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ResultSetIterator.java
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ResultSetIterator.java
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/**
* Copyright (C) 2022 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.ontodriver.iteration;
import cz.cvut.kbss.ontodriver.ResultSet;
import cz.cvut.kbss.ontodriver.exception.OntoDriverException;
import cz.cvut.kbss.ontodriver.exception.OntoDriverRuntimeException;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* Iterator over a {@link ResultSet}.
* <p>
* Note that the methods wrap {@link OntoDriverException}s possibly thrown by the underlying result set in a {@link OntoDriverRuntimeException}
* in order to support the {@link Iterator} API.
*/
public class ResultSetIterator implements Iterator<ResultRow> {
private final ResultSet resultSet;
public ResultSetIterator(ResultSet resultSet) {
this.resultSet = resultSet;
}
@Override
public boolean hasNext() {
try {
return resultSet.hasNext();
} catch (OntoDriverException e) {
throw new ResultSetIterationException(e);
}
}
@Override
public ResultRow next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
try {
resultSet.next();
return new DelegatingResultRow(resultSet);
} catch (OntoDriverException e) {
throw new ResultSetIterationException(e);
}
}
}