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

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Here is the source code for edu.lternet.pasta.portal.MapSearchServlet.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 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.DataPackageManagerClient;
import edu.lternet.pasta.portal.search.MapResultSetUtility;

public class MapSearchServlet extends DataPortalServlet {

    /*
     * Class variables
     */

    private static final Logger logger = Logger.getLogger(edu.lternet.pasta.portal.MapSearchServlet.class);
    private static final long serialVersionUID = 1L;

    private static String cwd = null;
    private static String xslpath = null;
    private static final String forward = "./mapSearchResult.jsp";

    /*
     * Instance variables
     */

    /**
     * Constructor of the object.
     */
    public MapSearchServlet() {
        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 {
        String mapSearchResults = null;
        HttpSession httpSession = request.getSession();

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

        String queryText = (String) httpSession.getAttribute("queryText");
        mapSearchResults = executeQuery(uid, queryText);

        request.setAttribute("mapSearchResults", mapSearchResults);
        RequestDispatcher requestDispatcher = request.getRequestDispatcher(forward);
        requestDispatcher.forward(request, response);
    }

    /*
     * Executes the query via the DataPackageManagerClient object
     */
    private String executeQuery(String uid, String queryText) throws ServletException {
        String mapSearchResults = null;
        final int ROWS_MAX = 100000;

        try {
            DataPackageManagerClient dpmClient = new DataPackageManagerClient(uid);
            String extendedQueryText = String.format("%s&rows=%d", queryText, ROWS_MAX);
            String xml = dpmClient.searchDataPackages(extendedQueryText);
            MapResultSetUtility mapResultSetUtility = new MapResultSetUtility();
            mapSearchResults = mapResultSetUtility.parseResultSet(xml);
        } catch (Exception e) {
            handleDataPortalError(logger, e);
        }

        return mapSearchResults;
    }

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

}