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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.basicenumerables;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import tools.refinery.viatra.runtime.matchers.context.IQueryMetaContext;
import tools.refinery.viatra.runtime.matchers.psystem.KeyedEnumerablePConstraint;
import tools.refinery.viatra.runtime.matchers.psystem.PBody;
import tools.refinery.viatra.runtime.matchers.psystem.PVariable;
import tools.refinery.viatra.runtime.matchers.tuple.Tuples;
/**
* @author Gabor Bergmann
*
*/
public class ConstantValue extends KeyedEnumerablePConstraint<Object> {
private PVariable variable;
public ConstantValue(PBody pBody, PVariable variable, Object value) {
super(pBody, Tuples.staticArityFlatTupleOf(variable), value);
this.variable = variable;
}
@Override
protected String keyToString() {
return supplierKey.toString();
}
/**
* @since 1.7
*/
public PVariable getVariable() {
return variable;
}
@Override
public Map<Set<PVariable>, Set<PVariable>> getFunctionalDependencies(IQueryMetaContext context) {
final Map<Set<PVariable>, Set<PVariable>> result = new HashMap<Set<PVariable>, Set<PVariable>>();
final Set<PVariable> emptySet = Collections.emptySet(); // a constant value is functionally determined by everything
result.put(emptySet, Collections.singleton(getVariableInTuple(0)));
return result;
}
}
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