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/*******************************************************************************
* Copyright (c) 2010-2016, Grill Balázs, IncQuery Labs Ltd.
* 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.LinkedHashMap;
import java.util.Map;
import tools.refinery.viatra.runtime.matchers.psystem.IExpressionEvaluator;
import tools.refinery.viatra.runtime.matchers.psystem.IValueProvider;
import tools.refinery.viatra.runtime.matchers.psystem.PVariable;
import tools.refinery.viatra.runtime.matchers.util.Preconditions;
/**
* A wrapper for {@link IExpressionEvaluator} which is capable of correctly mapping variable names used by the
* expression.
*
* @author Grill Balázs
*
*/
class VariableMappingExpressionEvaluatorWrapper implements IExpressionEvaluator {
private final IExpressionEvaluator wrapped;
private final Map<String, String> variableMapping;
public VariableMappingExpressionEvaluatorWrapper(IExpressionEvaluator wrapped,
Map<PVariable, PVariable> variableMapping) {
// Support to rewrap an already wrapped expression.
boolean rewrap = wrapped instanceof VariableMappingExpressionEvaluatorWrapper;
this.wrapped = rewrap ? ((VariableMappingExpressionEvaluatorWrapper)wrapped).wrapped : wrapped;
// Instead of just saving the reference of the mapping, save the actual (trimmed) state of the mapping as it
// may change during copying (especially during flattening). A LinkedHashMap is used to retain ordering of
// original parameter names iterator.
this.variableMapping = new LinkedHashMap<>();
// Index map by variable names
Map<String, PVariable> names = new HashMap<>();
for (PVariable originalVar : variableMapping.keySet()) {
names.put(originalVar.getName(), originalVar);
}
// In case of rewrapping, current names are contained by the previous mapping
Map<String, String> previousMapping = null;
if (rewrap){
previousMapping = ((VariableMappingExpressionEvaluatorWrapper)wrapped).variableMapping;
}
// Populate mapping
for (String inputParameterName : this.wrapped.getInputParameterNames()) {
String parameterName = rewrap ? previousMapping.get(inputParameterName) : inputParameterName;
Preconditions.checkArgument(parameterName != null);
PVariable original = names.get(parameterName);
Preconditions.checkArgument(original != null);
PVariable mapped = variableMapping.get(original);
if (mapped != null){
this.variableMapping.put(inputParameterName, mapped.getName());
}
}
}
@Override
public String getShortDescription() {
return wrapped.getShortDescription();
}
@Override
public Iterable<String> getInputParameterNames() {
return variableMapping.values();
}
@Override
public Object evaluateExpression(final IValueProvider provider) throws Exception {
return wrapped.evaluateExpression(variableName -> {
String mappedVariableName = variableMapping.get(variableName);
Preconditions.checkArgument(mappedVariableName != null, "Could not find variable %s", variableName);
return provider.getValue(mappedVariableName);
});
}
}
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