Metacat

/**

 *  '$RCSfile$'

 *  Copyright: 2005 University of New Mexico and the 

 *             Regents of the University of California and the

 *             National Center for Ecological Analysis and Synthesis

 *   '$Author: costa $'

 *     '$Date: 2005-11-16 09:57:33 -0800 (Wed, 16 Nov 2005) $'

 * '$Revision: 2741 $'

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 */

package edu.ucsb.nceas.metacat.advancedsearch;

import java.io.IOException;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletContext;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import edu.ucsb.nceas.metacat.client.*;

/** 

 * @author dcosta

 * 

 * The BrowseServlet class executes a browse action. This is equivalent to

 * a simple search, but the user clicks on a link to determine the search term.

 */

public class BrowseServlet extends HttpServlet {

  // Instance Variables -- (Not used because they are not thread-safe.)

  // Methods

  /**

   * Executes a browse-based simple search.

   */

  public void doPost(HttpServletRequest request, HttpServletResponse response)

      throws IOException, ServletException {

    AdvancedSearch advancedSearch;

    String browseValue;

    RequestDispatcher dispatcher;

    HttpSession httpSession = request.getSession();

    Metacat metacat = (Metacat) httpSession.getAttribute("metacat");

    String metacatURL;

    String result = "";

    final String resultsJSP = "style/skins/default/advancedsearchresults.jsp";

    ServletContext servletContext = httpSession.getServletContext();

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

    String xslPath = servletContext.getRealPath("style/common/resultset.xsl");

    // First check whether the metacat URL was set as a context-param.

    metacatURL = servletContext.getInitParameter("metacatURL");

    // If no metacat URL was configured, then derive the metacat URL from the

    // server name and server port.

    if (metacatURL == null || metacatURL.equals("")) {

      MetacatHelper metacatHelper = new MetacatHelper();

      String serverName = request.getServerName();

      int serverPort = request.getServerPort();

      metacatURL = metacatHelper.constructMetacatURL(serverName, serverPort);

    }

    // Tell the web server that the response is HTML

    response.setContentType("text/html");

    // Fetch the browseValue parameter from the request and execute a search

    advancedSearch = new AdvancedSearch(null);

    browseValue = request.getParameter("browseValue");

    result = advancedSearch.executeSearch(metacatURL, metacat, xslPath, 

                                          browseValue);

    // Store the result HTML string in the request for retrieval by

    // the metacatpathqueryresults.jsp form.

    request.setAttribute("result", result);

    dispatcher = request.getRequestDispatcher(resultsJSP);

    dispatcher.forward(request, response);

  }

}