1 //----------------------------------------------------------------------
2 //
3 // PerfectJPattern: "Design patterns are good but components are better!"
4 // EntityManagerAdapter.java Copyright (c) 2009 Giovanni Azua Garcia
5 // bravegag@hotmail.com
6 //
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License
9 // as published by the Free Software Foundation; either version 3
10 // of the License, or (at your option) any later version.
11 //
12 // This program is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
16 //
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, see <http://www.gnu.org/licenses/>.
19 //
20 //----------------------------------------------------------------------
21 package org.perfectjpattern.jee.integration.dao;
22
23 import java.lang.reflect.*;
24
25 import javax.persistence.*;
26
27 import org.perfectjpattern.core.api.structural.adapter.*;
28 import org.perfectjpattern.core.structural.adapter.*;
29 import org.perfectjpattern.jee.api.integration.dao.*;
30
31 /**
32 * Adapts JPA's {@link EntityManager} to the JPA implementation-free
33 * PerfectJPattern's {@link ISession} definition
34 *
35 * @author <a href="mailto:bravegag@hotmail.com">Giovanni Azua</a>
36 * @version $Revision: 1.0 $Date: Feb 10, 2009 8:26:06 PM $
37 */
38 public final
39 class EntityManagerAdapter
40 extends Adapter<ISession, EntityManager>
41 {
42 //------------------------------------------------------------------------
43 // public
44 //------------------------------------------------------------------------
45 /**
46 * Constructs a {@link EntityManagerAdapter} from the Adaptee
47 * {@link EntityManager} instance
48 *
49 * @param anAdaptee The Adaptee {@link EntityManager}
50 * @throws IllegalArgumentException 'anAdaptee' must not be null
51 */
52 public
53 EntityManagerAdapter(EntityManager anAdaptee)
54 throws IllegalArgumentException
55 {
56 super(ISession.class, anAdaptee);
57 }
58
59 //------------------------------------------------------------------------
60 // protected
61 //------------------------------------------------------------------------
62 /**
63 * {@inheritDoc}
64 */
65 @Override
66 protected Object
67 invokeUnderlying(Method aMethod, Object[] anArguments)
68 throws Throwable
69 {
70 try
71 {
72 return super.invokeUnderlying(aMethod, anArguments);
73 }
74 // CHECKSTYLE:OFF
75 catch (Throwable anException)
76 // CHECKSTYLE:ON
77 {
78 // make sure that Exceptions are properly chained
79 throw new DaoException(anException);
80 }
81 }
82
83 //------------------------------------------------------------------------
84 public void
85 update(Object anObject)
86 {
87 // approximation to update in JPA
88 getUnderlying().merge(anObject);
89 }
90
91 //------------------------------------------------------------------------
92 public IQuery
93 createQuery(String aSqlString)
94 {
95 // adapts the Query
96 IQuery myQuery = new JpaQueryAdapter(getUnderlying().createQuery(
97 aSqlString)).getTarget();
98
99 return myQuery;
100 }
101
102 //------------------------------------------------------------------------
103 public IQuery
104 createNativeQuery(String aSqlString, Class<?> aPersistentClass)
105 {
106 // adapts the Query
107 IQuery myQuery = new JpaQueryAdapter(getUnderlying().
108 createNativeQuery(aSqlString, aPersistentClass)).getTarget();
109
110 return myQuery;
111 }
112
113 //------------------------------------------------------------------------
114 public ITransaction
115 getTransaction()
116 {
117 // adapts the EntityTransaction
118 EntityTransaction myAdaptee = getUnderlying().getTransaction();
119
120 if (theTransactionAdapter == null || theTransactionAdapter.
121 getAdaptee() != myAdaptee)
122 {
123 theTransactionAdapter = new EntityTransactionAdapter(myAdaptee);
124 }
125
126 assert theTransactionAdapter != null :
127 "Transaction Adapter must not be null";
128
129 return theTransactionAdapter.getTarget();
130 }
131
132 //------------------------------------------------------------------------
133 // members
134 //------------------------------------------------------------------------
135 private IAdapter<ITransaction, EntityTransaction> theTransactionAdapter;
136 }