eionet.cr.api.feeds.xmlconv.XmlConvFeedServlet.java Source code

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Here is the source code for eionet.cr.api.feeds.xmlconv.XmlConvFeedServlet.java

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/*
 * The contents of this file are subject to the Mozilla Public
 *
 * License Version 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is Content Registry 2.0.
 *
 * The Initial Owner of the Original Code is European Environment
 * Agency. Portions created by Tieto Eesti are Copyright
 * (C) European Environment Agency. All Rights Reserved.
 *
 * Contributor(s):
 * Jaanus Heinlaid, Tieto Eesti*/
package eionet.cr.api.feeds.xmlconv;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;

import eionet.cr.api.feeds.SubjectsRDFWriter;
import eionet.cr.common.Namespace;
import eionet.cr.common.Predicates;
import eionet.cr.dao.DAOFactory;
import eionet.cr.dao.SearchDAO;
import eionet.cr.dto.SearchResultDTO;
import eionet.cr.dto.SubjectDTO;

/**
 *
 * @author <a href="mailto:jaanus.heinlaid@tietoenator.com">Jaanus Heinlaid</a>
 *
 */
public class XmlConvFeedServlet extends HttpServlet {

    /** */
    private static final String SCHEMA_PARAM = "schema";

    /** */
    private static final Logger LOGGER = Logger.getLogger(XmlConvFeedServlet.class);

    /** */
    public static final String INCLUDE_DERIVED_VALUES = "inclDeriv";

    /*
     * (non-Javadoc)
     *
     * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String methodName = XmlConvFeedServlet.class.getSimpleName() + ".doGet()";
        LOGGER.debug("Entered " + methodName);

        response.setContentType("text/xml");

        try {
            List<SubjectDTO> subjects = new ArrayList<SubjectDTO>();
            String xmlSchema = request.getParameter(SCHEMA_PARAM);
            if (!StringUtils.isBlank(xmlSchema)) {

                SearchDAO searchDao = DAOFactory.get().getDao(SearchDAO.class);
                Map<String, String> criteria = new HashMap<String, String>();
                criteria.put(Predicates.CR_SCHEMA, xmlSchema);

                SearchResultDTO<SubjectDTO> result = searchDao.searchByFilters(criteria, false, null, null, null,
                        true);

                int subjectCount = result.getMatchCount();
                LOGGER.debug(methodName + ", " + subjectCount + " subjects found in total");
                subjects = result.getItems();
            }

            SubjectsRDFWriter rdfWriter = new SubjectsRDFWriter(
                    request.getParameter(XmlConvFeedServlet.INCLUDE_DERIVED_VALUES) != null);
            rdfWriter.addNamespace(Namespace.CR);
            rdfWriter.addNamespace(Namespace.DC);
            rdfWriter.addNamespace(Namespace.OWL);
            rdfWriter.addNamespace(Namespace.ROD);
            rdfWriter.addNamespace(Namespace.EPER);

            rdfWriter.write(subjects, response.getOutputStream());
        } catch (Exception e) {
            LOGGER.error("Error in " + methodName, e);
            if (!response.isCommitted()) {
                response.sendError(500);
            }
        }

        response.getOutputStream().flush();

    }
}