content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2008, 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
   * in the United States and other countries.]
   *
   * ----------------------
   * IntervalXYDataset.java
   * ----------------------
   * (C) Copyright 2001-2008, by Object Refinery Limited and Contributors.
   *
   * Original Author:  Mark Watson (www.markwatson.com);
   * Contributor(s):   David Gilbert (for Object Refinery Limited);
   *
   * Changes
   * -------
   * 18-Oct-2001 : Version 1, thanks to Mark Watson (DG);
   * 22-Oct-2001 : Renamed DataSource.java --> Dataset.java etc (DG);
   * 06-May-2004 : Added methods that return double primitives (DG);
   *
   */
  
  package org.jfree.data.xy;
  
  /**
   * An extension of the {@link XYDataset} interface that allows a range of data
   * to be defined for the X values, the Y values, or both the X and Y values.
   * This interface is used to support (among other things) bar plots against
   * numerical axes.
   */
  public interface IntervalXYDataset extends XYDataset {
  
      /**
       * Returns the starting X value for the specified series and item.
       *
       * @param series  the series index (zero-based).
       * @param item  the item index (zero-based).
       *
       * @return The value.
       */
      public Number getStartX(int series, int item);
  
      /**
       * Returns the start x-value (as a double primitive) for an item within a
       * series.
       *
       * @param series  the series (zero-based index).
       * @param item  the item (zero-based index).
       *
       * @return The start x-value.
       */
      public double getStartXValue(int series, int item);
  
      /**
       * Returns the ending X value for the specified series and item.
       *
       * @param series  the series index (zero-based).
       * @param item  the item index (zero-based).
       *
       * @return The value.
       */
      public Number getEndX(int series, int item);
  
      /**
       * Returns the end x-value (as a double primitive) for an item within a
       * series.
       *
       * @param series  the series index (zero-based).
       * @param item  the item index (zero-based).
       *
       * @return The end x-value.
       */
      public double getEndXValue(int series, int item);
  
      /**
       * Returns the starting Y value for the specified series and item.
       *
       * @param series  the series index (zero-based).
       * @param item  the item index (zero-based).
       *
       * @return The value.
       */
      public Number getStartY(int series, int item);
  
      /**
       * Returns the start y-value (as a double primitive) for an item within a
       * series.
       *
       * @param series  the series index (zero-based).
       * @param item  the item index (zero-based).
       *
       * @return The start y-value.
       */
      public double getStartYValue(int series, int item);
  
      /**
       * Returns the ending Y value for the specified series and item.
       *
       * @param series  the series index (zero-based).
       * @param item  the item index (zero-based).
       *
       * @return The value.
       */
      public Number getEndY(int series, int item);
  
      /**
       * Returns the end y-value (as a double primitive) for an item within a
       * series.
       *
       * @param series  the series index (zero-based).
       * @param item  the item index (zero-based).
       *
       * @return The end y-value.
       */
      public double getEndYValue(int series, int item);
  
  }
  