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/*
* SPDX-FileCopyrightText: 2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.store.query.resultset;
import tools.refinery.store.query.ModelQueryAdapter;
import tools.refinery.store.query.dnf.Query;
import tools.refinery.store.tuple.Tuple;
import java.util.ArrayList;
import java.util.List;
public abstract class AbstractResultSet<T> implements ResultSet<T> {
private final ModelQueryAdapter adapter;
private final Query<T> query;
private final List<ResultSetListener<T>> listeners = new ArrayList<>();
protected AbstractResultSet(ModelQueryAdapter adapter, Query<T> query) {
this.adapter = adapter;
this.query = query;
}
@Override
public ModelQueryAdapter getAdapter() {
return adapter;
}
@Override
public Query<T> getQuery() {
return query;
}
@Override
public void addListener(ResultSetListener<T> listener) {
if (listeners.isEmpty()) {
startListeningForChanges();
}
listeners.add(listener);
}
@Override
public void removeListener(ResultSetListener<T> listener) {
listeners.remove(listener);
if (listeners.isEmpty()) {
stopListeningForChanges();
}
}
protected abstract void startListeningForChanges();
protected abstract void stopListeningForChanges();
protected void notifyChange(Tuple key, T oldValue, T newValue) {
int listenerCount = listeners.size();
// Use a for loop instead of a for-each loop to avoid {@code Iterator} allocation overhead.
//noinspection ForLoopReplaceableByForEach
for (int i = 0; i < listenerCount; i++) {
listeners.get(i).put(key, oldValue, newValue);
}
}
}
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