem.PBody;
import tools.refinery.viatra.runtime.matchers.psystem.PVariable;
import tools.refinery.viatra.runtime.matchers.psystem.TypeJudgement;
import tools.refinery.viatra.runtime.matchers.psystem.VariableDeferredPConstraint;
import tools.refinery.viatra.runtime.matchers.psystem.basicenumerables.TypeConstraint;
import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
/**
* Represents a non-enumerable type constraint that asserts that values substituted for the given tuple of variables
* form a tuple that belongs to a (typically non-enumerable) extensional relation identified by an {@link IInputKey}.
*
* <p> The InputKey is typically not enumerable. If it is enumerable, use {@link TypeConstraint} instead, so that the PConstraint carries over the property of enumerability.
*
* @author Bergmann Gabor
*
*/
public class TypeFilterConstraint extends VariableDeferredPConstraint implements
ITypeConstraint {
private Tuple variablesTuple;
private IInputKey inputKey;
private TypeJudgement equivalentJudgement;
public TypeFilterConstraint(PBody pBody, Tuple variablesTuple, IInputKey inputKey) {
super(pBody, variablesTuple.<PVariable> getDistinctElements());
this.equivalentJudgement = new TypeJudgement(inputKey, variablesTuple);
this.variablesTuple = variablesTuple;
this.inputKey = inputKey;
if (variablesTuple.getSize() != inputKey.getArity())
throw new IllegalArgumentException(
this.getClass().getSimpleName() +
" applied for variable tuple " + variablesTuple + " having wrong arity for input key " +
inputKey);
}
public Tuple getVariablesTuple() {
return variablesTuple;
}
public IInputKey getInputKey() {
return inputKey;
}
@Override
public TypeJudgement getEquivalentJudgement() {
return equivalentJudgement;
}
@Override
protected void doReplaceVariable(PVariable obsolete, PVariable replacement) {
variablesTuple = variablesTuple.replaceAll(obsolete, replacement);
this.equivalentJudgement = new TypeJudgement(inputKey, variablesTuple);
}
@Override
public Set<TypeJudgement> getImpliedJudgements(IQueryMetaContext context) {
return Collections.singleton(equivalentJudgement);
}
@Override
public Set<PVariable> getDeducedVariables() {
return Collections.emptySet();
}
@Override
public Set<PVariable> getDeferringVariables() {
return getAffectedVariables();
}
@Override
protected String toStringRest() {
return inputKey.getPrettyPrintableName() + "@" + variablesTuple;
}
@Override
public Map<Set<PVariable>, Set<PVariable>> getFunctionalDependencies(IQueryMetaContext context) {
return TypeConstraintUtil.getFunctionalDependencies(context, inputKey, variablesTuple);
}
}
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