ForumManagerBean


1   /*
2    * ForumManagerBean.java
3    *
4    * Forum Manager bean represent functions for
5    * managing the forums
6    *
7    * @author: Devraj Mukherjee
8    *
9    * Created: 07th July 2001
10   *
11   */
12  
13   package freeforums.forum;
14  
15   import java.rmi.RemoteException  ;
16   import javax.ejb.*;
17   import javax.naming.*;
18   import javax.rmi.*;
19   import java.rmi.ServerException  ;
20   import java.util.Collection  ;
21   import java.util.Vector  ;
22  
23   import freeforums.util.AutoNumberHome;
24   import freeforums.util.AutoNumber;
25  
26   import freeforums.user.ForumUser;
27   import freeforums.user.ForumUserHome;
28   import freeforums.user.ForumUserPK;
29  
30   import org.jdom.*;
31   import java.util.List  ;
32  
33   public class ForumManagerBean implements SessionBean {
34  
35       /**
36       Helper function to get the home interface of a specified Bean. This is used by
37       most of the methods in this class.
38       */
39       private Object   getHome (String   path) {
40           try {
41               return (new InitialContext().lookup(path));
42           }
43          catch (NamingException e) {
44              System.err.println("An exception occured " + e);
45              return null;
46          }
47       }
48  
49       /**
50       Empty method body
51       */
52       public ForumManagerBean() {}
53       /**
54       Empty method body
55       */
56       public void ejbCreate() {}
57       /**
58       Empty method body
59       */
60       public void ejbRemove() {}
61       /**
62       Empty method body
63       */
64       public void ejbActivate() {}
65       /**
66       Empty method body
67       */
68       public void ejbPassivate() {}
69       /**
70       Empty method body
71       */
72       public void setSessionContext(SessionContext sc) {}
73  
74       public Document addForum(Document forumDetails) throws RemoteException   {
75  
76  
77           Element RootElement = forumDetails.getRootElement();
78  
79           List   forumListElement = RootElement.getChildren();
80           Element [] forumElements = (Element[])forumListElement.toArray(new Element[0]);
81  
82           String   forumName = forumElements[0].getChild("ForumName").getText();
83           String   forumDescription = forumElements[0].getChild("ForumDescription").getText();
84  
85           Element responseElement = new Element("Response");
86           String   identifier = "Forum";
87           Integer   id=null;
88  
89           try {
90  
91               /**
92                Process of creating AutoNumbers
93                **/
94               AutoNumberHome ANHome = (AutoNumberHome) getHome("java:comp/env/ejb/AutoNumber");
95               AutoNumber AutoNumberFactory = ANHome.findByPrimaryKey(identifier);
96               id = AutoNumberFactory.getAutoNumberValue();
97  
98           }
99           catch (Exception   e) {
100              /**
101               This Key was not found in the storage so
102               create a new one with this name
103               **/
104               try {
105                   AutoNumberHome ANHome = (AutoNumberHome) getHome("java:comp/env/ejb/AutoNumber");
106                   AutoNumber AutoNumberFactory = ANHome.create(identifier);
107                   id = AutoNumberFactory.getAutoNumberValue();
108               }
109               catch(Exception   exp) {
110                   /**
111                    Could not create this primary key
112                    **/
113                }
114 
115           }
116 
117           if (id==null) return (new Document(responseElement.addContent("Failed")));
118 
119           try {
120 
121               /**
122               Process of creating the Forum Object
123               **/
124 
125              ForumHome home = (ForumHome) getHome("java:comp/env/ejb/Forum");
126              Forum forum = home.create(id,forumName,forumDescription);
127              return (new Document(responseElement.addContent("Done")));
128 
129          }
130          catch(Exception   e) {
131              //do nothing
132              System.out.println("Exception occured while creating Forum \n" + e);
133              return (new Document(responseElement.addContent("Failed")));
134          }
135      }
136 
137      /*
138       * Modified version returns XML document description of Forum List
139       */
140 
141       public Document findAll() throws RemoteException  , FinderException {
142 
143           ForumHome home = (ForumHome) getHome("java:comp/env/ejb/Forum");
144           Collection   all = home.findAll();
145           Forum [] forumArray = (Forum[]) all.toArray(new Forum[0]);
146 
147           Element rootElement = new Element("ForumList");
148 
149           for(int counter=0; counter<forumArray.length; counter++) {
150 
151               Forum currentForum = forumArray[counter];
152 
153               Element ForumIDElement = new Element("ForumID").addContent((currentForum.getForumID()).toString());
154               Element ForumNameElement = new Element("ForumName").addContent(currentForum.getForumName());
155               Element ForumDescriptionElement = new Element("ForumDescription").addContent(currentForum.getForumDescription());
156 
157               Element ForumElement = new Element("Forum");
158               ForumElement.addContent(ForumIDElement);
159               ForumElement.addContent(ForumNameElement);
160               ForumElement.addContent(ForumDescriptionElement);
161 
162               rootElement.addContent(ForumElement);
163 
164           }
165 
166           return (new Document(rootElement));
167       }
168 
169       /*
170        * Find Forum method, finds a method given it's primary key
171        */
172 
173        public Document findForum(Document forumID) throws RemoteException  , FinderException {
174 
175            Integer   forumid = new Integer  (forumID.getRootElement().getText());
176 
177            try {
178                ForumHome home = (ForumHome) getHome("java:comp/env/ejb/Forum");
179                Forum currentForum = home.findByPrimaryKey(forumid);
180                Element ForumIDElement = new Element("ForumID").addContent((currentForum.getForumID()).toString());
181                Element ForumNameElement = new Element("ForumName").addContent(currentForum.getForumName());
182                Element ForumDescriptionElement = new Element("ForumDescription").addContent(currentForum.getForumDescription());
183                Element ForumElement = new Element("Forum");
184 
185                ForumElement.addContent(ForumIDElement);
186                ForumElement.addContent(ForumNameElement);
187                ForumElement.addContent(ForumDescriptionElement);
188 
189                return (new Document(ForumElement));
190            }
191            catch(Exception   e) {
192                return (new Document(new Element("Response").addContent("Failed")));
193            }
194        }
195 
196       /*
197        * Find Forum method, finds a method given it's primary key
198        */
199 
200        private Element findForumAsElement(Document forumID) throws RemoteException  , FinderException {
201 
202            Integer   forumid = new Integer  (forumID.getRootElement().getText());
203 
204            try {
205                ForumHome home = (ForumHome) getHome("java:comp/env/ejb/Forum");
206                Forum currentForum = home.findByPrimaryKey(forumid);
207                Element ForumIDElement = new Element("ForumID").addContent((currentForum.getForumID()).toString());
208                Element ForumNameElement = new Element("ForumName").addContent(currentForum.getForumName());
209                Element ForumDescriptionElement = new Element("ForumDescription").addContent(currentForum.getForumDescription());
210                Element ForumElement = new Element("Forum");
211 
212                ForumElement.addContent(ForumIDElement);
213                ForumElement.addContent(ForumNameElement);
214                ForumElement.addContent(ForumDescriptionElement);
215 
216                return (ForumElement);
217            }
218            catch(Exception   e) {
219                return (new Element("Response").addContent("Failed"));
220            }
221        }
222 
223        /*
224         * Returns an Array of Forum object for a given username
225         */
226 
227       public Document findForumsForUser(Document userDetails) throws RemoteException  , FinderException {
228 
229           Element RootElement = userDetails.getRootElement();
230           List   UserListElement = RootElement.getChildren();
231           Element [] UserElements = (Element[])UserListElement.toArray(new Element[0]);
232 
233           String   username = (UserElements[0].getChild("UserName").getText());
234           String   superuser = (UserElements[0].getChild("SuperUser").getText());
235 
236           boolean adminStatus = false;
237 
238           if(superuser.equals("Yes")) adminStatus = true;
239 
240           int ForumCounter = 0;
241 
242           Element rootElement = new Element("ForumList");
243 
244           try {
245               ForumUserHome home = (ForumUserHome) getHome("java:comp/env/ejb/ForumUser");
246               Collection   user_forums = home.findAll();
247               ForumUser[] user_forums_array = (ForumUser[]) user_forums.toArray(new ForumUser[0]);
248 
249               for(int counter=0; counter<user_forums_array.length; counter++) {
250                   if(user_forums_array[counter].getUserName().equals(username)) {
251                       Element tempForum = findForumAsElement(new Document(new Element("ForumID").addContent(user_forums_array[counter].getForumID().toString())));
252                       if(adminStatus==true) {
253                           if(user_forums_array[counter].isAdministrator()) {
254                               rootElement.addContent(tempForum);
255                               ForumCounter++;
256                           }
257 
258                       }
259                       else {
260                           rootElement.addContent(tempForum);
261                           ForumCounter++;
262                       }
263                   }
264               }
265 
266               System.out.println("Found " + ForumCounter + " forums for " + username);
267 
268               return (new Document(rootElement));
269           }
270           catch(Exception   e) {
271               //something happened on the way to heaven
272               System.out.println("Exception occurred while finding forums\n" + e);
273               return (new Document(new Element("Response").addContent("Failed")));
274           }
275 
276       }
277 
278       /*
279        * Is user allowed to use a particular forum
280        */
281 
282       public Document isUserAllowed(Document userDetails) throws RemoteException  , FinderException {
283 
284           Element rootElement = userDetails.getRootElement();
285 
286           Element responseElement = new Element("Response");
287 
288           String   username = rootElement.getChild("UserName").getText();
289           Integer   forumID = new Integer  ((rootElement.getChild("ForumID")).getText());
290 
291           try {
292               ForumUserHome home = (ForumUserHome) getHome("java:comp/env/ejb/ForumUser");
293               ForumUser isAllowed = home.findByPrimaryKey(new ForumUserPK(username, forumID));
294               if (isAllowed == null) responseElement.addContent("Failed");
295               else responseElement.addContent("Done");
296           }
297           catch(Exception   e) {
298               //something happened on the way to heaven
299               System.out.println("Exception occurred while finding forums\n" + e);
300               responseElement.addContent("Failed");
301           }
302 
303           return (new Document(responseElement));
304 
305       }
306 
307  } // end of class file
308
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