Quadcap Image Database

com/quadcap/app/dbimage/ActionLoad.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.io.File;
import java.io.IOException;

import java.sql.Connection;
import java.sql.SQLException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;

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

/**
 * Implementation of the 'load' action.  We load files into the database
 * from a directory specified in the request.  When we're done, we forward
 * to either the "error" or the "show" page.
 * 
 * @author Stan Bailes
 */
public class ActionLoad implements Action {
    ServletConfig                       config;

    /**
     * We've hard-coded the names of the result JSP pages; if we wanted
     * more flexibility, we could make these configuration parameters.
     */
    static final String         errorPage               = "/error.jsp";
    static final String         successPage             = "/show.jsp";
    
    public ActionLoad() {}

    public void init(ServletConfig config) {
        this.config = config;
    }

    public void service(HttpServletRequest request,
                        HttpServletResponse response)
        throws Exception
    {
        String root = request.getParameter("root");
        if (root == null || root.length() == 0) {
            request.setAttribute("error-message",
                                 "no 'root' parameter specified");
            forward(request, response, errorPage);
        } else {
            File f = new File(root);

            if (!f.exists()) {
                request.setAttribute("error-message",
                                     "Can't read: " + root);
                forward(request, response, errorPage);
                return;
            }
                    
            DbImageLoader loader = new DbImageLoader();
            try {
                Connection conn = getConnection();
                try {
                    loader.loadImages(conn, root);
                } finally {
                    conn.close();
                }
                forward(request, response, successPage);
            } catch (Throwable th) {
                request.setAttribute("exception", th);
                forward(request, response, errorPage);
            }
        }
    }

    public Connection getConnection() throws SQLException {
        ServletContext application = config.getServletContext();
        DbImageServlet s = (DbImageServlet)application.getAttribute("servlet");
        return s.getConnection();
    }

    public void forward(HttpServletRequest request,
                        HttpServletResponse response,
                        String page)
        throws ServletException, IOException
    {
        ServletContext context = config.getServletContext();
        RequestDispatcher rd = context.getRequestDispatcher(page);
        rd.forward(request, response);
    }
}