/* ===========================================================

 * JFreeChart : a free chart library for the Java(tm) platform

 * ===========================================================

 *

 * (C) Copyright 2000-2004, by Object Refinery Limited and Contributors.

 *

 * Project Info:  http://www.jfree.org/jfreechart/index.html

 *

 * 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., 59 Temple Place, Suite 330,

 * Boston, MA 02111-1307, USA.

 *

 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 

 * in the United States and other countries.]

 *

 * --------------

 * RangeInfo.java

 * --------------

 * (C) Copyright 2000-2004, by Object Refinery Limited.

 *

 * Original Author:  David Gilbert (for Object Refinery Limited);

 * Contributor(s):   -;

 *

 * $Id: RangeInfo.java,v 1.1 2004/08/31 15:21:49 mungady Exp $

 *

 * Changes (from 18-Sep-2001)

 * --------------------------

 * 18-Sep-2001 : Added standard header and fixed DOS encoding problem (DG);

 * 15-Nov-2001 : Moved to package com.jrefinery.data.* (DG);

 *               Updated Javadoc comments (DG);

 * 22-Apr-2002 : Added getValueRange() method (DG);

 *

 */



package org.jfree.data;





/**

 * An interface (optional) that can be implemented by a dataset to assist in determining the

 * minimum and maximum values.

 */

public interface RangeInfo {



    /**

     * Returns the minimum value in the dataset's range (or null if all the

     * values in the range are null).

     *

     * @return The minimum value.

     */

    public Number getMinimumRangeValue();



    /**

     * Returns the maximum value in the dataset's range (or null if all the

     * values in the range are null).

     *

     * @return The maximum value.

     */

    public Number getMaximumRangeValue();



    /**

     * Returns the range of the values in this dataset's range.

     *

     * @return The range.

     */

    public Range getValueRange();



}

