Java tutorial
/* ************************************************************************ ******************* CANADIAN ASTRONOMY DATA CENTRE ******************* ************** CENTRE CANADIEN DE DONNES ASTRONOMIQUES ************** * * (c) 2015. (c) 2015. * Government of Canada Gouvernement du Canada * National Research Council Conseil national de recherches * Ottawa, Canada, K1A 0R6 Ottawa, Canada, K1A 0R6 * All rights reserved Tous droits rservs * * NRC disclaims any warranties, Le CNRC dnie toute garantie * expressed, implied, or nonce, implicite ou lgale, * statutory, of any kind with de quelque nature que ce * respect to the software, soit, concernant le logiciel, * including without limitation y compris sans restriction * any warranty of merchantability toute garantie de valeur * or fitness for a particular marchande ou de pertinence * purpose. NRC shall not be pour un usage particulier. * liable in any event for any Le CNRC ne pourra en aucun cas * damages, whether direct or tre tenu responsable de tout * indirect, special or general, dommage, direct ou indirect, * consequential or incidental, particulier ou gnral, * arising from the use of the accessoire ou fortuit, rsultant * software. Neither the name de l'utilisation du logiciel. Ni * of the National Research le nom du Conseil National de * Council of Canada nor the Recherches du Canada ni les noms * names of its contributors may de ses participants ne peuvent * be used to endorse or promote tre utiliss pour approuver ou * products derived from this promouvoir les produits drivs * software without specific prior de ce logiciel sans autorisation * written permission. pralable et particulire * par crit. * * This file is part of the Ce fichier fait partie du projet * OpenCADC project. OpenCADC. * * OpenCADC is free software: OpenCADC est un logiciel libre ; * you can redistribute it and/or vous pouvez le redistribuer ou le * modify it under the terms of modifier suivant les termes de * the GNU Affero General Public la GNU Affero General Public * License as published by the License? telle que publie * Free Software Foundation, par la Free Software Foundation * either version 3 of the : soit la version 3 de cette * License, or (at your option) licence, soit ( votre gr) * any later version. toute version ultrieure. * * OpenCADC is distributed in the OpenCADC est distribu * hope that it will be useful, dans lespoir quil vous * but WITHOUT ANY WARRANTY; sera utile, mais SANS AUCUNE * without even the implied GARANTIE : sans mme la garantie * warranty of MERCHANTABILITY implicite de COMMERCIALISABILIT * or FITNESS FOR A PARTICULAR ni dADQUATION UN OBJECTIF * PURPOSE. See the GNU Affero PARTICULIER. Consultez la Licence * General Public License for Gnrale Publique GNU Affero * more details. pour plus de dtails. * * You should have received Vous devriez avoir reu une * a copy of the GNU Affero copie de la Licence Gnrale * General Public License along Publique GNU Affero avec * with OpenCADC. If not, see OpenCADC ; si ce nest * <http://www.gnu.org/licenses/>. pas le cas, consultez : * <http://www.gnu.org/licenses/>. * * ************************************************************************ */ package ca.nrc.cadc.search; import ca.nrc.cadc.auth.AuthMethod; import ca.nrc.cadc.caom2.PublisherID; import ca.nrc.cadc.reg.Standards; import ca.nrc.cadc.reg.client.RegistryClient; import ca.nrc.cadc.web.ConfigurableServlet; import org.apache.http.client.utils.URIBuilder; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.net.URI; import java.net.URISyntaxException; import java.net.URL; /** * Servlet to redirect a caller to the appropriate place for a single request * download of a single CAOM-2 URI. */ public class PackageServlet extends ConfigurableServlet { /** * Only supported method. This will accept an ID parameter in the request * to query on. * * @param request The HTTP Request. * @param response The HTTP Response. * @throws IOException Any other errors. */ @Override protected void doGet(final HttpServletRequest request, final HttpServletResponse response) throws IOException { get(request, response, new RegistryClient()); } /** * Handle a GET request with the given Registry client to perform the lookup. * * @param request The HTTP Request. * @param response The HTTP Response. * @param registryClient The RegistryClient to do lookups. * @throws IOException Any request access problems. */ void get(final HttpServletRequest request, final HttpServletResponse response, final RegistryClient registryClient) throws IOException { // TODO: prior to version 2.5.0, this servlet supported multiple IDs. // TODO: Consider how this might be supported in future. final String[] idValues = request.getParameterValues("ID"); if (idValues.length > 1) { throw new UnsupportedOperationException("Multiple IDs in package lookup."); } else { final String IDValue = idValues[0]; if (IDValue.length() > 0) { try { final PublisherID publisherID = new PublisherID(URI.create(IDValue)); final URL serviceURL = registryClient.getServiceURL(publisherID.getResourceID(), Standards.PKG_10, AuthMethod.COOKIE); final URIBuilder builder = new URIBuilder(serviceURL.toURI()); builder.addParameter("ID", IDValue); response.sendRedirect(builder.build().toURL().toExternalForm()); } catch (URISyntaxException e) { throw new IOException(String.format("Service URL from %s is invalid.", IDValue), e); } } else { throw new UnsupportedOperationException("Invalid ID in package lookup."); } } } }