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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.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import tools.refinery.viatra.runtime.matchers.planning.SubPlan;
import tools.refinery.viatra.runtime.matchers.psystem.PConstraint;
import tools.refinery.viatra.runtime.matchers.psystem.PVariable;
import tools.refinery.viatra.runtime.matchers.util.Preconditions;
/**
* Represents a projection of a single parent SubPlan onto a limited set of variables.
* <p> May optionally prescribe an ordering of variables (List, as opposed to Set).
*
* @author Bergmann Gabor
*
*/
public class PProject extends POperation {
private Collection<PVariable> toVariables;
private boolean ordered;
public PProject(Set<PVariable> toVariables) {
super();
this.toVariables = toVariables;
this.ordered = false;
}
public PProject(List<PVariable> toVariables) {
super();
this.toVariables = toVariables;
this.ordered = true;
}
public Collection<PVariable> getToVariables() {
return toVariables;
}
public boolean isOrdered() {
return ordered;
}
@Override
public Set<? extends PConstraint> getDeltaConstraints() {
return Collections.emptySet();
}
@Override
public int numParentSubPlans() {
return 1;
}
@Override
public void checkConsistency(SubPlan subPlan) {
super.checkConsistency(subPlan);
final SubPlan parentPlan = subPlan.getParentPlans().get(0);
Preconditions.checkArgument(parentPlan.getVisibleVariables().containsAll(toVariables),
() -> toVariables.stream()
.filter(input -> !parentPlan.getVisibleVariables().contains(input)).map(PVariable::getName)
.collect(Collectors.joining(",", "Variables missing from project: ", "")));
}
@Override
public String getShortName() {
return String.format("PROJECT%s_{%s}", ordered? "!" : "",
toVariables.stream().map(PVariable::getName).collect(Collectors.joining(",")));
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + (ordered ? 1231 : 1237);
result = prime * result
+ ((toVariables == null) ? 0 : toVariables.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (!(obj instanceof PProject))
return false;
PProject other = (PProject) obj;
if (ordered != other.ordered)
return false;
if (toVariables == null) {
if (other.toVariables != null)
return false;
} else if (!toVariables.equals(other.toVariables))
return false;
return true;
}
}
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