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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 org.eclipse.viatra.query.runtime.matchers.tuple.ITuple;
import tools.refinery.store.map.Cursor;
import tools.refinery.store.tuple.Tuple;
import java.util.Iterator;
/**
* Cursor for a functional result set that iterates over a stream of raw matches and doesn't check whether the
* functional dependency of the output on the inputs is obeyed.
* @param <T> The output type.
*/
class UnsafeFunctionalCursor<T> implements Cursor<Tuple, T> {
private final Iterator<? extends ITuple> tuplesIterator;
private boolean terminated;
private Tuple key;
private T value;
public UnsafeFunctionalCursor(Iterator<? extends ITuple> tuplesIterator) {
this.tuplesIterator = tuplesIterator;
}
@Override
public Tuple getKey() {
return key;
}
@Override
public T getValue() {
return value;
}
@Override
public boolean isTerminated() {
return terminated;
}
@Override
public boolean move() {
if (!terminated && tuplesIterator.hasNext()) {
var match = tuplesIterator.next();
key = MatcherUtils.keyToRefineryTuple(match);
@SuppressWarnings("unchecked")
var typedValue = (T) match.get(match.getSize() - 1);
value = typedValue;
return true;
}
terminated = true;
return false;
}
}
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