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Java > Open Source Codes > org > apache > ojb > odmg > states > StateNewDelete


1 package org.apache.ojb.odmg.states;
2
3 /* Copyright 2002-2005 The Apache Software Foundation
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 import org.apache.ojb.odmg.ObjectEnvelope;
19
20 /**
21  * this state represents new objects which have been mrked for deletion during tx.
22  */
23 public class StateNewDelete extends ModificationState
24 {
25     private static StateNewDelete _instance = new StateNewDelete();
26
27     /**
28      * return resulting state after marking clean
29      */
30     public ModificationState markClean()
31     {
32         return StateNewClean.getInstance();
33     }
34
35     /**
36      * return resulting state after marking delete
37      */
38     public ModificationState markDelete()
39     {
40         return this;
41     }
42
43     /**
44      * return resulting state after marking dirty
45      */
46     public ModificationState markDirty()
47     {
48         return this;
49     }
50
51     /**
52      * return resulting state after marking new
53      */
54     public ModificationState markNew()
55     {
56         return StateNewDirty.getInstance();
57     }
58
59     /**
60      * return resulting state after marking old
61      */
62     public ModificationState markOld()
63     {
64         return StateOldDelete.getInstance();
65     }
66
67     /**
68      * returns true is this state requires DELETE
69      * @return boolean
70      */
71     public boolean needsDelete()
72     {
73         return true;
74     }
75
76     /**
77      * private constructor: use singleton instance
78      */
79     private StateNewDelete()
80     {
81     }
82
83     /**
84      * perform a checkpoint, i.e. perform updates on underlying db but keep locks on objects
85      */
86     public static StateNewDelete getInstance()
87     {
88         return _instance;
89     }
90
91     /**
92      * rollback the ObjectModification
93      */
94     public void checkpoint(ObjectEnvelope mod)
95     {
96     }
97
98     /**
99      * commit ObjectModification
100      */
101     public void commit(ObjectEnvelope mod)
102     {
103         mod.doEvictFromCache();
104         mod.setModificationState(StateTransient.getInstance());
105     }
106
107     /**
108      *
109      */
110     public void rollback(ObjectEnvelope mod)
111     {
112         mod.doEvictFromCache();
113         mod.setModificationState(StateTransient.getInstance());
114     }
115 }
116
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