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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.update;
import org.eclipse.viatra.query.runtime.matchers.context.IInputKey;
import org.eclipse.viatra.query.runtime.matchers.context.IQueryRuntimeContextListener;
import org.eclipse.viatra.query.runtime.matchers.tuple.ITuple;
import org.eclipse.viatra.query.runtime.matchers.tuple.Tuple;
import tools.refinery.store.model.Interpretation;
import tools.refinery.store.model.InterpretationListener;
import tools.refinery.store.query.viatra.internal.ViatraModelQueryAdapterImpl;
import tools.refinery.store.query.view.SymbolView;
import tools.refinery.store.query.view.TuplePreservingView;
import java.util.ArrayList;
import java.util.List;
public abstract class SymbolViewUpdateListener<T> implements InterpretationListener<T> {
private final ViatraModelQueryAdapterImpl adapter;
private final Interpretation<T> interpretation;
private final List<RelationViewFilter> filters = new ArrayList<>();
protected SymbolViewUpdateListener(ViatraModelQueryAdapterImpl adapter, Interpretation<T> interpretation) {
this.adapter = adapter;
this.interpretation = interpretation;
}
public void addFilter(IInputKey inputKey, ITuple seed, IQueryRuntimeContextListener listener) {
if (filters.isEmpty()) {
// First filter to be added, from now on we have to subscribe to model updates.
interpretation.addListener(this, true);
}
filters.add(new RelationViewFilter(inputKey, seed, listener));
}
public void removeFilter(IInputKey inputKey, ITuple seed, IQueryRuntimeContextListener listener) {
if (filters.remove(new RelationViewFilter(inputKey, seed, listener)) && filters.isEmpty()) {
// Last listener to be added, we don't have be subscribed to model updates anymore.
interpretation.removeListener(this);
}
}
protected void processUpdate(Tuple tuple, boolean isInsertion) {
adapter.markAsPending();
int size = filters.size();
// Use a for loop instead of a for-each loop to avoid <code>Iterator</code> allocation overhead.
//noinspection ForLoopReplaceableByForEach
for (int i = 0; i < size; i++) {
filters.get(i).update(tuple, isInsertion);
}
}
public static <T> SymbolViewUpdateListener<T> of(ViatraModelQueryAdapterImpl adapter,
SymbolView<T> view,
Interpretation<T> interpretation) {
if (view instanceof TuplePreservingView<T> tuplePreservingRelationView) {
return new TuplePreservingViewUpdateListener<>(adapter, tuplePreservingRelationView,
interpretation);
}
return new TupleChangingViewUpdateListener<>(adapter, view, interpretation);
}
}
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