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| /*
Copyright (C) 2002 Martin Bravenboer
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
*/
package org.pandoramix.xml;
import org.xml.sax.Attributes;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.SAXException;
import java.lang.reflect.*;
import java.util.HashMap;
import java.util.StringTokenizer;
public class DispatchingContentHandler extends DefaultHandler
{
private static final Class[] START_ELEMENT_PARAMETERS;
private static final Class[] END_ELEMENT_PARAMETERS;
static
{
START_ELEMENT_PARAMETERS = new Class[]{Attributes.class};
END_ELEMENT_PARAMETERS = new Class[0];
}
private final HashMap _methods;
private final boolean _debug;
public DispatchingContentHandler()
{
this(false);
}
public DispatchingContentHandler(boolean debug)
{
super();
_methods = new HashMap();
_debug = debug;
}
protected String transformElementToMethod(String qName)
{
StringBuffer result = new StringBuffer(qName.length());
StringTokenizer tokenizer = new StringTokenizer(qName, "-");
while(tokenizer.hasMoreTokens())
{
String token = tokenizer.nextToken();
result.append(Character.toUpperCase(token.charAt(0)));
result.append(token.substring(1, token.length()));
}
return result.toString();
}
public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException
{
Method startElementMethod = getMethod("startElement", new Class[0]);
invoke(startElementMethod, new Object[0]);
Method method = getMethod("start" + transformElementToMethod(qName), START_ELEMENT_PARAMETERS);
invoke(method, new Object[]{atts});
}
public void endElement(String namespaceURI, String localName, String qName) throws SAXException
{
Method endElementMethod = getMethod("endElement", new Class[0]);
invoke(endElementMethod, new Object[0]);
Method method = getMethod("end" + transformElementToMethod(qName), END_ELEMENT_PARAMETERS);
invoke(method, new Object[0]);
}
private void invoke(Method method, Object[] arguments) throws SAXException
{
if(method != null)
{
try
{
method.invoke(this, arguments);
}
catch(InvocationTargetException exc)
{
System.err.println("Exception caused by method: " + method.toString());
throw new SAXException((Exception)exc.getTargetException());
}
catch(Exception exc)
{
if(exc instanceof SAXException)
{
throw (SAXException)exc;
}
else
{
throw new SAXException(exc);
}
}
}
}
private Method getMethod(String methodName, Class[] parameters)
{
Method result;
if(_methods.containsKey(methodName))
{
result = (Method) _methods.get(methodName);
}
else
{
result = getMethod(getClass(), methodName, parameters);
if(_debug && result == null)
{
System.out.println("No method: " + methodName);
}
_methods.put(methodName, result);
}
return result;
}
public static Method getMethod(Class methodClass, String methodName, Class[] parameterTypes)
{
try
{
return methodClass.getMethod(methodName, parameterTypes);
}
catch(NoSuchMethodException exc)
{
return null;
}
catch(SecurityException exc)
{
return null;
}
}
} |
:strip_exif()/u/31626/eend.gif?f=community)
/u/2046/pooh2.png?f=community)
. De gebruikte techniek is exact hetzelfde als de Walkabout implementatie in dit paper: 
.
