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a Java JDBC driver for reading comma-separated-value files

There is a newer version: 1.0.46

/*
 *  CsvJdbc - a JDBC driver for CSV files
 *  Copyright (C) 2008  Mario Frasca
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.relique.jdbc.csv;

import java.sql.SQLException;
import java.util.Map;

class SQLAvgFunction extends SQLSumFunction
{
	public SQLAvgFunction(boolean isDistinct, Expression expression)
	{
		super(isDistinct, expression);
	}
	@Override
	public Object eval(Map env) throws SQLException
	{
		Object o = super.eval(env);
		if (o != null)
		{
			double average = ((Number)o).doubleValue() / counter;
			o = Double.valueOf(average);
		}
		return o;
	}
	@Override
	public String toString()
	{
		StringBuilder sb = new StringBuilder("AVG(");
		if (distinctValues != null)
			sb.append("DISTINCT ");
		sb.append(expression);
		sb.append(")");
		return sb.toString();
	}
}