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Java > Open Source Codes > org > netbeans > modules > j2ee > persistence > spi > entitymanagergenerator > ApplicationManagedResourceTransactionInJ2SE


1 /*
2  * The contents of this file are subject to the terms of the Common Development
3  * and Distribution License (the License). You may not use this file except in
4  * compliance with the License.
5  *
6  * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
7  * or http://www.netbeans.org/cddl.txt.
8  *
9  * When distributing Covered Code, include this CDDL Header Notice in each file
10  * and include the License file at http://www.netbeans.org/cddl.txt.
11  * If applicable, add the following below the CDDL Header, with the fields
12  * enclosed by brackets [] replaced by your own identifying information:
13  * "Portions Copyrighted [year] [name of copyright owner]"
14  *
15  * The Original Software is NetBeans. The Initial Developer of the Original
16  * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
17  * Microsystems, Inc. All Rights Reserved.
18  */
19
20 package org.netbeans.modules.j2ee.persistence.spi.entitymanagergenerator;
21
22 import org.netbeans.modules.j2ee.persistence.action.*;
23 import com.sun.source.tree.AnnotationTree;
24 import com.sun.source.tree.ClassTree;
25 import com.sun.source.tree.ExpressionTree;
26 import com.sun.source.tree.MethodTree;
27 import com.sun.source.tree.ModifiersTree;
28 import com.sun.source.tree.TypeParameterTree;
29 import java.util.Collections JavaDoc;
30 import javax.lang.model.element.Modifier;
31 import javax.lang.model.type.TypeKind;
32
33 /**
34  * Generates the code needed for invoking an <code>EntityManager</code> in Java SE
35  * enviroment with an application-managed persistence unit.
36  *
37  * @author Erno Mononen
38  */
39 public final class ApplicationManagedResourceTransactionInJ2SE extends EntityManagerGenerationStrategySupport{
40     
41     public ClassTree generate() {
42         
43         ModifiersTree methodModifiers = getTreeMaker().Modifiers(
44                 Collections.<Modifier>singleton(Modifier.PUBLIC),
45                 Collections.<AnnotationTree>emptyList()
46                 );
47         
48         String JavaDoc text =
49                 "javax.persistence.EntityManagerFactory emf = javax.persistence.Persistence.createEntityManagerFactory(\"" + getPersistenceUnitName() + "\");\n" +
50                 "javax.persistence.EntityManager em = emf.createEntityManager();\n" +
51                 "em.getTransaction().begin();\n" +
52                 "try {\n" +
53                 generateCallLines() +
54                 " em.getTransaction().commit();\n" +
55                 "} catch (Exception e) {\n" +
56                 " e.printStackTrace();\n" +
57                 " em.getTransaction().rollback();\n" +
58                 "} finally {\n" +
59                 " em.close();\n" +
60                 "}";
61         
62         MethodTree newMethod = getTreeMaker().Method(
63                 methodModifiers,
64                 computeMethodName(),
65                 getTreeMaker().PrimitiveType(TypeKind.VOID),
66                 Collections.<TypeParameterTree>emptyList(),
67                 getParameterList(),
68                 Collections.<ExpressionTree>emptyList(),
69                 "{ " + text + "}",
70                 null
71                 );
72         
73         return getTreeMaker().addClassMember(getClassTree(), newMethod);
74     }
75     
76 }
77
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