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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.Collections;
import java.util.Set;
import tools.refinery.viatra.runtime.matchers.planning.QueryProcessingException;
import tools.refinery.viatra.runtime.matchers.psystem.PBody;
import tools.refinery.viatra.runtime.matchers.psystem.PVariable;
import tools.refinery.viatra.runtime.matchers.psystem.VariableDeferredPConstraint;
import tools.refinery.viatra.runtime.matchers.psystem.queries.PParameter;
import tools.refinery.viatra.runtime.matchers.psystem.queries.PQuery;
/**
* @author Gabor Bergmann
*
*/
public class ExportedParameter extends VariableDeferredPConstraint {
PVariable parameterVariable;
final String parameterName;
final PParameter patternParameter;
/**
* @since 1.4
*/
public ExportedParameter(PBody pBody, PVariable parameterVariable, PParameter patternParameter) {
super(pBody, Collections.singleton(parameterVariable));
this.parameterVariable = parameterVariable;
this.patternParameter = patternParameter;
parameterName = patternParameter.getName();
}
@Override
public void doReplaceVariable(PVariable obsolete, PVariable replacement) {
if (obsolete.equals(parameterVariable))
parameterVariable = replacement;
}
@Override
protected String toStringRest() {
Object varName = parameterVariable.getName();
return parameterName.equals(varName) ? parameterName : parameterName + "(" + varName + ")";
}
@Override
public Set<PVariable> getDeducedVariables() {
return Collections.emptySet();
}
/**
* The name of the parameter; usually, it is expected that {@link #getParameterVariable()} is more useful, except
* maybe for debugging purposes.
*
* @return a non-null name of the parameter
*/
public String getParameterName() {
return parameterName;
}
public PVariable getParameterVariable() {
return parameterVariable;
}
/**
* @since 1.4
*/
public PParameter getPatternParameter() {
if (patternParameter == null) {
PQuery query = pBody.getPattern();
Integer index = query.getPositionOfParameter(parameterName);
if (index == null) {
throw new IllegalStateException(String.format("Pattern %s does not have a parameter named %s",
query.getFullyQualifiedName(), parameterName));
}
return query.getParameters().get(index);
} else {
return patternParameter;
}
}
@Override
public Set<PVariable> getDeferringVariables() {
return Collections.singleton(parameterVariable);
}
@Override
public void checkSanity() {
super.checkSanity();
if (!parameterVariable.isDeducable()) {
String[] args = { parameterName };
String msg = "Impossible to match pattern: "
+ "exported pattern variable {1} can not be determined based on the pattern constraints. "
+ "HINT: certain constructs (e.g. negative patterns or check expressions) cannot output symbolic parameters.";
String shortMsg = "Could not deduce value of parameter";
throw new QueryProcessingException(msg, args, shortMsg, null);
}
}
}
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