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/**
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* '$RCSfile$'
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* Copyright: 2005 University of New Mexico and the
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* Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* '$Author$'
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* '$Date$'
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* '$Revision$'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat.advancedsearch;
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import java.io.File;
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import java.io.IOException;
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import javax.servlet.RequestDispatcher;
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import javax.servlet.ServletConfig;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpSession;
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import edu.ucsb.nceas.metacat.client.*;
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import edu.ucsb.nceas.utilities.Options;
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/**
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* @author dcosta
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*
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* The BrowseServlet class executes a browse action. This is equivalent to
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* a simple search, but the user clicks on a link to determine the search term.
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*/
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public class BrowseServlet extends HttpServlet {
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/*
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* Class fields
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*/
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private static final String CONFIG_DIR = "WEB-INF";
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private static final String CONFIG_NAME = "metacat.properties";
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static final long serialVersionUID = 0; // Needed for Eclipse warning.
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// Instance Variables
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private String contextString = "";
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// Methods
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/**
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* Executes a browse-based simple search.
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*/
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public void doPost(HttpServletRequest request, HttpServletResponse response)
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throws IOException, ServletException {
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AdvancedSearch advancedSearch;
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String browseValue;
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RequestDispatcher dispatcher;
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HttpSession httpSession = request.getSession();
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Metacat metacat = (Metacat) httpSession.getAttribute("metacat");
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MetacatHelper metacatHelper = new MetacatHelper();
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String metacatURL;
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String qformat = (String) httpSession.getAttribute("qformat");
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String result = "";
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final String resultsJSP = metacatHelper.getResultsJSP();
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ServletContext servletContext = httpSession.getServletContext();
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String xslPath = metacatHelper.getResultsetXSL(request);
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// First check whether the metacat URL was set as a context-param.
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metacatURL = servletContext.getInitParameter("metacatURL");
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// If no metacat URL was configured, then derive the metacat URL from the
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// server name and server port.
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if (metacatURL == null || metacatURL.equals("")) {
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String serverName = request.getServerName();
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int serverPort = request.getServerPort();
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metacatURL =
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metacatHelper.constructMetacatURL(serverName, serverPort, contextString);
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}
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// Tell the web server that the response is HTML
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response.setContentType("text/html");
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// Fetch the browseValue parameter from the request and execute a search
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advancedSearch = new AdvancedSearch(null);
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browseValue = request.getParameter("browseValue");
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result = advancedSearch.executeSearch(metacatURL, metacat, qformat,
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xslPath, browseValue);
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// Store the result HTML string in the request for retrieval by
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// the metacatpathqueryresults.jsp form.
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request.setAttribute("result", result);
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dispatcher = request.getRequestDispatcher(resultsJSP);
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dispatcher.forward(request, response);
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}
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/**
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* Initializes the servlet. Reads properties and initializes object fields.
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*
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* @throws ServletException
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*/
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public void init(ServletConfig config) throws ServletException {
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ServletContext context = null;
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String dirPath;
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Options options = null;
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super.init(config);
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context = config.getServletContext();
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dirPath = context.getRealPath(CONFIG_DIR);
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File propertyFile = new File(dirPath, CONFIG_NAME);
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try {
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options = Options.initialize(propertyFile);
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}
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catch (IOException e) {
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System.err.println("Error in loading options: " + e.getMessage());
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}
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this.contextString = options.getOption("context");
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}
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}
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