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/*******************************************************************************
* Copyright (c) 2010-2016, Grill Balázs, IncQueryLabs
* 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.localsearch.operations.check;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.Function;
import tools.refinery.viatra.runtime.localsearch.MatchingFrame;
import tools.refinery.viatra.runtime.localsearch.matcher.ISearchContext;
import tools.refinery.viatra.runtime.localsearch.operations.CheckOperationExecutor;
import tools.refinery.viatra.runtime.localsearch.operations.ISearchOperation;
import tools.refinery.viatra.runtime.localsearch.operations.MatchingFrameValueProvider;
import tools.refinery.viatra.runtime.matchers.psystem.IExpressionEvaluator;
/**
* @author Grill Balázs
* @since 1.3
* @noextend This class is not intended to be subclassed by clients.
*/
public class ExpressionEvalCheck implements ISearchOperation {
private class Executor extends CheckOperationExecutor {
@Override
protected boolean check(MatchingFrame frame, ISearchContext context) {
try {
Object result = evaluator.evaluateExpression(new MatchingFrameValueProvider(frame, nameMap));
if (!unwind && result != null) {
Object currentValue = frame.get(outputPosition);
return result.equals(currentValue);
} else if (unwind && result instanceof Set<?>) {
Object currentValue = frame.get(outputPosition);
return ((Set<?>)result).contains(currentValue);
}
} catch (Exception e) {
context.getLogger().warn("Error while evaluating expression", e);
}
return false;
}
@Override
public ISearchOperation getOperation() {
return ExpressionEvalCheck.this;
}
}
private final int outputPosition;
private final IExpressionEvaluator evaluator;
private final Map<String, Integer> nameMap;
private final boolean unwind;
public ExpressionEvalCheck(IExpressionEvaluator evaluator, Map<String, Integer> nameMap, int position) {
this(evaluator, nameMap, false, position);
}
/**
* @since 2.7
*/
public ExpressionEvalCheck(IExpressionEvaluator evaluator, Map<String, Integer> nameMap, boolean unwind, int position) {
this.evaluator = evaluator;
this.nameMap = nameMap;
this.unwind = unwind;
this.outputPosition = position;
}
@Override
public ISearchOperationExecutor createExecutor() {
return new Executor();
}
@Override
public List<Integer> getVariablePositions() {
// XXX not sure if this is the correct implementation to get the affected variable indicies
return new ArrayList<>(nameMap.values());
}
@Override
public String toString() {
return toString(Object::toString);
}
@Override
public String toString(Function<Integer, String> variableMapping) {
return "check "+variableMapping.apply(outputPosition)+" = expression "+evaluator.getShortDescription();
}
}
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