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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 final ExtendedType<T> converter;
      private final int index;
      private final int type;
  
      @SuppressWarnings("unchecked")
      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
      public T readRow(ResultSet resultSet) {
          try {
              return converter.materializeObject(resultSet, index, type);
          } catch (CayenneRuntimeException cex) {
              // rethrow unmodified
              throw cex;
          } catch (Exception otherex) {
              throw new CayenneRuntimeException("Exception materializing column.", Util.unwindException(otherex));
          }
      }
  }
  