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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.context;
import org.eclipse.viatra.query.runtime.matchers.context.*;
import org.eclipse.viatra.query.runtime.matchers.tuple.ITuple;
import org.eclipse.viatra.query.runtime.matchers.tuple.Tuple;
import org.eclipse.viatra.query.runtime.matchers.tuple.TupleMask;
import org.eclipse.viatra.query.runtime.matchers.tuple.Tuples;
import org.eclipse.viatra.query.runtime.matchers.util.Accuracy;
import tools.refinery.store.model.Model;
import tools.refinery.store.query.viatra.internal.ViatraModelQueryAdapterImpl;
import tools.refinery.store.query.viatra.internal.pquery.SymbolViewWrapper;
import tools.refinery.store.query.viatra.internal.update.ModelUpdateListener;
import tools.refinery.store.query.view.AnySymbolView;
import java.lang.reflect.InvocationTargetException;
import java.util.Iterator;
import java.util.Optional;
import java.util.concurrent.Callable;
import static tools.refinery.store.util.CollectionsUtil.filter;
import static tools.refinery.store.util.CollectionsUtil.map;
public class RelationalRuntimeContext implements IQueryRuntimeContext {
private final RelationalQueryMetaContext metaContext;
private final ModelUpdateListener modelUpdateListener;
private final Model model;
RelationalRuntimeContext(ViatraModelQueryAdapterImpl adapter) {
model = adapter.getModel();
metaContext = new RelationalQueryMetaContext(adapter.getStoreAdapter().getInputKeys());
modelUpdateListener = new ModelUpdateListener(adapter);
}
@Override
public IQueryMetaContext getMetaContext() {
return metaContext;
}
@Override
public <V> V coalesceTraversals(Callable<V> callable) throws InvocationTargetException {
try {
return callable.call();
} catch (Exception e) {
throw new InvocationTargetException(e);
}
}
@Override
public boolean isCoalescing() {
return false;
}
@Override
public boolean isIndexed(IInputKey key, IndexingService service) {
if (key instanceof SymbolViewWrapper wrapper) {
var symbolViewKey = wrapper.getWrappedKey();
return this.modelUpdateListener.containsSymbolView(symbolViewKey);
} else {
return false;
}
}
@Override
public void ensureIndexed(IInputKey key, IndexingService service) {
if (!isIndexed(key, service)) {
throw new IllegalStateException("Engine tries to index a new key %s".formatted(key));
}
}
AnySymbolView checkKey(IInputKey key) {
if (key instanceof SymbolViewWrapper wrappedKey) {
var symbolViewKey = wrappedKey.getWrappedKey();
if (modelUpdateListener.containsSymbolView(symbolViewKey)) {
return symbolViewKey;
} else {
throw new IllegalStateException("Query is asking for non-indexed key %s".formatted(symbolViewKey));
}
} else {
throw new IllegalStateException("Query is asking for non-relational key");
}
}
@Override
public int countTuples(IInputKey key, TupleMask seedMask, ITuple seed) {
Iterator<Object[]> iterator = enumerate(key, seedMask, seed).iterator();
int result = 0;
while (iterator.hasNext()) {
iterator.next();
result++;
}
return result;
}
@Override
public Optional<Long> estimateCardinality(IInputKey key, TupleMask groupMask, Accuracy requiredAccuracy) {
return Optional.empty();
}
@Override
public Iterable<Tuple> enumerateTuples(IInputKey key, TupleMask seedMask, ITuple seed) {
var filteredBySeed = enumerate(key, seedMask, seed);
return map(filteredBySeed, Tuples::flatTupleOf);
}
@Override
public Iterable<?> enumerateValues(IInputKey key, TupleMask seedMask, ITuple seed) {
var index = seedMask.getFirstOmittedIndex().orElseThrow(
() -> new IllegalArgumentException("Seed mask does not omit a value"));
var filteredBySeed = enumerate(key, seedMask, seed);
return map(filteredBySeed, array -> array[index]);
}
private Iterable<Object[]> enumerate(IInputKey key, TupleMask seedMask, ITuple seed) {
var relationViewKey = checkKey(key);
Iterable<Object[]> allObjects = relationViewKey.getAll(model);
return filter(allObjects, objectArray -> isMatching(objectArray, seedMask, seed));
}
private static boolean isMatching(Object[] tuple, TupleMask seedMask, ITuple seed) {
for (int i = 0; i < seedMask.indices.length; i++) {
final Object seedElement = seed.get(i);
final Object tupleElement = tuple[seedMask.indices[i]];
if (!tupleElement.equals(seedElement)) {
return false;
}
}
return true;
}
@Override
public boolean containsTuple(IInputKey key, ITuple seed) {
var relationViewKey = checkKey(key);
return relationViewKey.get(model, seed.getElements());
}
@Override
public void addUpdateListener(IInputKey key, Tuple seed, IQueryRuntimeContextListener listener) {
var relationViewKey = checkKey(key);
this.modelUpdateListener.addListener(key, relationViewKey, seed, listener);
}
@Override
public void removeUpdateListener(IInputKey key, Tuple seed, IQueryRuntimeContextListener listener) {
var relationViewKey = checkKey(key);
this.modelUpdateListener.removeListener(key, relationViewKey, seed, listener);
}
@Override
public Object wrapElement(Object externalElement) {
return externalElement;
}
@Override
public Object unwrapElement(Object internalElement) {
return internalElement;
}
@Override
public Tuple wrapTuple(Tuple externalElements) {
return externalElements;
}
@Override
public Tuple unwrapTuple(Tuple internalElements) {
return internalElements;
}
@Override
public void ensureWildcardIndexing(IndexingService service) {
throw new UnsupportedOperationException();
}
@Override
public void executeAfterTraversal(Runnable runnable) {
runnable.run();
}
}
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