numericcolumn.java

一个数据挖掘软件ALPHAMINERR的整个过程的JAVA版源代码

/*
 *    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 2 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, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

 /**
  * Title: XELOPES Data Mining Library
  * Description: The XELOPES library is an open platform-independent and data-source-independent library for Embedded Data Mining.
  * Copyright: Copyright (c) 2002 Prudential Systems Software GmbH
  * Company: ZSoft (www.zsoft.ru), Prudsys (www.prudsys.com)
  * @author Valentine Stepanenko ([e-mail])
  * @version 1.0
  */

package com.prudsys.pdm.Input.Relational;

/**
 * Description of numeric column.
 */
public class NumericColumn extends ColumnInfo
{
  private int precision;
  private double defaultValue;

  /**
   * Constructor which obtains the data from a given result set.
   *
   * @param rs result set of the column
   * @throws java.sql.SQLException wrong result set
   */
  NumericColumn(java.sql.ResultSet rs) throws java.sql.SQLException {

    super(rs);
    precision = rs.getInt("COLUMN_SIZE");
    String def = rs.getString("COLUMN_DEF");
    if(def != null) {
      try
      {
        defaultValue = Double.parseDouble(def);
      }
      catch (NumberFormatException ex)
      {
        defaultValue = Double.NaN;
      }
    }
    else defaultValue = Double.NaN;
  }

  /**
   * Returns precision of the column entries.
   *
   * @return precision of the column entries
   */
  public int getPrecision() {
    return precision;
  }

  /**
   * Returns default value of the column entries.
   *
   * @return default value of column entries
   */
  public double getDefaultValue() {
    return defaultValue;
  }
}