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Java > Open Source Codes > org > apache > tapestry > contrib > table > components > TableViewSessionStateManager


1 // Copyright 2004, 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.contrib.table.components;
16
17 import java.io.Serializable JavaDoc;
18
19 import org.apache.tapestry.contrib.table.model.ITableModel;
20 import org.apache.tapestry.contrib.table.model.ITableSessionStateManager;
21 import org.apache.tapestry.contrib.table.model.simple.SimpleTableState;
22
23 /**
24  * Acts like {@link org.apache.tapestry.contrib.table.model.common.FullTableSessionStateManager}
25  * if the model is provided via the tableModel parameter;
26  * saves only the model state otherwise.
27  *
28  * @author mindbridge
29  */
30 public class TableViewSessionStateManager implements ITableSessionStateManager
31 {
32     private TableView m_objView;
33
34     public TableViewSessionStateManager(TableView objView)
35     {
36         m_objView = objView;
37     }
38     
39     /**
40      * @see org.apache.tapestry.contrib.table.model.ITableSessionStateManager#getSessionState(org.apache.tapestry.contrib.table.model.ITableModel)
41      */
42     public Serializable JavaDoc getSessionState(ITableModel objModel)
43     {
44         // if the model is provided using the 'tableModel' parameter,
45 // emulate FullTableSessionStateManager and save everything
46 // (backward compatibility)
47 if (m_objView.getCachedTableModelValue() != null)
48             return (Serializable JavaDoc) objModel;
49             
50         // otherwise save only the state
51 return new SimpleTableState(objModel.getPagingState(), objModel.getSortingState());
52     }
53
54     /**
55      * @see org.apache.tapestry.contrib.table.model.ITableSessionStateManager#recreateTableModel(java.io.Serializable)
56      */
57     public ITableModel recreateTableModel(Serializable JavaDoc objState)
58     {
59         // if the state implements ITableModel, return itself
60 // (backward compatibility)
61 if (objState instanceof ITableModel)
62             return (ITableModel) objState;
63             
64         // otherwise have the component re-generate the model using the provided state
65 return m_objView.generateTableModel((SimpleTableState) objState);
66     }
67
68 }
69
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