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package com.c2kernel.utils;
//Java
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashSet;
import java.util.StringTokenizer;
import org.exolab.castor.mapping.Mapping;
import org.exolab.castor.mapping.MappingException;
import org.exolab.castor.xml.MarshalException;
import org.exolab.castor.xml.Marshaller;
import org.exolab.castor.xml.Unmarshaller;
import org.exolab.castor.xml.ValidationException;
import org.exolab.castor.xml.XMLContext;
import com.c2kernel.common.InvalidDataException;
import com.c2kernel.persistency.outcome.Outcome;
/**************************************************************************
* Loads all mapfiles, and wraps marshalling/unmarshalling
*
* @author $Author: abranson $ $Date: 2004/10/20 14:10:21 $
* @version $Revision: 1.12 $
**************************************************************************/
public class CastorXMLUtility
{
private XMLContext mappingContext;
/**
* Looks for a file called 'index.xml' at the given URL, and loads every file
* listed in there by relative path
*
* @param mapURL - map root
*/
public CastorXMLUtility(URL mapURL) throws InvalidDataException {
// load index
Logger.msg(3, "Loading maps from "+mapURL);
String index;
try {
index = FileStringUtility.url2String( new URL(mapURL, "index") );
} catch (Exception e) {
Logger.warning("Could not load map index from "+mapURL.toString());
return;
}
StringTokenizer sTokenizer = new StringTokenizer(index);
Mapping thisMapping = new Mapping();
HashSet<URL> loadedMapURLs = new HashSet<URL>();
try {
while( sTokenizer.hasMoreTokens() ) {
String thisMap = sTokenizer.nextToken();
URL thisMapURL = new URL(mapURL, thisMap);
if( !loadedMapURLs.contains(thisMapURL) ) {
Logger.msg(7, "Adding mapping file:"+thisMapURL);
thisMapping.loadMapping( thisMapURL );
loadedMapURLs.add( thisMapURL );
}
else {
Logger.msg("Map file already loaded:"+thisMapURL);
}
}
mappingContext = new XMLContext();
mappingContext.addMapping(thisMapping);
} catch (MappingException ex) {
Logger.error(ex);
throw new InvalidDataException("XML Mapping files are not valid: "+ex.getMessage());
} catch (MalformedURLException ex) {
Logger.error(ex);
throw new InvalidDataException("Mapping file location invalid: "+ex.getMessage());
} catch (IOException ex) {
Logger.error(ex);
throw new InvalidDataException("Could not read XML mapping files: "+ex.getMessage());
}
Logger.msg(1, "Loaded all maps from "+mapURL.toString());
}
/**************************************************************************
* Marshalls a mapped object to string. The mapping must be loaded before.
* See updateMapping().
**************************************************************************/
public String marshall( Object obj )
throws IOException,
MappingException,
MarshalException,
ValidationException
{
if (obj == null) return "<NULL/>";
if (obj instanceof Outcome)
return ((Outcome)obj).getData();
StringWriter sWriter = new StringWriter();
Marshaller marshaller = mappingContext.createMarshaller();
marshaller.setWriter(sWriter);
marshaller.setMarshalAsDocument( false );
marshaller.marshal( obj );
return sWriter.toString();
}
/**************************************************************************
* Unmarshalls a mapped object from string. The mapping must be loaded before.
* See updateMapping().
**************************************************************************/
public Object unmarshall( String data )
throws IOException,
MappingException,
MarshalException,
ValidationException
{
if (data.equals("<NULL/>")) return null;
StringReader sReader = new StringReader( data );
Unmarshaller unmarshaller = mappingContext.createUnmarshaller();
return unmarshaller.unmarshal( sReader );
}
}
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