content: /* ========================================================================
   * JCommon : a free general purpose class library for the Java(tm) platform
   * ========================================================================
   *
   * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
   * 
   * Project Info:  http://www.jfree.org/jcommon/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.]
   * 
   * --------------------
   * ListReadHandler.java
   * --------------------
   * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
   *
   * Original Author:  Thomas Morgner;
   * Contributor(s):   David Gilbert (for Object Refinery Limited);
   *
   * $Id: ListReadHandler.java,v 1.3 2005/10/18 13:33:32 mungady Exp $
   *
   * Changes
   * -------
   * 12-Nov-2003 : Initial version (TM);
   *  
   */
  
  package org.jfree.xml.parser.coretypes;
  
  import java.util.ArrayList;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Stack;
  import java.util.Vector;
  
  import org.jfree.xml.parser.AbstractXmlReadHandler;
  import org.jfree.xml.parser.XmlReadHandler;
  import org.jfree.xml.parser.XmlReaderException;
  import org.xml.sax.Attributes;
  import org.xml.sax.SAXException;
  
  /**
   * A SAX handler for reading a list from an XML element.
   */
  public class ListReadHandler extends AbstractXmlReadHandler {
  
      /** The list under construction. */
      private List retval;
      
      /** The handlers. */
      private ArrayList handlers;
      
      /** The type of list ('array-list', 'linked-list', 'stack', 'vector'). */
      private String listType;
  
      /**
       * Default constructor.
       */
      public ListReadHandler() {
          super();
      }
  
      /**
       * Start parsing.
       * 
       * @param attrs  the attributes.
       * 
       * @throws SAXException if there is a parsing error.
       */
      protected void startParsing(final Attributes attrs) throws SAXException {
          this.listType = attrs.getValue("type");
          if (this.listType == null) {
              this.listType = "array-list";
          }
          this.handlers = new ArrayList();
      }
  
      /**
       * Gets a handler for a child.
       * 
       * @param tagName  the tag name.
       * @param atts  the attributes.
       * 
       * @return A handler.
       * 
       * @throws XmlReaderException if there is a problem with the reader.
       * @throws SAXException if there is a parsing error.
       */
      protected XmlReadHandler getHandlerForChild(final String tagName, final Attributes atts)
          throws XmlReaderException, SAXException {
          final XmlReadHandler handler = getRootHandler().createHandler(Object.class, tagName, atts);
          this.handlers.add(handler);
          return handler;
      }
  
      /**
       * Parsing is finished.
       * 
       * @throws SAXException if there is a parsing error.
       * @throws XmlReaderException if there is a problem with the reader.
       * 
       */
      protected void doneParsing() throws SAXException, XmlReaderException {
          final XmlReadHandler[] handler = (XmlReadHandler[])
          this.handlers.toArray(new XmlReadHandler[this.handlers.size()]);
          this.retval = createList(handler.length);
          for (int i = 0; i < handler.length; i++) {
              this.retval.add(handler[i].getObject());
          }
          this.handlers.clear();
      }
  
      /**
       * Creates a list.
       * 
       * @param initialSize  the initial size.
       * 
       * @return A new list.
       */
      private List createList(final int initialSize) {
          if (this.listType.equals("stack")) {
              return new Stack();
          }
          if (this.listType.equals("linked-list")) {
              return new LinkedList();
          }
          if (this.listType.equals("vector")) {
              return new Vector(initialSize);
          }
          return new ArrayList(initialSize);
      }
  
      /**
       * Returns the object under construction.
       * 
       * @return The list.
       */
      public Object getObject() {
          return this.retval;
      }
      
  }
  