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Java > Open Source Codes > com > sun > j2ee > blueprints > docoriented > client > FrontController


1 /* Copyright 2005 Sun Microsystems, Inc. All rights reserved. You may not modify, use, reproduce, or distribute this software except in compliance with the terms of the License at:
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3  http://developer.sun.com/berkeley_license.html
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5  $Id: FrontController.java,v 1.15 2005/05/31 23:29:56 sean_brydon Exp $ */
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7
8
9 package com.sun.j2ee.blueprints.docoriented.client;
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11
12
13 import java.io.*;
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15 import java.util.*;
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17 import javax.servlet.*;
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19 import javax.servlet.http.*;
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21
22
23 /**
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25  * Centralized controller for all the
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27  * incoming requests
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29  */
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31 public class FrontController extends HttpServlet {
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33     
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35     private Map nameSpace;
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37     private RequestHandler handler;
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39
40
41     public void init() {
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43         initPathMapping();
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45         handler = new RequestHandler();
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47     }
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49
50
51     public void doPost(HttpServletRequest req, HttpServletResponse resp) throws
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53         IOException, ServletException {
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55         doGet(req, resp);
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57     }
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59
60
61     public void doGet(HttpServletRequest req, HttpServletResponse resp) throws
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63         IOException, ServletException{
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65         process(req, resp);
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67     }
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69
70
71     protected void process(HttpServletRequest req, HttpServletResponse resp) throws
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73                            IOException, ServletException {
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75         resp.setContentType("text/html");
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77         String JavaDoc responseURL = null;
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79         String JavaDoc fullURL = req.getRequestURI();
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81
82
83         // get the screen name
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85         String JavaDoc selectedURL = null;
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87         int lastPathSeparator = fullURL.lastIndexOf("/") + 1;
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89         if (lastPathSeparator != -1) {
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91             selectedURL = fullURL.substring(lastPathSeparator, fullURL.length());
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93         }
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95         responseURL = getResponseURL(selectedURL);
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97         
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99         if (selectedURL.equals("invokeservice.do")) {
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101             try {
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103                 handler.handle(req,resp);
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105             } catch (RequestHandlerException re) {
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107                 req.setAttribute("error_message", re.getMessage());
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109                 responseURL = getResponseURL("error.do");
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111             }
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113         }
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115         getServletConfig().getServletContext()
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117                 .getRequestDispatcher(responseURL).forward(req, resp);
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119     }
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121
122
123     protected String JavaDoc getResponseURL(String JavaDoc url) {
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125         return (String JavaDoc) nameSpace.get(url);
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127     }
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129                                                           
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131     protected void initPathMapping() {
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133         nameSpace = new HashMap();
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135         nameSpace.put("invokeservice.do", "/result.jsp");
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137         nameSpace.put("index.do", "/index.jsp");
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139         nameSpace.put("error.do", "/error.jsp");
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141     }
142
143 }
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