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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.Properties;
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;
import com.c2kernel.process.resource.ResourceLoader;
/**************************************************************************
* 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 pCastorContext;
/**
* 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 containint optionnal castor
* configuration
* @param aMapsSubPath
* the map root sub path (in the kernel path)
* @throws InvalidDataException
*/
public CastorXMLUtility(final ResourceLoader aResourceLoader,
final Properties aAppProperties, final String aMapsSubPath)
throws InvalidDataException {
// build base url
URL wMapsURL ;
try {
wMapsURL = aResourceLoader.getKernelResourceURL(aMapsSubPath);
} catch (MalformedURLException e) {
throw new InvalidDataException(String.format(
"Invalid Resource Location [%s]. Cause:%s", aMapsSubPath,
e.getLocalizedMessage()));
}
// load index
Logger.msg(3,String.format( "CastorXMLUtility.<init> Loading maps from [%s]",wMapsURL));
String index;
try {
index = FileStringUtility.url2String( new URL(wMapsURL, "index") );
} catch (Exception e) {
throw new InvalidDataException(String.format("Could not load map index from [%s]",wMapsURL));
}
// retrieve the class loader of the class "CastorXMLUtility"
ClassLoader wKernelClassLoader = aResourceLoader
.getClassLoader(CastorXMLUtility.class.getName());
Logger.msg(3, String.format(
"CastorXMLUtility.<init>: iuse KernelClassLoader=[%s]",
wKernelClassLoader));
StringTokenizer sTokenizer = new StringTokenizer(index);
int wNbMap = sTokenizer.countTokens();
// init the castor mapping using the classloader of the class "CastorXMLUtility"
Mapping wCastorMapping = new Mapping(wKernelClassLoader);
HashSet<URL> loadedMapURLs = new HashSet<URL>();
try {
int wMapIdx=0;
while( sTokenizer.hasMoreTokens() ) {
String wCurrentMap = sTokenizer.nextToken();
URL wCurrentMapURL = new URL(wMapsURL, wCurrentMap);
wMapIdx++;
if( !loadedMapURLs.contains(wCurrentMapURL) ) {
Logger.msg(
3,
String.format(
"CastorXMLUtility.<init>: Adding mapping file (%d/%d):[%s]",
wMapIdx, wNbMap, wCurrentMapURL));
wCastorMapping.loadMapping( wCurrentMapURL );
loadedMapURLs.add( wCurrentMapURL );
}
else {
Logger.msg(3,"Map file already loaded:"+wCurrentMapURL);
}
}
pCastorContext = new XMLContext();
pCastorContext.setClassLoader(wKernelClassLoader);
// if the aAppProperties contains castor properties then
if (aAppProperties.contains(CASTOR_XML_SERIALIZER_FACTORY)) {
pCastorContext.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, pCastorContext
.getProperty(CASTOR_XML_SERIALIZER_FACTORY)));
}
pCastorContext.addMapping(wCastorMapping);
} 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(),wMapsURL));
}
/**************************************************************************
* 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 = pCastorContext.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 = pCastorContext.createUnmarshaller();
return unmarshaller.unmarshal( sReader );
}
}
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