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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
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*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
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package org.apache.cayenne.access.jdbc.reader;
import java.sql.ResultSet;
import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.access.jdbc.RowDescriptor;
import org.apache.cayenne.access.types.ExtendedType;
import org.apache.cayenne.query.ScalarResultSegment;
import org.apache.cayenne.util.Util;
/**
* @since 3.0
*/
class ScalarRowReader<T> implements RowReader<T> {
private ExtendedType converter;
private int index;
private int type;
ScalarRowReader(RowDescriptor descriptor, ScalarResultSegment segmentMetadata) {
int scalarIndex = segmentMetadata.getColumnOffset();
this.converter = descriptor.getConverters()[scalarIndex];
this.type = descriptor.getColumns()[scalarIndex].getJdbcType();
this.index = scalarIndex + 1;
}
@Override
@SuppressWarnings("unchecked")
public T readRow(ResultSet resultSet) {
try {
return (T) converter.materializeObject(resultSet, index, type);
} catch (CayenneRuntimeException cex) {
// rethrow unmodified
throw cex;
} catch (Exception otherex) {
throw new CayenneRuntimeException("Exception materializing column.", Util.unwindException(otherex));
}
}
}