Quadcap Image Database

com/quadcap/app/dbimage/DbImageController.java

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package com.quadcap.app.dbimage;

/* Copyright 2000 - 2003 Quadcap Software.  All rights reserved.
 *
 * This software is distributed under the Quadcap Free Software License.
 * This software may be used or modified for any purpose, personal or
 * commercial.  Open Source redistributions are permitted.  Commercial
 * redistribution of larger works derived from, or works which bundle
 * this software requires a "Commercial Redistribution License"; see
 * http://www.quadcap.com/purchase.
 *
 * Redistributions qualify as "Open Source" under  one of the following terms:
 *   
 *    Redistributions are made at no charge beyond the reasonable cost of
 *    materials and delivery.
 *
 *    Redistributions are accompanied by a copy of the Source Code or by an
 *    irrevocable offer to provide a copy of the Source Code for up to three
 *    years at the cost of materials and delivery.  Such redistributions
 *    must allow further use, modification, and redistribution of the Source
 *    Code under substantially the same terms as this license.
 *
 * Redistributions of source code must retain the copyright notices as they
 * appear in each source code file, these license terms, and the
 * disclaimer/limitation of liability set forth as paragraph 6 below.
 *
 * Redistributions in binary form must reproduce this Copyright Notice,
 * these license terms, and the disclaimer/limitation of liability set
 * forth as paragraph 6 below, in the documentation and/or other materials
 * provided with the distribution.
 *
 * The Software is provided on an "AS IS" basis.  No warranty is
 * provided that the Software is free of defects, or fit for a
 * particular purpose.  
 *
 * Limitation of Liability. Quadcap Software shall not be liable
 * for any damages suffered by the Licensee or any third party resulting
 * from use of the Software.
 */

import java.util.HashMap;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * The controller servlet for the image database application.  All incoming
 * requests get dispatched from here to an Action instance.
 *
 * @author Stan Bailes
 */
public class DbImageController extends HttpServlet {
    HashMap                     actions = new HashMap();

    static HashMap              actionClasses = new HashMap();
    static {
        actionClasses.put("/load", "com.quadcap.app.dbimage.ActionLoad");
    }
    
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        
    }

    public void doPost(HttpServletRequest request,
                      HttpServletResponse response)
        throws ServletException
    {
        doGet(request, response);
    }
    
    public void doGet(HttpServletRequest request,
                      HttpServletResponse response)
        throws ServletException
    {
        try {
            Action action = getAction(request);
            if (action == null) {
                response.sendError(HttpServletResponse.SC_NOT_FOUND, 
                                   "Not Found");
            } else {
                try {
                    action.service(request, response);
                } catch (ServletException e) {
                    throw e;
                }
            }
        } catch (Throwable t) {
            throw new ServletException(t);
        }
    }

    Action getAction(HttpServletRequest request) throws Exception {
        String s = request.getPathInfo();
        Action action = (Action)actions.get(s);
        if (action == null) {
            String actionClass = (String)actionClasses.get(s);
            if (actionClass != null) {
                Class c = Class.forName(actionClass);
                action = (Action)c.newInstance();
                action.init(getServletConfig());
                actions.put(s, action);
            }
        }
        return action;
    }
}