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Java classes providing resolving functionality for Persistent Identifiers. Main focus is on National Bibliography Numbers, but some other known systems are also supported. See the official URN:NBN Resolver http://nbn-resolving.org or http://persid.org

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/* *********************************************************************
 * Class RdfXmlView
 * 
 * Copyright (c) 2011-2012, German National Library/Deutsche Nationalbibliothek
 * Adickesallee 1, D-60322 Frankfurt am Main, Federal Republic of Germany 
 *
 * This program is free software.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * Thomas Haidlas -- German National Library
 * Kadir Karaca Kocer -- German National Library
 **********************************************************************/

/* ********************************************************************
 * CHANGELOG:
 * 
 * 2012-04-03 Port to Maven by Timo Heck & Karaca Kocer
 * 2011-12-12 Licence information and JavaDocs by Karaca Kocer
 * Created on 2011-12-08 by Thomas Haidlas -- German National Library
 ********************************************************************/

package org.nbnResolving.views;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.nbnResolving.converters.RdfXmlConverter;
import org.nbnResolving.pidef.PidefDocument;

import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.vocabulary.DCTerms;

/**
 * Renders all UrnRecord to RDF/XML.
 * 
 * @author Thomas Haidlas
 */

public final class RdfXmlView extends BaseView {

	private static final Map PREFIXES = new HashMap();
	private static final String RDF_FORMAT = "RDF/XML-ABBREV";
	
	private RdfXmlConverter rdfConverter;

	static{
		PREFIXES.put("dcterms", DCTerms.NS);
		PREFIXES.put("rdfs", "http://www.w3.org/2000/01/rdf-schema#");
		PREFIXES.put("owl", com.hp.hpl.jena.vocabulary.OWL.NS);				
	}
	
	/** Constructor */
	public RdfXmlView(){
		setContentType("application/rdf+xml");		
	}
	
	/**
	 * @return RDF/XML converter
	 */
	public RdfXmlConverter getRdfConverter() {
		return this.rdfConverter;
	}

	/**
	 * @param converter Converter to set
	 */
	public void setRdfConverter(final RdfXmlConverter converter) {
		this.rdfConverter = converter;
	}

	@Override
	protected void renderMergedOutputModel(final Map model,
			final HttpServletRequest request, final HttpServletResponse response)
			throws Exception {
		//final String identifier = (String) model.get("identifier");
		final Model rdfModel = ModelFactory.createDefaultModel();
		rdfModel.setNsPrefixes(PREFIXES);
		
		for (Map.Entry entry : model.entrySet()) {
			if(entry.getValue() instanceof PidefDocument){
				final PidefDocument record = (PidefDocument) entry.getValue();
				this.rdfConverter.addRecordToModel(rdfModel, record);
			}
		}

		rdfModel.write(response.getOutputStream(), RDF_FORMAT);
	}
}