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

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

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/*
 *
 * $Date$
 * $Author$
 * $Revision$
 *
 * 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.ArrayList;

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.commons.lang3.text.StrTokenizer;
import org.apache.log4j.Logger;

import edu.lternet.pasta.client.DataPackageManagerClient;
import edu.lternet.pasta.client.PastaAuthenticationException;
import edu.lternet.pasta.client.PastaConfigurationException;

public class IdentifierBrowseServlet extends DataPortalServlet {

    /**
     * Class variables
     */

    private static final Logger logger = Logger.getLogger(edu.lternet.pasta.portal.IdentifierBrowseServlet.class);
    private static final long serialVersionUID = 1L;
    private static final String forward = "./dataPackageBrowser.jsp";
    private static final String browseMessage = "Select a data package "
            + "<em>scope.identifier</em> value to view the most current " + "revision of the data package lineage.";
    private static String pastaUriHead = null;

    /**
     * Constructor of the object.
     */
    public IdentifierBrowseServlet() {
        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 {

        HttpSession httpSession = request.getSession();

        String uid = (String) httpSession.getAttribute("uid");

        if (uid == null || uid.isEmpty())
            uid = "public";

        String scope = request.getParameter("scope");

        String text = null;
        String html = null;
        Integer count = 0;

        if (scope != null && !(scope.isEmpty())) {

            try {

                DataPackageManagerClient dpmClient = new DataPackageManagerClient(uid);
                text = dpmClient.listDataPackageIdentifiers(scope);

                StrTokenizer tokens = new StrTokenizer(text);

                html = "<ol>\n";

                ArrayList<String> arrayList = new ArrayList<String>();

                // Add scope/identifier values to a sorted set
                while (tokens.hasNext()) {
                    arrayList.add(tokens.nextToken());
                    count++;
                }

                // Output sorted set of scope/identifier values
                for (String identifier : arrayList) {

                    html += "<li><a class=\"searchsubcat\" href=\"./mapbrowse?scope=" + scope + "&identifier="
                            + identifier + "\">" + scope + "." + identifier + "</a></li>\n";

                }

                html += "</ol>\n";

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

        } else {
            html = "<p class=\"warning\"> Error: \"scope\" field empty</p>\n";
        }

        request.setAttribute("browsemessage", browseMessage);
        request.setAttribute("html", html);
        request.setAttribute("count", count.toString());
        RequestDispatcher requestDispatcher = request.getRequestDispatcher(forward);
        requestDispatcher.forward(request, response);

    }

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

        if ((pastaUriHead == null) || (pastaUriHead.equals(""))) {
            throw new ServletException("No value defined for 'pasta.uriHead' property.");
        }
        // Put your code here
    }

}