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/*******************************************************************************
* Copyright (c) 2010-2014, 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.planning.operations;
import java.util.Collections;
import java.util.Set;
import tools.refinery.viatra.runtime.matchers.psystem.PConstraint;
/**
* Represents a natural join of two parent SubPlans.
* @author Bergmann Gabor
*
*/
public class PJoin extends POperation {
// // TODO leave here? is this a problem in equivalnece checking?
// private Set<PVariable> onVariables;
public PJoin(/*Set<PVariable> onVariables*/) {
super();
//this.onVariables = new HashSet<PVariable>(onVariables);
}
// public Set<PVariable> getOnVariables() {
// return onVariables;
// }
@Override
public Set<? extends PConstraint> getDeltaConstraints() {
return Collections.emptySet();
}
@Override
public int numParentSubPlans() {
return 2;
}
@Override
public String getShortName() {
return "JOIN"; //String.format("JOIN_{%s}", Joiner.on(",").join(onVariables));
}
@Override
public int hashCode() {
return getClass().hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (!(obj instanceof PJoin))
return false;
return true;
}
}
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