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/*******************************************************************************
* Copyright (c) 2010-2014, Marton Bur, Akos Horvath, Zoltan Ujhelyi, 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.rewriters;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;
import tools.refinery.viatra.runtime.matchers.psystem.PBody;
import tools.refinery.viatra.runtime.matchers.psystem.PConstraint;
import tools.refinery.viatra.runtime.matchers.psystem.PVariable;
import tools.refinery.viatra.runtime.matchers.psystem.basicdeferred.Equality;
import tools.refinery.viatra.runtime.matchers.psystem.basicdeferred.ExportedParameter;
import tools.refinery.viatra.runtime.matchers.psystem.basicdeferred.ExpressionEvaluation;
import tools.refinery.viatra.runtime.matchers.psystem.basicenumerables.PositivePatternCall;
import tools.refinery.viatra.runtime.matchers.psystem.queries.PQuery;
import tools.refinery.viatra.runtime.matchers.util.Preconditions;
/**
* This rewriter class can add new equality constraints to the copied body
*
* @author Marton Bur
*
*/
class FlattenerCopier extends PBodyCopier {
private final Map<PositivePatternCall, CallInformation> calls;
private static class CallInformation {
final PBody body;
final Map<PVariable, PVariable> variableMapping;
private CallInformation(PBody body) {
this.body = body;
this.variableMapping = new HashMap<>();
}
}
public FlattenerCopier(PQuery query, Map<PositivePatternCall, PBody> callsToFlatten) {
super(query);
this.calls = callsToFlatten.entrySet().stream().collect(Collectors.toMap(Entry::getKey, entry -> new CallInformation(entry.getValue())));
}
protected void copyVariable(PositivePatternCall contextPatternCall, PVariable variable, String newName) {
PVariable newPVariable = body.getOrCreateVariableByName(newName);
calls.get(contextPatternCall).variableMapping.put(variable, newPVariable);
variableMapping.put(variable, newPVariable);
}
/**
* Merge all variables and constraints from the body called through the given pattern call to a target body. If
* multiple bodies are merged into a single one, use the renamer and filter options to avoid collisions.
*
* @param sourceBody
* @param namingTool
* @param filter
*/
public void mergeBody(PositivePatternCall contextPatternCall, IVariableRenamer namingTool,
IConstraintFilter filter) {
PBody sourceBody = calls.get(contextPatternCall).body;
// Copy variables
Set<PVariable> allVariables = sourceBody.getAllVariables();
for (PVariable pVariable : allVariables) {
if (pVariable.isUnique()) {
copyVariable(contextPatternCall, pVariable,
namingTool.createVariableName(pVariable, sourceBody.getPattern()));
}
}
// Copy constraints which are not filtered
Set<PConstraint> constraints = sourceBody.getConstraints();
for (PConstraint pConstraint : constraints) {
if (!(pConstraint instanceof ExportedParameter) && !filter.filter(pConstraint)) {
copyConstraint(pConstraint);
}
}
}
@Override
protected void copyPositivePatternCallConstraint(PositivePatternCall positivePatternCall) {
if (!calls.containsKey(positivePatternCall)) {
// If the call was not flattened, copy the constraint
super.copyPositivePatternCallConstraint(positivePatternCall);
} else {
PBody calledBody = Objects.requireNonNull(calls.get(positivePatternCall).body);
Preconditions.checkArgument(positivePatternCall.getReferredQuery().equals(calledBody.getPattern()));
List<PVariable> symbolicParameters = calledBody.getSymbolicParameterVariables();
Object[] elements = positivePatternCall.getVariablesTuple().getElements();
for (int i = 0; i < elements.length; i++) {
// Create equality constraints between the caller PositivePatternCall and the corresponding body
// parameter variables
createEqualityConstraint((PVariable) elements[i], symbolicParameters.get(i), positivePatternCall);
}
}
}
private void createEqualityConstraint(PVariable pVariable1, PVariable pVariable2,
PositivePatternCall contextPatternCall) {
PVariable who = variableMapping.get(pVariable1);
PVariable withWhom = calls.get(contextPatternCall).variableMapping.get(pVariable2);
addTrace(contextPatternCall, new Equality(body, who, withWhom));
}
@Override
protected void copyExpressionEvaluationConstraint(final ExpressionEvaluation expressionEvaluation) {
Map<PVariable, PVariable> variableMapping = this.variableMapping.entrySet().stream()
.filter(input -> expressionEvaluation.getPSystem().getAllVariables().contains(input.getKey()))
.collect(Collectors.toMap(Entry::getKey, Entry::getValue));
PVariable mappedOutputVariable = variableMapping.get(expressionEvaluation.getOutputVariable());
addTrace(expressionEvaluation, new ExpressionEvaluation(body, new VariableMappingExpressionEvaluatorWrapper(expressionEvaluation.getEvaluator(), variableMapping), mappedOutputVariable, expressionEvaluation.isUnwinding()));
}
}
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