/**
 * 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.rdf.storage;

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.dspace.content.DSpaceObject;
import org.dspace.content.Site;
import org.dspace.core.Constants;
import org.dspace.core.Context;
import org.dspace.handle.HandleManager;
import org.dspace.utils.DSpace;

/**
 *
 * @author Pascal-Nicolas Becker (dspace -at- pascal -hyphen- becker -dot- de)
 */
public class HandleURIGenerator implements URIGenerator {
    private static final Logger log = Logger.getLogger(HandleURIGenerator.class);
    
    public String generateIdentifier(Context context, int type, int id, 
            String handle, String[] identifiers)
    {
        if (type == Constants.SITE)
        {
            return HandleManager.getCanonicalForm(Site.getSiteHandle());
        }
        
        if (type == Constants.COMMUNITY 
                || type == Constants.COLLECTION 
                || type == Constants.ITEM)
        {
            if (StringUtils.isEmpty(handle))
            {
                throw new IllegalArgumentException("Handle is null");
            }
            log.debug("Generated identifier " 
                + HandleManager.getCanonicalForm(handle) + " for "
                + Constants.typeText[type] + " " + Integer.toString(id) + ".");
            return HandleManager.getCanonicalForm(handle);
        }
        
        return null;
    }
    
    @Override
    public String generateIdentifier(Context context, DSpaceObject dso)
    {
        if (dso.getType() != Constants.SITE
                && dso.getType() != Constants.COMMUNITY
                && dso.getType() != Constants.COLLECTION
                && dso.getType() != Constants.ITEM)
        {
            return null;
        }
        
        return generateIdentifier(context, dso.getType(), dso.getID(), 
                dso.getHandle(), dso.getIdentifiers(context));
    }
}