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/**
* This file is part of the CRISTAL-iSE kernel.
* Copyright (c) 2001-2014 The CRISTAL Consortium. All rights reserved.
*
* 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 3 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; with out 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* http://www.fsf.org/licensing/licenses/lgpl.html
*/
package org.cristalise.kernel.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.Properties;
import java.util.StringTokenizer;
import org.cristalise.kernel.common.InvalidDataException;
import org.cristalise.kernel.persistency.outcome.Outcome;
import org.cristalise.kernel.process.resource.ResourceLoader;
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;
/**************************************************************************
* Loads all mapfiles, and wraps marshalling/unmarshalling
*
* @author $Author: abranson $ $Date: 2004/10/20 14:10:21 $
* @version $Revision: 1.12 $
**************************************************************************/
public class CastorXMLUtility
{
public static final String CASTOR_XML_SERIALIZER_FACTORY = "org.exolab.castor.xml.serializer.factory";
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 aResourceLoader
* the resource loader able to return the right class loader
* @param aAppProperties
* the application properties containing optional castor
* configuration
* @param mapURL
* the root URL for the mapfiles
* @throws InvalidDataException
*/
public CastorXMLUtility(final ResourceLoader aResourceLoader,
final Properties aAppProperties, final URL mapURL)
throws InvalidDataException {
// load index
Logger.msg(3,String.format( "CastorXMLUtility.<init> Loading maps from [%s]",mapURL));
String index;
try {
index = FileStringUtility.url2String( new URL(mapURL, "index") );
} catch (Exception e) {
throw new InvalidDataException(String.format("Could not load map index from [%s]",mapURL));
}
// retrieve the class loader of the class "CastorXMLUtility"
ClassLoader defaultClassLoader = aResourceLoader
.getClassLoader(CastorXMLUtility.class.getName());
Logger.msg(3, String.format(
"CastorXMLUtility.<init>: defaultClassLoader=[%s]",
defaultClassLoader));
StringTokenizer sTokenizer = new StringTokenizer(index);
int wNbMap = sTokenizer.countTokens();
// init the castor mapping using the classloader of the class "CastorXMLUtility"
Mapping thisMapping = new Mapping(defaultClassLoader);
HashSet<String> loadedMapURLs = new HashSet<String>();
try {
int wMapIdx=0;
while( sTokenizer.hasMoreTokens() ) {
String thisMap = sTokenizer.nextToken();
String thisMapURL = new URL(mapURL, thisMap).toString();
wMapIdx++;
if( !loadedMapURLs.contains(thisMapURL) ) {
Logger.msg( 3,
String.format("CastorXMLUtility.<init>: Adding mapping file (%d/%d):[%s]", wMapIdx, wNbMap, thisMapURL));
thisMapping.loadMapping( new URL(thisMapURL) );
loadedMapURLs.add( thisMapURL );
}
else {
Logger.msg(3,"Map file already loaded:"+thisMapURL);
}
}
mappingContext = new XMLContext();
mappingContext.setClassLoader(defaultClassLoader);
// if the aAppProperties contains castor properties then
if (aAppProperties!= null && aAppProperties.containsKey(CASTOR_XML_SERIALIZER_FACTORY)) {
mappingContext.setProperty(CASTOR_XML_SERIALIZER_FACTORY,
aAppProperties
.getProperty(CASTOR_XML_SERIALIZER_FACTORY));
Logger.msg(3, String.format(
"CastorXMLUtility.<init>: castor prop: %s=[%s]",
CASTOR_XML_SERIALIZER_FACTORY, mappingContext
.getProperty(CASTOR_XML_SERIALIZER_FACTORY)));
}
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, String.format("Loaded [%d] maps from [%s]", loadedMapURLs.size(), mapURL));
}
/**************************************************************************
* 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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