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Java > Open Source Codes > com > sun > jdo > spi > persistence > support > sqlstore > state > Hollow


1 /*
2  * The contents of this file are subject to the terms
3  * of the Common Development and Distribution License
4  * (the License). You may not use this file except in
5  * compliance with the License.
6  *
7  * You can obtain a copy of the license at
8  * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9  * glassfish/bootstrap/legal/CDDLv1.0.txt.
10  * See the License for the specific language governing
11  * permissions and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL
14  * Header Notice in each file and include the License file
15  * at glassfish/bootstrap/legal/CDDLv1.0.txt.
16  * If applicable, add the following below the CDDL Header,
17  * with the fields enclosed by brackets [] replaced by
18  * you own identifying information:
19  * "Portions Copyrighted [year] [name of copyright owner]"
20  *
21  * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22  */
23
24 /*
25  * Hollow.java March 10, 2000 Steffi Rauschenbach
26  */
27
28 package com.sun.jdo.spi.persistence.support.sqlstore.state;
29
30 import com.sun.jdo.spi.persistence.utility.I18NHelper;
31 import com.sun.jdo.spi.persistence.support.sqlstore.ActionDesc;
32
33 import java.util.ResourceBundle JavaDoc;
34
35
36 public class Hollow extends LifeCycleState {
37     /**
38      * I18N message handler
39      */
40     private final static ResourceBundle JavaDoc messages = I18NHelper.loadBundle(
41             "com.sun.jdo.spi.persistence.support.sqlstore.Bundle", // NOI18N
42 Hollow.class.getClassLoader());
43
44     public Hollow() {
45         // these flags are set only in the constructor
46 // and shouldn't be changed afterwards
47 // (cannot make them final since they are declared in superclass
48 // but their values are specific to subclasses)
49 isPersistent = true;
50         isPersistentInDataStore = true;
51         isTransactional = false;
52         isDirty = false;
53         isNew = false;
54         isDeleted = false;
55         isBeforeImageUpdatable = false;
56         isRefreshable = false;
57         needsRegister = false;
58         needsReload = true;
59         needsRestoreOnRollback = false;
60         updateAction = ActionDesc.LOG_NOOP;
61
62         stateType = HOLLOW;
63     }
64
65     /**
66      * Operations that cause life cycle state transitions
67      */
68     public LifeCycleState transitionDeletePersistent() {
69         return changeState(P_DELETED);
70     }
71
72     public LifeCycleState transitionReadField(boolean optimistic, boolean nontransactionalRead,
73                                               boolean transactionActive) {
74         if (!nontransactionalRead) {
75             assertTransaction(transactionActive);
76         }
77
78         if (optimistic || (nontransactionalRead && !transactionActive)) {
79             return changeState(P_NON_TX);
80         } else {
81             return changeState(P_CLEAN);
82         }
83     }
84
85     public LifeCycleState transitionWriteField(boolean transactionActive) {
86         assertTransaction(transactionActive);
87         return changeState(P_DIRTY);
88     }
89
90     public boolean needsReload(boolean optimistic,
91                                boolean nontransactionalRead,
92                                boolean transactionActive) {
93         //
94 // Don't allow reload in the transaction is not active
95 // and nontransactionalRead is false.
96 //
97 if (!transactionActive && !nontransactionalRead) {
98             return false;
99         }
100
101         return true;
102     }
103
104 }
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