Metacat

/**

 *  '$RCSfile$'

 *  Copyright: 2000 Regents of the University of California and the

 *              National Center for Ecological Analysis and Synthesis

 *

 *   '$Author: Serhan AKIN $'

 *     '$Date: 2009-06-13 13:28:21 +0300  $'

 *

 * 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.restservice;

import java.io.IOException;

import javax.servlet.ServletConfig;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;

/**

 * Metacat implemantation of Earthgrid (Ecogrid) REST API as a servlet. In each request

 * REST Servlet initialize a D1ResourceHandler object and then D1ResourceHandler object 

 * handles with request and writes approriate response. 

 *  

 */

public class D1RestServlet extends HttpServlet {

    protected Logger logMetacat;

    protected D1ResourceHandler handler;

    /**

     * Subclasses should override this method to provide the appropriate handler subclass

     * @param request

     * @param response

     * @return

     * @throws ServletException

     * @throws IOException

     */

    protected D1ResourceHandler createHandler(HttpServletRequest request, HttpServletResponse response) 

		throws ServletException, IOException {

	    D1ResourceHandler handler = new D1ResourceHandler(getServletContext(), request, response);

	    return handler;

	}

    /**

     * Initalize servlet by setting logger

     */

    @Override

    public void init(ServletConfig config) throws ServletException {

        logMetacat = Logger.getLogger(this.getClass());

        super.init(config);

    }

    /** Handle "GET" method requests from HTTP clients */

    @Override

    protected void doGet(HttpServletRequest request,

            HttpServletResponse response) throws ServletException, IOException {

        System.out.println("HTTP Verb: GET");

        handler = createHandler(request, response);

        handler.handle(D1ResourceHandler.GET);

    }

    /** Handle "POST" method requests from HTTP clients */

    @Override

    protected void doPost(HttpServletRequest request,

            HttpServletResponse response) throws ServletException, IOException {

        System.out.println("HTTP Verb: POST");

        handler = createHandler(request, response);

        handler.handle(D1ResourceHandler.POST);

    }

    /** Handle "DELETE" method requests from HTTP clients */

    @Override

    protected void doDelete(HttpServletRequest request,

            HttpServletResponse response) throws ServletException, IOException {

        System.out.println("HTTP Verb: DELETE");

        handler = createHandler(request, response);

        handler.handle(D1ResourceHandler.DELETE);

    }

    /** Handle "PUT" method requests from HTTP clients */

    @Override

    protected void doPut(HttpServletRequest request,

            HttpServletResponse response) throws ServletException, IOException {

        System.out.println("HTTP Verb: PUT");

        handler = createHandler(request, response);

        handler.handle(D1ResourceHandler.PUT);

    }

    /** Handle "PUT" method requests from HTTP clients */

    @Override

    protected void doHead(HttpServletRequest request,

            HttpServletResponse response) throws ServletException, IOException {

        System.out.println("HTTP Verb: HEAD");

        handler = createHandler(request, response);

        handler.handle(D1ResourceHandler.HEAD);

    }

}