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1
15 package org.apache.tapestry.vlib.pages;
16
17 import java.rmi.RemoteException  ;
18 import java.util.List ;
19
20 import javax.ejb.FinderException ;
21
22 import org.apache.hivemind.ApplicationRuntimeException;
23 import org.apache.tapestry.IRequestCycle;
24 import org.apache.tapestry.PageRedirectException;
25 import org.apache.tapestry.Tapestry;
26 import org.apache.tapestry.event.PageEvent;
27 import org.apache.tapestry.event.PageRenderListener;
28 import org.apache.tapestry.form.IPropertySelectionModel;
29 import org.apache.tapestry.vlib.EntitySelectionModel;
30 import org.apache.tapestry.vlib.IActivate;
31 import org.apache.tapestry.vlib.Protected;
32 import org.apache.tapestry.vlib.VirtualLibraryEngine;
33 import org.apache.tapestry.vlib.Visit;
34 import org.apache.tapestry.vlib.ejb.Book;
35 import org.apache.tapestry.vlib.ejb.IBookQuery;
36 import org.apache.tapestry.vlib.ejb.IOperations;
37 import org.apache.tapestry.vlib.ejb.Person;
38
39
47
48 public abstract class GiveAwayBooks extends Protected implements PageRenderListener
49 {
50 public abstract IPropertySelectionModel getBooksModel();
51
52 public abstract void setBooksModel(IPropertySelectionModel booksModel);
53
54 public abstract IPropertySelectionModel getPersonModel();
55
56 public abstract void setPersonModel(IPropertySelectionModel personModel);
57
58 public abstract List getSelectedBooks();
59
60 public abstract Integer getTargetUserId();
61
62 public void formSubmit(IRequestCycle cycle)
63 {
64 VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
65
66 Integer targetUserId = getTargetUserId();
67
68 Person target = vengine.readPerson(targetUserId);
69
70 List selectedBooks = getSelectedBooks();
71
72 int count = Tapestry.size(selectedBooks);
73
74 if (count == 0)
75 {
76 setError(format("select-at-least-one-book", target.getNaturalName()));
77 return;
78 }
79
80 Integer [] bookIds = (Integer []) selectedBooks.toArray(new Integer [count]);
81
82 int i = 0;
83 while (true)
84 {
85 IOperations operations = vengine.getOperations();
86
87 try
88 {
89 operations.transferBooks(targetUserId, bookIds);
90
91 break;
92 }
93 catch (FinderException ex)
94 {
95 throw new ApplicationRuntimeException(ex);
96 }
97 catch (RemoteException ex)
98 {
99 vengine.rmiFailure(getMessage("update-failure"), ex, i++);
100 }
101 }
102
103 MyLibrary myLibrary = (MyLibrary) cycle.getPage("MyLibrary");
104
105 myLibrary.setMessage(
106 format("transfered-books", Integer.toString(count), target.getNaturalName()));
107
108 myLibrary.activate(cycle);
109 }
110
111 private IPropertySelectionModel buildPersonModel()
112 {
113 VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
114 Visit visit = (Visit) vengine.getVisit();
115 Integer userPK = visit.getUserId();
116
117 Person[] persons = null;
118
119 int i = 0;
120 while (true)
121 {
122 IOperations operations = vengine.getOperations();
123
124 try
125 {
126 persons = operations.getPersons();
127
128 break;
129 }
130 catch (RemoteException ex)
131 {
132 vengine.rmiFailure(getMessage("read-users-failure"), ex, i++);
133 }
134 }
135
136 EntitySelectionModel result = new EntitySelectionModel();
137
138 for (i = 0; i < persons.length; i++)
139 {
140
141 Person p = persons[i];
142 Integer pk = p.getId();
143
144 if (pk.equals(userPK))
145 continue;
146
147 result.add(pk, p.getNaturalName());
148 }
149
150 return result;
151 }
152
153 public void pageBeginRender(PageEvent event)
154 {
155 IPropertySelectionModel model = getBooksModel();
156
157 if (model == null)
158 {
159 model = buildBooksModel();
160 setBooksModel(model);
161 }
162
163 model = getPersonModel();
164 if (model == null)
165 {
166 model = buildPersonModel();
167 setPersonModel(model);
168 }
169 }
170
171 private IPropertySelectionModel buildBooksModel()
172 {
173 VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
174 Visit visit = (Visit) vengine.getVisit();
175 Integer userPK = visit.getUserId();
176 Book[] books = null;
177
178 int i = 0;
179 while (true)
180 {
181 books = null;
182
183 try
184 {
185 IBookQuery query = vengine.createNewQuery();
186
187 int count = query.ownerQuery(userPK, null);
188
189 if (count > 0)
190 books = query.get(0, count);
191
192 break;
193 }
194 catch (RemoteException ex)
195 {
196 vengine.rmiFailure(getMessage("read-books-failure"), ex, i++);
197 }
198 }
199
200 EntitySelectionModel result = new EntitySelectionModel();
201
202 if (books != null)
203 for (i = 0; i < books.length; i++)
204 result.add(books[i].getId(), books[i].getTitle());
205
206 return result;
207
208 }
209
210 public void pageValidate(PageEvent event)
211 {
212 super.pageValidate(event);
213
214 IPropertySelectionModel model = buildBooksModel();
215
216 if (model.getOptionCount() == 0)
217 {
218 IRequestCycle cycle = getRequestCycle();
219 IActivate page = (IActivate) cycle.getPage("MyLibrary");
220
221 page.activate(cycle);
222
223 throw new PageRedirectException(page);
224 }
225
226 setBooksModel(model);
227 }
228
229 }
230 |
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