missingvalue.java

为了下东西 随便发了个 datamining 的源代码

/*
 *    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.
 */

/*
 * Created on 2005/3/30
 *
 * $Author$
 * $Date$
 * $Revision$
 *
 */
package eti.bi.common.data;

import java.awt.Color;

/**
 * @author kelvinj
 *
 */
public abstract class MissingValue {

	public final static String DISPLAY_VALUE = "[MISSING]";
	public final static Color DISPLAY_COLOR = Color.RED;
	
	/**
	 * Default Constructor
	 */
	public MissingValue() {
		super();
		// TODO Auto-generated constructor stub
	}
	
	/**
	 * To determine if the value object is missing value.
	 * Supported object types and checking are:
	 * 1. Double, returns true if it is Double.NaN
	 * 
	 * Others returns false.
	 **/
	public static boolean isMissingValue(Object a_Value)
	{
		//Check if a_Value is Double.NaN
		if (a_Value==null)
		{
			return true;
		}else if(a_Value instanceof Double)
		{
			return Double.isNaN(((Double)a_Value).doubleValue());
		}
		
		return false;
	}
}