MessageController


1   /*
2    * MessageController.java
3    *
4    * JavaBean to allow the JSP pages to perform the right
5    * user functions.
6    *
7    * @author: Devraj Mukherjee
8    *
9    * Includes XML Support
10   *
11   */
12  
13  package freeforums.jspbeans;
14  
15  import javax.naming.*;
16  import java.util.Hashtable  ;
17  import javax.rmi.PortableRemoteObject  ;
18  import java.util.Properties  ;
19  import java.io.FileInputStream  ;
20  import java.util.Properties  ;
21  import java.util.Date  ;
22  
23  import java.util.List  ;
24  
25  import freeforums.message.*;
26  import freeforums.user.*;
27  
28  import org.jdom.*;
29  
30  public class MessageController extends Object   {
31  
32      public MessageController() { }
33  
34      /** Bridge method to addMessage **/
35  
36      public Document addMessageToForum(Document ForumDetails) {
37  
38          try {
39              //Get the home interface for the user management bean
40              MessageManagerHome home = (MessageManagerHome) new InitialContext().lookup("MessageManagerBean");
41              // Create the manager object
42              MessageManager manager = home.create();
43              return manager.addMessage(ForumDetails);
44          }
45          catch(Exception   e) {
46              // do nothing much
47              return (new Document(new Element("Response").addContent("Failed")));
48          }
49  
50      }
51  
52      public Document markReadMessage(Document MessageDetails) {
53  
54          try {
55              //Get the home interface for the user management bean
56              MessageManagerHome home = (MessageManagerHome) new InitialContext().lookup("MessageManagerBean");
57              // Create the manager object
58              MessageManager manager = home.create();
59              return manager.markReadMessage(MessageDetails);
60          }
61          catch(Exception   e) {
62              // do nothing much
63              return (new Document(new Element("Response").addContent("Failed")));
64          }
65  
66      }
67  
68      public Document isReadMessage(Document MessageDetails) {
69  
70          try {
71              //Get the home interface for the user management bean
72              MessageManagerHome home = (MessageManagerHome) new InitialContext().lookup("MessageManagerBean");
73              // Create the manager object
74              MessageManager manager = home.create();
75              return manager.isReadMessage(MessageDetails);
76          }
77          catch(Exception   e) {
78              // do nothing much
79              return (new Document(new Element("Response").addContent("Failed")));
80          }
81  
82      }
83  
84      public Document getMessage(Document MessageDetails) {
85  
86          try {
87              //Get the home interface for the user management bean
88              MessageManagerHome home = (MessageManagerHome) new InitialContext().lookup("MessageManagerBean");
89              // Create the manager object
90              MessageManager manager = home.create();
91              return manager.getMessage(MessageDetails);
92          }
93          catch(Exception   e) {
94              // do nothing much
95              return (new Document(new Element("Response").addContent("Failed")));
96          }
97  
98      }
99  
100     //////////////////////////////////////////////////////////////////////////////////////////////////
101     //
102     //
103     // The following part of this program is the complex code that produces the threaded list of
104     // messages. The code has been adopted from the previous versions of the same project.
105     //
106     //
107     //////////////////////////////////////////////////////////////////////////////////////////////////
108 
109     private int depth;
110 
111     /**
112      *
113      * Given a Parent Message ID this will count the number of submessages
114      *
115      **/
116 
117     private int countSubMessages(Element MessageElement, Document MessageList) {
118 
119         String   ParentMessageID = MessageElement.getChild("MessageID").getText();
120 
121         List   MessageListElement = MessageList.getRootElement().getChildren();
122         Element [] MessageElements = (Element[])MessageListElement.toArray(new Element[0]);
123 
124         try {
125             int countMessages=0;
126             for(int cntr=0; cntr<MessageElements.length; cntr++)
127             if(MessageElements[cntr].getChild("ReplyToID").getText().equals(ParentMessageID)) countMessages++;
128             return countMessages;
129         }
130         catch(Exception   e) {
131             System.out.println("countSubMessage() failed\n" +e);
132             return 0;
133         }
134 
135     }
136 
137     /**
138      *
139      * Given a Message Element this method will format it as HTML and return the Element
140      *
141      * This is done so that no web specific output is generated in the Entity or Session Beans
142      *
143      * This Class is a web specific class so we can generate some HTML here.
144      *
145      **/
146 
147      private Element formatMessage(Element MessageElement, String   UserName) {
148 
149          Element RowElement = new Element("tr");
150 
151          String   MessageID   = MessageElement.getChild("MessageID").getText();
152          String   Subject     = MessageElement.getChild("Subject").getText();
153          String   Author      = MessageElement.getChild("UserName").getText();
154          String   MessageDate = MessageElement.getChild("MessageDate").getText();
155          String   ForumID     = MessageElement.getChild("ForumID").getText();
156 
157          // Check if message is read
158 
159          Element ReadMessageStatus = new Element("ReadMessage");
160          ReadMessageStatus.addContent(new Element("UserName").addContent(UserName));
161          ReadMessageStatus.addContent(new Element("MessageID").addContent(MessageID));
162 
163          Document ReadStatusResult = isReadMessage(new Document(ReadMessageStatus));
164 
165          // Make HTML tags
166 
167          RowElement.addContent(new Element("td").addContent(MessageDate));
168 
169          Element ReadMessage = new Element("A");
170          ReadMessage.addAttribute("HREF","read_message.jsp?message_id=" + MessageID + "&forum_id=" + ForumID);
171          ReadMessage.addContent(Subject);
172 
173          Element ImageTag = new Element("IMG");
174          ImageTag.addAttribute("SRC","../images/spacer.gif");
175          ImageTag.addAttribute("WIDTH",""+depth);
176          ImageTag.addAttribute("HEIGHT","1");
177 
178          Element SubjectCol = new Element("td");
179          SubjectCol.addContent(ImageTag);
180 
181          if(ReadStatusResult.getRootElement().getText().equals("UnRead")) {
182 
183              Element Bold = new Element("B");
184              Bold.addContent(ReadMessage);
185              SubjectCol.addContent(Bold);
186 
187          }
188          else SubjectCol.addContent(ReadMessage);
189 
190          RowElement.addContent(SubjectCol);
191 
192          RowElement.addContent(new Element("td").addContent(Author));
193 
194          Element PostMessage = new Element("A");
195          PostMessage.addAttribute("HREF","post_message.jsp?reply_to=" + MessageID + "&forum_id=" + ForumID);
196          PostMessage.addContent("Reply");
197 
198          RowElement.addContent(new Element("td").addContent(PostMessage));
199 
200          return RowElement;
201 
202      }
203 
204     /**
205      *
206      * Parent method to generate the HTML
207      *
208      **/
209 
210     public Document getMessagesForForum(Document ForumUserDetails) {
211 
212         Element MessageTableElement = new Element("table");
213         MessageTableElement.addAttribute("width","100%");
214         MessageTableElement.addAttribute("cellpadding","0");
215         MessageTableElement.addAttribute("cellspacing","0");
216 
217         Element HeaderRow = new Element("tr");
218         HeaderRow.addAttribute("bgcolor","#FFFFCC");
219 
220         Element Column1 = new Element("td");
221         Column1.addAttribute("width","10%");
222         Column1.addContent("Date");
223         HeaderRow.addContent(Column1);
224 
225         Element Column2 = new Element("td");
226         Column2.addContent("Subject");
227         HeaderRow.addContent(Column2);
228 
229         Element Column3 = new Element("td");
230         Column3.addAttribute("width","10%");
231         Column3.addContent("Author");
232         HeaderRow.addContent(Column3);
233 
234         Element Column4 = new Element("td");
235         Column4.addAttribute("width","10%");
236         Column4.addContent("Reply");
237         HeaderRow.addContent(Column4);
238 
239         MessageTableElement.addContent(HeaderRow);
240 
241         String   ForumID  = ForumUserDetails.getRootElement().getChild("ForumID").getText();
242         String   UserName = ForumUserDetails.getRootElement().getChild("UserName").getText();
243 
244         try {
245             //Get the home interface for the user management bean
246             MessageManagerHome home = (MessageManagerHome) new InitialContext().lookup("MessageManagerBean");
247             // Create the manager object
248             MessageManager manager = home.create();
249             //Get the array
250             Document MessageListDocument = manager.findMessagesForForum(new Document(new Element("ForumID").addContent(ForumID)));
251 
252             List   MessageListElement = MessageListDocument.getRootElement().getChildren();
253             Element [] MessageElements = (Element[])MessageListElement.toArray(new Element[0]);
254 
255             for(int cntr=0; cntr<MessageElements.length; cntr++) {
256                 Element currentMessage = MessageElements[cntr];
257                 if(currentMessage.getChild("ReplyToID").getText().equals("-1")) {
258                     depth=0;
259                     MessageTableElement.addContent(formatMessage(currentMessage, UserName));
260                     listSubMessages(MessageTableElement,MessageListDocument,currentMessage.getChild("MessageID").getText(),UserName);
261                 }
262             }
263 
264             return (new Document(MessageTableElement));
265         }
266         catch(Exception   e) {
267             //something went wrong while making the HTML
268             //quite unlikely that we would get this exception
269             System.out.println("getMessageForForum failed \n" + e);
270             return (new Document(new Element("Response").addContent("Failed")));
271         }
272 
273     } // end method
274 
275     /**
276      *
277      * Converts the messages to HTML format
278      * This method is a helper method
279      *
280      **/
281 
282     private void listSubMessages(Element MessageTableElement, Document MessageListDocument, String   ParentMessageID, String   UserName) {
283 
284         List   MessageListElement = MessageListDocument.getRootElement().getChildren();
285         Element [] MessageElements = (Element[])MessageListElement.toArray(new Element[0]);
286 
287         try {
288             Element currentMessage=null;
289             int countMessages=0,messageIndex=0;
290             depth+=8;
291 
292             for(int cntr=0; cntr<MessageElements.length; cntr++) {
293                 currentMessage = MessageElements[cntr];
294                 if(currentMessage.getChild("ReplyToID").getText().equals(ParentMessageID)) {
295                     countMessages++;
296                     messageIndex=cntr;
297                 }
298             }
299 
300             if (countMessages==0) return;
301             if (countMessages==1) {
302                 currentMessage=MessageElements[messageIndex];
303                 MessageTableElement.addContent(formatMessage(currentMessage,UserName));
304                 if(countSubMessages(currentMessage, MessageListDocument)>0) listSubMessages(MessageTableElement, MessageListDocument, currentMessage.getChild("MessageID").getText(), UserName);
305                 depth-=8;
306                 return;
307             }
308             ///////////////////////////////////
309             // If more than one message then //
310             ///////////////////////////////////
311             for(int cntr=0; cntr<MessageElements.length; cntr++) {
312                 currentMessage=MessageElements[cntr];
313                 if(currentMessage.getChild("ReplyToID").getText().equals(ParentMessageID)) {
314                     MessageTableElement.addContent(formatMessage(currentMessage,UserName));
315                     // List sub messages for this reply message
316                     if(countSubMessages(currentMessage, MessageListDocument)>0)
317                     listSubMessages(MessageTableElement, MessageListDocument, currentMessage.getChild("MessageID").getText(), UserName);
318                 }
319             }
320             ///////////////////////////////
321             // End more than one message //
322             ///////////////////////////////
323             depth-=8;
324             return;
325         }
326         catch(Exception   e) {
327             //Something wrong happened above, quite unlikely.
328             System.out.println("listSubMessages() failed \n " + e);
329             return;
330         }
331     }
332 
333 } // end class file
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