gt:             this.maximumRangeValue = new Double(mean + standardDeviation);
context: /* ===========================================================
   * 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.]
   *
   * --------------------------------------
   * DefaultStatisticalCategoryDataset.java
   * --------------------------------------
   * (C) Copyright 2002, 2003, by Pascal Collet.
   *
   * Original Author:  Pascal Collet;
   * Contributor(s):   David Gilbert (for Object Refinery Limited);
   *
   * $Id: DefaultStatisticalCategoryDataset.java,v 1.1 2004/08/31 15:32:24 mungady Exp $
   *
   * Changes
   * -------
   * 21-Aug-2002 : Version 1, contributed by Pascal Collet (DG);
   * 07-Oct-2002 : Fixed errors reported by Checkstyle (DG);
   * 05-Feb-2003 : Revised implementation to use KeyedObjects2D (DG);
   * 28-Aug-2003 : Moved from org.jfree.data --> org.jfree.data.statistics (DG);
   * 06-Oct-2003 : Removed incorrect Javadoc text (DG);
   *
   */
  
  package org.jfree.data.statistics;
  
  import java.util.List;
  
  import org.jfree.data.KeyedObjects2D;
  import org.jfree.data.Range;
  import org.jfree.data.RangeInfo;
  import org.jfree.data.general.AbstractDataset;
  
  /**
   * A convenience class that provides a default implementation of the
   * {@link StatisticalCategoryDataset} interface.
   *
   * @author Pascal Collet
   */
  public class DefaultStatisticalCategoryDataset extends AbstractDataset
                                                 implements StatisticalCategoryDataset,
                                                            RangeInfo {
  
      /** Storage for the data. */
      private KeyedObjects2D data;
  
      /** The minimum range value. */
      private Number minimumRangeValue;
  
      /** The maximum range value. */
      private Number maximumRangeValue;
  
      /** The range of values. */
      private Range valueRange;
  
      /**
       * Creates a new dataset.
       */
      public DefaultStatisticalCategoryDataset() {
  
          this.data = new KeyedObjects2D();
          this.minimumRangeValue = new Double(0.0);
          this.maximumRangeValue = new Double(0.0);
          this.valueRange = new Range(0.0, 0.0);
  
      }
  
      /**
       * Returns the mean value for an item.
       *
       * @param row  the row index (zero-based).
       * @param column  the column index (zero-based).
       *
       * @return the mean value.
       */
      public Number getMeanValue (final int row, final int column) {
  
          Number result = null;
          final MeanAndStandardDeviation masd 
              = (MeanAndStandardDeviation) this.data.getObject(row, column);
          if (masd != null) {
              result = masd.getMean();
          }
          return result;
  
      }
  
      /**
       * Returns the value for an item.
       *
       * @param row  the row index.
       * @param column  the column index.
       *
       * @return the value.
       */
      public Number getValue (final int row, final int column) {
          return getMeanValue(row, column);
      }
  
      /**
       * Returns the value for an item.
       *
       * @param rowKey  the row key.
       * @param columnKey  the columnKey.
       *
       * @return the value.
       */
      public Number getValue (final Comparable rowKey, final Comparable columnKey) {
          return getMeanValue(rowKey, columnKey);
      }
  
      /**
       * Returns the mean value for an item.
       *
       * @param rowKey  the row key.
       * @param columnKey  the columnKey.
       *
       * @return the mean value.
       */
      public Number getMeanValue (final Comparable rowKey, final Comparable columnKey) {
  
          Number result = null;
          final MeanAndStandardDeviation masd
              = (MeanAndStandardDeviation) this.data.getObject(rowKey, columnKey);
          if (masd != null) {
              result = masd.getMean();
          }
          return result;
  
      }
  
      /**
       * Returns the standard deviation value for an item.
       *
       * @param row  the row index (zero-based).
       * @param column  the column index (zero-based).
       *
       * @return the standard deviation.
       */
      public Number getStdDevValue (final int row, final int column) {
  
          Number result = null;
          final MeanAndStandardDeviation masd 
              = (MeanAndStandardDeviation) this.data.getObject(row, column);
          if (masd != null) {
              result = masd.getStandardDeviation();
          }
          return result;
  
      }
  
      /**
       * Returns the standard deviation value for an item.
       *
       * @param rowKey  the row key.
       * @param columnKey  the columnKey.
       *
       * @return the standard deviation.
       */
      public Number getStdDevValue (final Comparable rowKey, final Comparable columnKey) {
  
          Number result = null;
          final MeanAndStandardDeviation masd
              = (MeanAndStandardDeviation) this.data.getObject(rowKey, columnKey);
          if (masd != null) {
              result = masd.getStandardDeviation();
          }
          return result;
  
      }
  
      /**
       * Returns the column index for a given key.
       *
       * @param key  the column key.
       *
       * @return the column index.
       */
      public int getColumnIndex(final Comparable key) {
          return this.data.getColumnIndex(key);
      }
  
      /**
       * Returns a column key.
       *
       * @param column  the column index (zero-based).
       *
       * @return the column key.
       */
      public Comparable getColumnKey(final int column) {
          return this.data.getColumnKey(column);
      }
  
      /**
       * Returns the column keys.
       *
       * @return the keys.
       */
      public List getColumnKeys() {
          return this.data.getColumnKeys();
      }
  
      /**
       * Returns the row index for a given key.
       *
       * @param key  the row key.
       *
       * @return the row index.
       */
      public int getRowIndex(final Comparable key) {
          return this.data.getRowIndex(key);
      }
  
      /**
       * Returns a row key.
       *
       * @param row  the row index (zero-based).
       *
       * @return the row key.
       */
      public Comparable getRowKey(final int row) {
          return this.data.getRowKey(row);
      }
  
      /**
       * Returns the row keys.
       *
       * @return the keys.
       */
      public List getRowKeys() {
          return this.data.getRowKeys();
      }
  
      /**
       * Returns the number of rows in the table.
       *
       * @return the row count.
       */
      public int getRowCount() {
          return this.data.getRowCount();
      }
  
      /**
       * Returns the number of columns in the table.
       *
       * @return the column count.
       */
      public int getColumnCount() {
          return this.data.getColumnCount();
      }
  
      /**
       * Adds a mean and standard deviation to the table.
       *
       * @param mean  the mean.
       * @param standardDeviation  the standard deviation.
       * @param rowKey  the row key.
       * @param columnKey  the column key.
       */
      public void add(final double mean, final double standardDeviation,
                      final Comparable rowKey, final Comparable columnKey) {
  
          final MeanAndStandardDeviation item = new MeanAndStandardDeviation(new Double(mean),
                                                                       new Double(standardDeviation));
  
          this.data.addObject(item, rowKey, columnKey);
          if ((mean + standardDeviation) > this.maximumRangeValue.doubleValue()) {
  