edu.lternet.pasta.portal.ProvenanceGeneratorServlet.java Source code

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Here is the source code for edu.lternet.pasta.portal.ProvenanceGeneratorServlet.java

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/*
 *
 * $Date: 2012-05-09 22:10:39 -0600 (Wed, 09 May 2012) $
 * $Author: mservilla $
 * $Revision: 2178 $
 *
 * Copyright 2011,2012 the University of New Mexico.
 *
 * This work was supported by National Science Foundation Cooperative
 * Agreements #DEB-0832652 and #DEB-0936498.
 *
 * 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.
 *
 */

package edu.lternet.pasta.portal;

import java.io.IOException;
import java.util.HashMap;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.log4j.Logger;

import edu.lternet.pasta.client.ProvenanceFactoryClient;
import edu.lternet.pasta.client.XSLTUtility;
import edu.lternet.pasta.common.UserErrorException;
import edu.lternet.pasta.common.XmlUtility;

public class ProvenanceGeneratorServlet extends DataPortalServlet {

    /*
     * Class variables
     */

    private static final Logger logger = Logger
            .getLogger(edu.lternet.pasta.portal.ProvenanceGeneratorServlet.class);
    private static final long serialVersionUID = 1L;
    private static final String forward = "./provenanceGenerator.jsp";
    private static String cwd = null;
    private static String xslPath = "/WEB-INF/xsl/provenance.xsl";

    /*
     * Constructors
     */

    public ProvenanceGeneratorServlet() {
        super();
    }

    /**
     * Destruction of the servlet. <br>
     */
    public void destroy() {
        super.destroy(); // Just puts "destroy" string in log
        // Put your code here
    }

    /**
     * The doGet method of the servlet. <br>
     * 
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request
     *          the request send by the client to the server
     * @param response
     *          the response send by the server to the client
     * @throws ServletException
     *           if an error occurred
     * @throws IOException
     *           if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doPost(request, response);

    }

    /**
     * The doPost method of the servlet. <br>
     * 
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request
     *          the request send by the client to the server
     * @param response
     *          the response send by the server to the client
     * @throws ServletException
     *           if an error occurred
     * @throws IOException
     *           if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            HttpSession httpSession = request.getSession();
            String uid = (String) httpSession.getAttribute("uid");
            if (uid == null || uid.isEmpty())
                uid = "public";
            String packageId = request.getParameter("packageid");

            if (packageId != null) {
                ProvenanceFactoryClient provenanceFactoryClient = new ProvenanceFactoryClient(uid);
                String provenanceXML = provenanceFactoryClient.getProvenanceByPid(packageId);
                String provenanceHTML = transformToHTML(provenanceXML);
                String encodedProvenanceXML = XmlUtility.xmlEncode(provenanceXML);
                request.setAttribute("provenanceHTML", provenanceHTML);
                request.setAttribute("provenanceXML", encodedProvenanceXML);
                request.setAttribute("packageid", packageId);
                RequestDispatcher requestDispatcher = request.getRequestDispatcher(forward);
                requestDispatcher.forward(request, response);
            } else {
                throw new UserErrorException("Package identifier is null.");
            }

        } catch (Exception e) {
            handleDataPortalError(logger, e);
        }
    }

    private String transformToHTML(String xml) {
        String provenanceHTML = "";
        HashMap<String, String> parameterMap = new HashMap<String, String>();

        provenanceHTML = XSLTUtility.xmlToHtml(xml, cwd + xslPath, parameterMap);

        return provenanceHTML;
    }

    /**
     * Initialization of the servlet. <br>
     * 
     * @throws ServletException
     *           if an error occurs
     */
    public void init() throws ServletException {
        PropertiesConfiguration options = ConfigurationListener.getOptions();
        cwd = options.getString("system.cwd");
    }

}