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.]
   *
   * --------------------------
   * CategorySeriesHandler.java
   * --------------------------
   * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes
   * -------
   * 23-Jan-2003 : Version 1 (DG);
   *
   */
  
  package org.jfree.data.xml;
  
  import java.util.Iterator;
  
  import org.jfree.data.DefaultKeyedValues;
  import org.xml.sax.Attributes;
  import org.xml.sax.SAXException;
  import org.xml.sax.helpers.DefaultHandler;
  
  /**
   * A handler for reading a series for a category dataset.
   */
  public class CategorySeriesHandler extends DefaultHandler
          implements DatasetTags {
  
      /** The root handler. */
      private RootHandler root;
  
      /** The series key. */
      private Comparable seriesKey;
  
      /** The values. */
      private DefaultKeyedValues values;
  
      /**
       * Creates a new item handler.
       *
       * @param root  the root handler.
       */
      public CategorySeriesHandler(RootHandler root) {
          this.root = root;
          this.values = new DefaultKeyedValues();
      }
  
      /**
       * Sets the series key.
       *
       * @param key  the key.
       */
      public void setSeriesKey(Comparable key) {
          this.seriesKey = key;
      }
  
      /**
       * Adds an item to the temporary storage for the series.
       *
       * @param key  the key.
       * @param value  the value.
       */
      public void addItem(Comparable key, final Number value) {
          this.values.addValue(key, value);
      }
  
      /**
       * The start of an element.
       *
       * @param namespaceURI  the namespace.
       * @param localName  the element name.
       * @param qName  the element name.
       * @param atts  the attributes.
       *
       * @throws SAXException for errors.
       */
      public void startElement(String namespaceURI,
                               String localName,
                               String qName,
                               Attributes atts) throws SAXException {
  
          if (qName.equals(SERIES_TAG)) {
              setSeriesKey(atts.getValue("name"));
              ItemHandler subhandler = new ItemHandler(this.root, this);
              this.root.pushSubHandler(subhandler);
          }
          else if (qName.equals(ITEM_TAG)) {
              ItemHandler subhandler = new ItemHandler(this.root, this);
              this.root.pushSubHandler(subhandler);
              subhandler.startElement(namespaceURI, localName, qName, atts);
          }
  
          else {
              throw new SAXException(
                  "Expecting <Series> or <Item> tag...found " + qName
              );
          }
      }
  
      /**
       * The end of an element.
       *
       * @param namespaceURI  the namespace.
       * @param localName  the element name.
       * @param qName  the element name.
       */
      public void endElement(String namespaceURI,
                             String localName,
                             String qName) {
  
          if (this.root instanceof CategoryDatasetHandler) {
              CategoryDatasetHandler handler = (CategoryDatasetHandler) this.root;
  
              Iterator iterator = this.values.getKeys().iterator();
              while (iterator.hasNext()) {
                  Comparable key = (Comparable) iterator.next();
                  Number value = this.values.getValue(key);
                  handler.addItem(this.seriesKey, key, value);
              }
  
              this.root.popSubHandler();
          }
  
      }
  
  }
  