jsomhandler.java

Kohonen网络的学习过程可描述为：对于每一个网络的输入

package fi.javasom.jsom;
/**
 * This is the base handler for javasom.
 *
 *  Copyright (C) 2001  Tomi Suuronen
 *
 *  @version 1.0
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;

import fi.javasom.jsom.*;

import java.util.*;

public class JsomHandler extends DefaultHandler
{
	private Hashtable rules = new Hashtable();
	private Stack stack = new Stack();

	private Vector dimensions;
	private double[] doubleCache;
	private String labelCache;
	private String charCache;
	private String nameCache;
	private int indexCache;
	private InputVectors iVector;
	private JsomMap map;

	private boolean data;
	private boolean node;

	/**
	 * Constructor.
	*/
	public JsomHandler()
	{
		super();
		dimensions = new Vector(0,1);
		labelCache = "";
		charCache = "";
		nameCache= "";
		iVector = new InputVectors();
		map = new JsomMap();
		data = false;
		node = false;

		setElementHandler("meta", new MetaHandler());
		setElementHandler("author", new AuthorHandler());
		setElementHandler("project", new ProjectHandler());
		setElementHandler("code", new CodeHandler());
		setElementHandler("name", new NameHandler());
		setElementHandler("organization", new OrganizationHandler());
		setElementHandler("dimension", new DimensionHandler());
		setElementHandler("dim_type", new DimTypeHandler());
		setElementHandler("data", new DataHandler());
		setElementHandler("node", new NodeHandler());
		setElementHandler("dim", new DimHandler());
	}
	/**
   * Define processing for an element type.
  */
	private void setElementHandler(String name, ElementHandler handler)
	{
		rules.put(name, handler);
	}

	/*
	 * Start of an element. Decide what handler to use, and call it.
	*/
	public void startElement(String namespaceURI,String name,String qName,Attributes atts) throws SAXException
	{
		ElementHandler handler = (ElementHandler)rules.get(name);
		stack.push(handler);
		if (handler!=null)
		{
		  handler.startElement(namespaceURI,name,qName,atts);
		}
	}

	/*
	 * End of an element.
	*/
	public void endElement(String uri,String name,String qName) throws SAXException
	{
		ElementHandler handler = (ElementHandler)stack.pop();
		if (handler!=null)
		{
			handler.endElement(uri,name,qName);
		}
	}

	/*
	 * Character data.
	*/
	public void characters(char[] chars,int start,int len) throws SAXException
	{
		ElementHandler handler = (ElementHandler)stack.peek();
		if (handler!=null)
		{
			handler.characters(chars,start,len);
    }
	}

	/*
	 * End of document.
	*/
	public void endDocument() throws SAXException
	{
	}

	/**
	 * Returns input vectors.
	 * @return InputVector - returns the input vectors.
	*/
	public InputVectors getInputVectors()
	{
		return iVector;
	}

	/**
	 * Returns node value count.
	 * @return int - returns dimensionality of a node in this map (this applies to all nodes).
	*/
	public int getNodeValueCount()
	{
		return dimensions.size();
	}

	/**
	 * Returns the JsomMAp object.
	 * @return JsomMap - returns JsomMap object.
	*/
	public JsomMap getJsomMap()
	{
		return map;
	}

	/*********************************************************************************/

	/*
	 * Handles the dimension element events.
	*/
	private class MetaHandler extends ElementHandler
	{
		public void startElement (String namespaceURI,String name,String qName,Attributes atts) throws SAXException
		{
			if(atts.getValue("code")!=null)
			{
				map.setCode(atts.getValue("code"));
			}
			if(atts.getValue("date")!=null)
			{
				map.setDate(atts.getValue("date"));
			}
		}
	}

	/*********************************************************************************/

	/*
	 * Handles the dimension element events.
	*/
	private class AuthorHandler extends ElementHandler
	{
		public void startElement (String namespaceURI,String name,String qName,Attributes atts) throws SAXException
		{
			nameCache = "";
			charCache = ""; // organization
		}

		public void endElement (String uri,String name,String qName) throws SAXException
		{
			map.addAuthor(nameCache,charCache);
		}
	}

	/*********************************************************************************/

	/*
	 * Handles the project element events.
	*/
	private class ProjectHandler extends ElementHandler
	{
		public void startElement (String namespaceURI,String name,String qName,Attributes atts) throws SAXException
		{
			nameCache = "";
			charCache = ""; // project code
		}

		public void endElement (String uri,String name,String qName) throws SAXException
		{
			map.setProject(nameCache,charCache);
		}
	}

	/*********************************************************************************/

	/*
	 * Handles the name element events.
	*/
	private class NameHandler extends ElementHandler
	{
		public void characters (char[] chars,int start,int len) throws SAXException
		{
			nameCache = String.valueOf(chars,start,len);
		}
	}

	/*********************************************************************************/

	/*
	 * Handles the code element events.
	*/
	private class CodeHandler extends ElementHandler
	{
		public void characters (char[] chars,int start,int len) throws SAXException
		{
			charCache = String.valueOf(chars,start,len); // project code
		}
	}

	/*********************************************************************************/

	/*
	 * Handles the organization element events.
	*/
	private class OrganizationHandler extends ElementHandler
	{
		public void characters (char[] chars,int start,int len) throws SAXException
		{
			charCache = String.valueOf(chars,start,len); // organization
		}
	}

	/*********************************************************************************/

	/*
	 * Handles the dimension element events.
	*/
	private class DimensionHandler extends ElementHandler
	{
		public void endElement (String uri,String name,String qName) throws SAXException
		{
			doubleCache = new double[dimensions.size()];
			Arrays.fill(doubleCache,0.0);
		}


	}

	/*********************************************************************************/

	/*
	 * Handles the dim_type element events.
	*/
	private class DimTypeHandler extends ElementHandler
	{
		public void characters (char[] chars,int start,int len) throws SAXException
		{
			if(!dimensions.contains(String.valueOf(chars,start,len)))
			{
				dimensions.addElement(String.valueOf(chars,start,len));
			}
		}
	}

	/*********************************************************************************/

	/*
	 * Handles the data element events.
	*/
	private class DataHandler extends ElementHandler
	{
		public void startElement (String namespaceURI,String name,String qName,Attributes atts) throws SAXException
		{
			data = true;
		}

		public void endElement (String uri,String name,String qName) throws SAXException
		{
			data = false;
		}
	}

	/*********************************************************************************/

	/*
	 * Handles the node element events.
	*/
	private class NodeHandler extends ElementHandler
	{
		public void startElement (String namespaceURI,String name,String qName,Attributes atts) throws SAXException
		{
			if(data==true)
			{
				node = true;
				labelCache = atts.getValue(0);
			}
		}

		public void endElement (String uri,String name,String qName) throws SAXException
		{
			if(data==true)
			{
				node = false;
				iVector.addInputVector(new SomNode(labelCache, doubleCache));
				Arrays.fill(doubleCache,0.0);
			}
		}
	}

	/*********************************************************************************/

	/*
	 * Handles the events in the dim element
	*/
	private class DimHandler extends ElementHandler
	{
		public void startElement (String namespaceURI,String name,String qName,Attributes atts) throws SAXException
		{
			if(node==true)
			{
				indexCache = dimensions.indexOf(atts.getValue(0));
			}
		}

		public void characters (char[] chars,int start,int len) throws SAXException
		{
			if(node==true)
			{
				try
				{
					doubleCache[indexCache] = Double.parseDouble(String.valueOf(chars,start,len));
				}
				catch(NumberFormatException nfe)
				{
					System.out.println(nfe.getMessage());
				}
			}
		}
	}

	/*********************************************************************************/
}