org.nbnResolving.views.XmlView Maven / Gradle / Ivy

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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 XmlView
 * 
 * Copyright (c) 2011-2013, 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.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.namespace.QName;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.apache.xmlbeans.XmlCursor;
import org.apache.xmlbeans.XmlOptions;
import org.nbnResolving.pidef.PidefDocument;
import org.nbnResolving.resolver.controller.error.ErrorHandler;

/**
 * Class to generate XML response to user resolving request. 
 */
public class XmlView extends BaseView {
    private static final Log LOGGER = LogFactory.getLog(XmlView.class);
	private static final XmlOptions XML_OPTIONS = new org.apache.xmlbeans.XmlOptions();
	
	static {
		XML_OPTIONS.setCharacterEncoding("UTF-8");
		XML_OPTIONS.setSaveNamespacesFirst();
		XML_OPTIONS.setValidateStrict();
		XML_OPTIONS.setSavePrettyPrint();
		XML_OPTIONS.setSaveOuter();

		//options.setSaveImplicitNamespaces(implicitNamespaces)
		java.util.HashMap suggestedPrefixes = new java.util.HashMap();
		suggestedPrefixes.put("http://nbn-resolving.org/pidef", "pidef");
		XML_OPTIONS.setSaveSuggestedPrefixes(suggestedPrefixes);
	}

	/** Constructor*/
	public XmlView(){
		setContentType("text/xml");		
	}
	
	@Override
	protected void renderMergedOutputModel(final Map model, final HttpServletRequest request,
			                               final HttpServletResponse response) throws Exception {
		
		for (Map.Entry entry : model.entrySet()) {
			if (entry.getValue() instanceof PidefDocument) {
				PidefDocument doc = (PidefDocument) entry.getValue();
				
				//add the schemaLocation. See: http://wiki.apache.org/xmlbeans/XmlBeansFaq#xsiSchemaLocation
				XmlCursor cursor = doc.newCursor();
				if (cursor.toFirstChild()) {
					cursor.insertComment("-\nThis is a computer generated response to your request listed below." +
							" Do NOT modify it manually!" +
							"\nIn case of a problem see the XML Schema Definition (http://nbn-resolving.org/schemas/pidef/1.0/pidef.xsd) first." +
					        "\nKadir Karaca Ko\u00E7er - German National Library\n-");
					QName qn = new QName("http://www.w3.org/2001/XMLSchema-instance", "schemaLocation");
					String location = "http://nbn-resolving.org/pidef http://nbn-resolving.org/schemas/pidef/1.0/pidef.xsd";
					cursor.setAttributeText(qn, location);
				}
				cursor.dispose();
				
				final String requestUrl = doc.getPidef().getHeader().getRequest();
				final String providerId = doc.getPidef().getHeader().getSource(); 
			
				try{
					doc.save(response.getOutputStream(), XML_OPTIONS);
				} catch (Exception e) {
					String message = e.getMessage();
					LOGGER.error("XmlView: Exception: " + message);
					//error! print the error text & error message
					response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
					doc = ErrorHandler.getErrorDocument(requestUrl, providerId, e);
					doc.save(response.getOutputStream(), XML_OPTIONS);
				}
				return;	
			}
		}
	}
}