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/Users/lyon/j4p/src/net/server/servlets/FormProcessorServlet.java
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1 package net.server.servlets;
2
3 import javax.servlet.ServletException;
4 import javax.servlet.http.HttpServlet;
5 import javax.servlet.http.HttpServletRequest;
6 import javax.servlet.http.HttpServletResponse;
7 import java.io.IOException;
8 import java.io.PrintWriter;
9 import java.util.ResourceBundle;
10
11 /**
12 * The FormProcessorServlet class handles the processing of
13 * the HTML pages which prompt the user for input for the Form
14 * C student evaluation form.
15 *
16 * @author Robert Lysik
17 * @version 1.00
18 */
19
20 public class FormProcessorServlet extends HttpServlet {
21
22 ResourceBundle rb = ResourceBundle.getBundle("LocalStrings");
23
24 private CourseDataFileReader reader; // Information read in from
25 // CSV file
26
27 public FormProcessorServlet() {
28 reader = new CourseDataFileReader();
29 }
30
31 /**
32 * This method handles the coordination of HTML page
33 * display and form processing using parameters
34 * extracted from the request object which is passed in
35 * as a parameter. The value of the status parameter determines
36 * which HTML page to display next.
37 *
38 * The initial state, where status is null, involves display of
39 * a user vealidation form which prompts the user for their
40 * user id and password.
41 *
42 * If the user is authorized, they are then prompted for the
43 * course and section for which they wish to enter data for Form C.
44 *
45 * The Form C page is then displayed allowing the user to enter the
46 * student assessment values for each category and student in the class.
47 *
48 * A confirmation page is then displayed to the user, following which, the
49 * data is either written to file, or written to a database.
50 *
51 */
52 public void doGet(HttpServletRequest request,
53 HttpServletResponse response)
54 throws IOException, ServletException {
55 response.setContentType("text/html");
56 PrintWriter out = response.getWriter();
57 String pageStatus = request.getParameter("status");
58
59 // First entry into doGet method, display user authorization form.
60 if (pageStatus == null) {
61 UserAuthorizationPage page = new UserAuthorizationPage();
62
63 out.println(page.getHtml());
64 }
65
66 // Once the course has been selected, the user may then select
67 // the section number for the course
68 else if (pageStatus.equals("course_id_selected")) {
69 String courseId = request.getParameter("course");
70
71 SelectSectionPage page =
72 new SelectSectionPage(courseId,
73 reader.getSectionIds(courseId));
74
75 out.println(page.getHtml());
76 }
77
78 // Using the course number and section number obtained during the
79 // preceding steps, display the Form C student evaluation form.
80 else if (pageStatus.equals("section_id_selected")) {
81 String courseId = request.getParameter("course");
82 String sectionId = request.getParameter("section");
83
84 ReviewForm page = new ReviewForm(courseId,
85 sectionId,
86 reader.getCourse(courseId, sectionId),
87 reader.getCourseStudents(courseId, sectionId));
88
89 out.println(page.getHtml());
90 }
91
92 // Re-display the information submitted from Form C
93 else if (pageStatus.equals("evaluation_complete")) {
94 ConfirmationPage page = new ConfirmationPage(request);
95
96 out.println(page.getHtml());
97 }
98
99 // Finally, save the data generated during the form C evaluation
100 else if (pageStatus.equals("confirmed")) {
101 SqlSynthesizer synthesizer = new SqlSynthesizer(request);
102
103 synthesizer.save("c:\\statements.sql");
104 }
105 }
106
107 /**
108 * This method handles the coordination of HTML page
109 * display and form processing using parameters
110 * extracted from the request object which is passed in
111 * as a parameter. The value of the status parameter determines
112 * which HTML page to display next. The doPost method is used
113 * for processing of the users id an password information
114 *
115 * The initial state, where status is null, involves display of
116 * a user validation form which prompts the user for their
117 * user id and password.
118 *
119 * If the user is authorized, they are then prompted for the
120 * course and section for which they wish to enter data for Form C.
121 *
122 */
123 public void doPost(HttpServletRequest request,
124 HttpServletResponse response)
125 throws IOException, ServletException {
126 response.setContentType("text/html");
127 PrintWriter out = response.getWriter();
128 String pageStatus = request.getParameter("status");
129
130 if (pageStatus.equals("authorizing")) {
131 String userId = request.getParameter("txtUserId");
132 String password = request.getParameter("txtPassword");
133 boolean userIsAuthorized = false;
134
135 Authorization userAuthorization = new Authorization();
136 userIsAuthorized = userAuthorization.verify(userId, password);
137
138 if (!userIsAuthorized)
139 out.println("<html><body>You are not authorized for access.</body></html>");
140
141 // If user is authorized to continue, display the select course
142 // page
143 else {
144 SelectCoursePage page =
145 new SelectCoursePage(reader.getCourseIds(),
146 reader.getCourses());
147
148 out.println(page.getHtml());
149 }
150 }
151 }
152 }
153
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156