/**
* The contents of this file are subject to the license and copyright
* detailed in the LICENSE and NOTICE files at the root of the source
* tree and available online at
*
* http://www.dspace.org/license/
*/
package org.dspace.app.xmlui.cocoon;
import java.io.IOException;
import java.sql.SQLException;
import org.apache.cocoon.ProcessingException;
import org.apache.cocoon.ResourceNotFoundException;
import org.apache.cocoon.generation.AbstractGenerator;
import org.dspace.app.xmlui.utils.ContextUtil;
import org.dspace.authorize.AuthorizeException;
import org.dspace.content.DSpaceObject;
import org.dspace.content.Item;
import org.dspace.content.crosswalk.CrosswalkException;
import org.dspace.content.crosswalk.DisseminationCrosswalk;
import org.dspace.core.Context;
import org.dspace.core.PluginManager;
import org.dspace.handle.HandleManager;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.output.SAXOutputter;
import org.xml.sax.SAXException;
/**
* Generate an ORE aggregation of a DSpace Item. The object to be rendered should be an item identified by pasing
* in one of the two parameters: handle or internal. The fragment parameter determines the encoding format for
* the aggregation; only Atom is supported at this time.
* @author Alexey Maslov
*/
public class DSpaceOREGenerator extends AbstractGenerator
{
/**
* Generate the ORE Aggregation.
*/
public void generate() throws IOException, SAXException,
ProcessingException {
try {
// Grab the context.
Context context = ContextUtil.obtainContext(objectModel);
Item item = getItem(context);
if (item == null)
{
throw new ResourceNotFoundException("Unable to locate object.");
}
// Instantiate and execute the ORE plugin
SAXOutputter out = new SAXOutputter(contentHandler);
DisseminationCrosswalk xwalk = (DisseminationCrosswalk)PluginManager.getNamedPlugin(DisseminationCrosswalk.class,"ore");
Element ore = xwalk.disseminateElement(item);
out.output(ore);
/* Generate the METS document
contentHandler.startDocument();
adapter.renderMETS(contentHandler,lexicalHandler);
contentHandler.endDocument();*/
} catch (JDOMException je) {
throw new ProcessingException(je);
} catch (AuthorizeException ae) {
throw new ProcessingException(ae);
} catch (CrosswalkException ce) {
throw new ProcessingException(ce);
} catch (SQLException sqle) {
throw new ProcessingException(sqle);
}
}
private Item getItem(Context context) throws SQLException, CrosswalkException
{
// Determine the correct adatper to use for this item
String handle = parameters.getParameter("handle",null);
String internal = parameters.getParameter("internal",null);
if (handle != null)
{
// Specified using a regular handle.
DSpaceObject dso = HandleManager.resolveToObject(context, handle);
// Handles can be either items or containers.
if (dso instanceof Item)
{
return (Item) dso;
}
else
{
throw new CrosswalkException("ORE dissemination only available for DSpace Items.");
}
}
else if (internal != null)
{
// Internal identifier, format: "type:id".
String[] parts = internal.split(":");
if (parts.length == 2)
{
String type = parts[0];
int id = Integer.valueOf(parts[1]);
if ("item".equals(type))
{
return Item.find(context,id);
}
else
{
throw new CrosswalkException("ORE dissemination only available for DSpace Items.");
}
}
}
return null;
}
}