ostepu.process.process.java Source code

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Here is the source code for ostepu.process.process.java

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/* 
 * Copyright (C) 2017 Till Uhlig <till.uhlig@student.uni-halle.de>
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */
package ostepu.process;

import ostepu.process.commands.postCourse;
import ostepu.process.commands.deleteCourse;
import ostepu.process.commands.getCourseExists;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang3.StringUtils;
import ostepu.process.commands.postProcess;
import ostepu.request.httpAuth;

/**
 *
 * @author Till Uhlig {@literal <till.uhlig@student.uni-halle.de>}
 */
public class process extends HttpServlet {

    /**
     *
     */
    public String[][] restPattern = { { "POST", "/process" }, { "POST", "/course" },
            { "DELETE", "/course/([0-9_]*)" }, { "GET", "/link/exists/course/([0-9_]*)" } };

    /**
     * hier werden alle aufrufbaren Befehle als Objekt gesammelt (werden dann
     * von processRequest aufgerufen)
     */
    protected command[] restCommands = { new postProcess(), new postCourse(), new deleteCourse(),
            new getCourseExists() };

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods. (hier wird der richtige Unterbefehl ausgewhlt)
     *
     * @param request  servlet request
     * @param response servlet response
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response) {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out;
        try {
            out = response.getWriter();
        } catch (IOException ex) {
            Logger.getLogger(process.class.getName()).log(Level.SEVERE, null, ex);
            response.setStatus(500);
            return;
        }
        String pathInfo = StringUtils.substring(request.getRequestURI(), request.getContextPath().length());

        // ldt die Anmeldedaten (eventuell fr eine httpAuth)
        httpAuth.loadLocalAuthData(getServletContext());

        String method = request.getMethod();
        try {
            Matcher matcher;
            for (int i = 0; i < restPattern.length; i++) {
                String[] pattern = restPattern[i];
                if (method == null ? pattern[0] != null : !method.equals(pattern[0])) {
                    continue;
                }
                Pattern regExGetCommands = Pattern.compile(pattern[1]);
                matcher = regExGetCommands.matcher(pathInfo);
                if (matcher.find()) {
                    if (restCommands[i] != null) {
                        restCommands[i].execute(getServletContext(), request, response);
                    }
                    return;
                }
            }

        } finally {
            out.close();
        }
        try {
            response.sendError(409);
        } catch (IOException ex) {
            Logger.getLogger(process.class.getName()).log(Level.SEVERE, null, ex);
            response.setStatus(500);
        }
    }

    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request  servlet request
     * @param response servlet response
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) {
        try {
            processRequest(request, response);
        } catch (Exception ex) {
            Logger.getLogger(process.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request  servlet request
     * @param response servlet response
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) {
        try {
            processRequest(request, response);
        } catch (Exception ex) {
            Logger.getLogger(process.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Dieser Dienst dient der Behandlung aller /course und /link und /process Aufrufe fr OSTEPU";
    }

}