package hirondelle.web4j.database;

import java.sql.ResultSet;

import java.sql.SQLException;

import hirondelle.web4j.BuildImpl;

/**

 Construct a building block object from the <em>first</em> column of a <tt>ResultSet</tt>. 

 <P>This implementation violates the rule that all columns must be used to construct the 

 target object.

*/

final class ValueFromRow<E> extends ModelBuilder<E>{

  ValueFromRow(Class<E> aSupportedTargetClass){

    fClass = aSupportedTargetClass;  

  }

  E build(ResultSet aRow) throws SQLException {

    return fColumnToObject.convert(aRow, FIRST_COLUMN, fClass);

  }

  // PRIVATE //

  private final Class<E> fClass;

  /** Translates column values into desired objects. */

  private ConvertColumn fColumnToObject = BuildImpl.forConvertColumn();

  private static final int FIRST_COLUMN = 1;

}