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/*
* SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.store.query.viatra.internal.matcher;
import tools.refinery.viatra.runtime.matchers.tuple.TupleMask;
import tools.refinery.viatra.runtime.matchers.tuple.Tuples;
import tools.refinery.viatra.runtime.rete.index.IterableIndexer;
import tools.refinery.viatra.runtime.rete.matcher.RetePatternMatcher;
import tools.refinery.store.map.Cursor;
import tools.refinery.store.query.dnf.FunctionalQuery;
import tools.refinery.store.query.viatra.internal.ViatraModelQueryAdapterImpl;
import tools.refinery.store.tuple.Tuple;
/**
* Directly access the tuples inside a VIATRA pattern matcher.<p>
* This class neglects calling
* {@link tools.refinery.viatra.runtime.matchers.context.IQueryRuntimeContext#wrapTuple(org.eclipse.viatra.query.runtime.matchers.tuple.Tuple)}
* and
* {@link tools.refinery.viatra.runtime.matchers.context.IQueryRuntimeContext#unwrapTuple(org.eclipse.viatra.query.runtime.matchers.tuple.Tuple)},
* because {@link tools.refinery.store.query.viatra.internal.context.RelationalRuntimeContext} provides a trivial
* implementation for these methods.
* Using this class with any other runtime context may lead to undefined behavior.
*/
public class FunctionalViatraMatcher<T> extends AbstractViatraMatcher<T> {
private final TupleMask emptyMask;
private final TupleMask omitOutputMask;
private final IterableIndexer omitOutputIndexer;
public FunctionalViatraMatcher(ViatraModelQueryAdapterImpl adapter, FunctionalQuery<T> query,
RawPatternMatcher rawPatternMatcher) {
super(adapter, query, rawPatternMatcher);
int arity = query.arity();
int arityWithOutput = arity + 1;
emptyMask = TupleMask.empty(arityWithOutput);
omitOutputMask = TupleMask.omit(arity, arityWithOutput);
if (backend instanceof RetePatternMatcher reteBackend) {
var maybeIterableOmitOutputIndexer = reteBackend.getInternalIndexer(omitOutputMask);
if (maybeIterableOmitOutputIndexer instanceof IterableIndexer iterableOmitOutputIndexer) {
omitOutputIndexer = iterableOmitOutputIndexer;
} else {
omitOutputIndexer = null;
}
} else {
omitOutputIndexer = null;
}
}
@Override
public T get(Tuple parameters) {
var tuple = MatcherUtils.toViatraTuple(parameters);
if (omitOutputIndexer == null) {
return MatcherUtils.getSingleValue(backend.getAllMatches(omitOutputMask, tuple).iterator());
} else {
return MatcherUtils.getSingleValue(omitOutputIndexer.get(tuple));
}
}
@Override
public Cursor<Tuple, T> getAll() {
if (omitOutputIndexer == null) {
var allMatches = backend.getAllMatches(emptyMask, Tuples.staticArityFlatTupleOf());
return new UnsafeFunctionalCursor<>(allMatches.iterator());
}
return new FunctionalCursor<>(omitOutputIndexer);
}
@Override
public int size() {
if (omitOutputIndexer == null) {
return backend.countMatches(emptyMask, Tuples.staticArityFlatTupleOf());
}
return omitOutputIndexer.getBucketCount();
}
@Override
public void update(tools.refinery.viatra.runtime.matchers.tuple.Tuple updateElement, boolean isInsertion) {
var key = MatcherUtils.keyToRefineryTuple(updateElement);
var value = MatcherUtils.<T>getValue(updateElement);
if (isInsertion) {
notifyChange(key, null, value);
} else {
notifyChange(key, value, null);
}
}
}
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