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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.extend;
import java.util.Iterator;
import java.util.List;
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.ExtendOperationExecutor;
import tools.refinery.viatra.runtime.localsearch.operations.IPatternMatcherOperation;
import tools.refinery.viatra.runtime.localsearch.operations.ISearchOperation;
import tools.refinery.viatra.runtime.localsearch.operations.util.CallInformation;
import tools.refinery.viatra.runtime.matchers.backend.IQueryResultProvider;
import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
import tools.refinery.viatra.runtime.matchers.tuple.TupleMask;
import tools.refinery.viatra.runtime.matchers.tuple.VolatileModifiableMaskedTuple;
/**
* @author Grill Balázs
* @since 1.4
*
*/
public class ExtendPositivePatternCall implements ISearchOperation, IPatternMatcherOperation {
private class Executor extends ExtendOperationExecutor<Tuple> {
private final VolatileModifiableMaskedTuple maskedTuple;
public Executor() {
maskedTuple = new VolatileModifiableMaskedTuple(information.getThinFrameMask());
}
@Override
protected Iterator<? extends Tuple> getIterator(MatchingFrame frame, ISearchContext context) {
maskedTuple.updateTuple(frame);
IQueryResultProvider matcher = context.getMatcher(information.getCallWithAdornment());
return matcher.getAllMatches(information.getParameterMask(), maskedTuple).iterator();
}
/**
* @since 2.0
*/
@Override
protected boolean fillInValue(Tuple result, MatchingFrame frame, ISearchContext context) {
TupleMask mask = information.getFullFrameMask();
// The first loop clears out the elements from a possible previous iteration
for(int i : information.getFreeParameterIndices()) {
mask.set(frame, i, null);
}
for(int i : information.getFreeParameterIndices()) {
Object oldValue = mask.getValue(frame, i);
Object valueToFill = result.get(i);
if (oldValue != null && !oldValue.equals(valueToFill)){
// If the inverse map contains more than one values for the same key, it means that these arguments are unified by the caller.
// In this case if the callee assigns different values the frame shall be dropped
return false;
}
mask.set(frame, i, valueToFill);
}
return true;
}
@Override
protected void cleanup(MatchingFrame frame, ISearchContext context) {
TupleMask mask = information.getFullFrameMask();
for(int i : information.getFreeParameterIndices()){
mask.set(frame, i, null);
}
}
@Override
public ISearchOperation getOperation() {
return ExtendPositivePatternCall.this;
}
}
private final CallInformation information;
/**
* @since 1.7
*/
public ExtendPositivePatternCall(CallInformation information) {
this.information = information;
}
@Override
public ISearchOperationExecutor createExecutor() {
return new Executor();
}
@Override
public List<Integer> getVariablePositions() {
return information.getVariablePositions();
}
@Override
public String toString() {
return toString(Object::toString);
}
@Override
public String toString(Function<Integer, String> variableMapping) {
return "extend find " + information.toString(variableMapping);
}
@Override
public CallInformation getCallInformation() {
return information;
}
}
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