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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.interpreter.internal.matcher;
import tools.refinery.interpreter.matchers.context.IQueryRuntimeContext;
import tools.refinery.interpreter.matchers.tuple.TupleMask;
import tools.refinery.interpreter.matchers.tuple.Tuples;
import tools.refinery.interpreter.rete.index.Indexer;
import tools.refinery.interpreter.rete.matcher.RetePatternMatcher;
import tools.refinery.store.map.Cursor;
import tools.refinery.store.map.Cursors;
import tools.refinery.logic.dnf.RelationalQuery;
import tools.refinery.store.query.interpreter.internal.QueryInterpreterAdapterImpl;
import tools.refinery.store.tuple.Tuple;
/**
* Directly access the tuples inside a Refinery Interpreter pattern matcher.<p>
* This class neglects calling
* {@link IQueryRuntimeContext#wrapTuple(tools.refinery.interpreter.matchers.tuple.Tuple)}
* and
* {@link IQueryRuntimeContext#unwrapTuple(tools.refinery.interpreter.matchers.tuple.Tuple)},
* because {@link tools.refinery.store.query.interpreter.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 InterpretedRelationalMatcher extends AbstractInterpretedMatcher<Boolean> {
private final TupleMask emptyMask;
private final TupleMask identityMask;
private final Indexer emptyMaskIndexer;
public InterpretedRelationalMatcher(QueryInterpreterAdapterImpl adapter, RelationalQuery query,
RawPatternMatcher rawPatternMatcher) {
super(adapter, query, rawPatternMatcher);
int arity = query.arity();
emptyMask = TupleMask.empty(arity);
identityMask = TupleMask.identity(arity);
if (backend instanceof RetePatternMatcher reteBackend) {
emptyMaskIndexer = reteBackend.getInternalIndexer(emptyMask);
} else {
emptyMaskIndexer = null;
}
}
@Override
public Boolean get(Tuple parameters) {
var tuple = MatcherUtils.toViatraTuple(parameters);
if (emptyMaskIndexer == null) {
return backend.hasMatch(identityMask, tuple);
}
var matches = emptyMaskIndexer.get(Tuples.staticArityFlatTupleOf());
return matches != null && matches.contains(tuple);
}
@Override
public Cursor<Tuple, Boolean> getAll() {
if (emptyMaskIndexer == null) {
var allMatches = backend.getAllMatches(emptyMask, Tuples.staticArityFlatTupleOf());
return new RelationalCursor(allMatches.iterator());
}
var matches = emptyMaskIndexer.get(Tuples.staticArityFlatTupleOf());
return matches == null ? Cursors.empty() : new RelationalCursor(matches.stream().iterator());
}
@Override
public int size() {
if (emptyMaskIndexer == null) {
return backend.countMatches(emptyMask, Tuples.staticArityFlatTupleOf());
}
var matches = emptyMaskIndexer.get(Tuples.staticArityFlatTupleOf());
return matches == null ? 0 : matches.size();
}
@Override
public void update(tools.refinery.interpreter.matchers.tuple.Tuple updateElement, boolean isInsertion) {
var key = MatcherUtils.toRefineryTuple(updateElement);
notifyChange(key, !isInsertion, isInsertion);
}
}
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