/* ========================================================================
* 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;
}
}