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


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 not been altered during tx.
22  */
23 public class StateNewClean extends ModificationState
24 {
25     private static StateNewClean _instance = new StateNewClean();
26
27     /**
28      * private constructor: we use singleton instances
29      */
30     private StateNewClean()
31     {
32     }
33
34     /**
35      * perform a checkpoint, i.e. perform updates on underlying db but keep locks on objects
36      */
37     public static StateNewClean getInstance()
38     {
39         return _instance;
40     }
41
42     /**
43      * return resulting state after marking clean
44      */
45     public ModificationState markClean()
46     {
47         return this;
48     }
49
50     /**
51      * return resulting state after marking delete
52      */
53     public ModificationState markDelete()
54     {
55         return StateNewDelete.getInstance();
56     }
57
58     /**
59      * return resulting state after marking dirty
60      */
61     public ModificationState markDirty()
62     {
63         return StateNewDirty.getInstance();
64     }
65
66     /**
67      * return resulting state after marking new
68      */
69     public ModificationState markNew()
70     {
71         return this;
72     }
73
74     /**
75      * return resulting state after marking old
76      */
77     public ModificationState markOld()
78     {
79         return StateOldClean.getInstance();
80     }
81
82     /**
83      * object is new, thus we need an INSERT to store it
84      */
85     public boolean needsInsert()
86     {
87         return true;
88     }
89
90     /**
91      * checkpoint the transaction
92      */
93     public void checkpoint(ObjectEnvelope mod)
94             throws org.apache.ojb.broker.PersistenceBrokerException
95     {
96         mod.doInsert();
97         mod.setModificationState(StateOldClean.getInstance());
98     }
99
100
101     /**
102      * commit the associated transaction
103      */
104     public void commit(ObjectEnvelope mod) throws org.apache.ojb.broker.PersistenceBrokerException
105     {
106         mod.doInsert();
107         mod.setModificationState(StateOldClean.getInstance());
108     }
109
110     /**
111      * rollback the transaction
112      */
113     public void rollback(ObjectEnvelope mod)
114     {
115         mod.doEvictFromCache();
116     }
117 }
118
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