KickJava   Java API By Example, From Geeks To Geeks.

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


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 import org.apache.ojb.broker.PersistenceBrokerException;
20
21 /**
22  * this state represents objects which are not persisted and no longer used.
23  */
24 public class StateTransient extends ModificationState
25 {
26     private static StateTransient _instance = new StateTransient();
27
28     /**
29      * private constructor: we use singleton instances
30      */
31     private StateTransient()
32     {
33     }
34
35     /**
36      * perform a checkpoint, i.e. perform updates on underlying db but keep locks on objects
37      */
38     public static StateTransient getInstance()
39     {
40         return _instance;
41     }
42
43     /**
44      * return resulting state after marking clean
45      */
46     public ModificationState markClean()
47     {
48         return this;
49     }
50
51     /**
52      * return resulting state after marking delete
53      */
54     public ModificationState markDelete()
55     {
56         return this;
57     }
58
59     /**
60      * return resulting state after marking dirty
61      */
62     public ModificationState markDirty()
63     {
64         return this;
65     }
66
67     /**
68      * return resulting state after marking new
69      */
70     public ModificationState markNew()
71     {
72         return StateNewClean.getInstance();
73     }
74
75     /**
76      * return resulting state after marking old
77      */
78     public ModificationState markOld()
79     {
80         return this;
81     }
82
83     /**
84      * object is new, thus we need an INSERT to store it
85      */
86     public boolean needsInsert()
87     {
88         return false;
89     }
90
91     /**
92      * checkpoint the transaction
93      */
94     public void checkpoint(ObjectEnvelope mod) throws PersistenceBrokerException
95     {
96     }
97
98
99     /**
100      * commit the associated transaction
101      */
102     public void commit(ObjectEnvelope mod) throws PersistenceBrokerException
103     {
104     }
105
106     /**
107      * rollback the transaction
108      */
109     public void rollback(ObjectEnvelope mod)
110     {
111     }
112
113     public boolean isTransient()
114     {
115         return true;
116     }
117 }
118
Popular Tags