1 package org.apache.onami.persist;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import org.aopalliance.intercept.MethodInvocation;
23
24 import javax.inject.Singleton;
25 import java.lang.reflect.Method;
26
27 /**
28 * Reader which obtains the concrete {@link Transactional @Transactional} annotation of a method.
29 */
30 @Singleton
31 class TransactionalAnnotationReader
32 {
33
34 /**
35 * Constant holding a transactional instance with all default values.
36 */
37 private static final Transactional DEFAULT_TRANSACTIONAL =
38 DefaultTransactional.class.getAnnotation( Transactional.class );
39
40 /**
41 * Reads the {@link Transactional @Transactional} of a given method invocation.
42 *
43 * @param methodInvocation the method invocation for which to obtain the {@link Transactional @Transactional}.
44 * @return the {@link Transactional @Transactional} of the given method invocation. Never {@code null}.
45 */
46 Transactional readAnnotationFrom( MethodInvocation methodInvocation )
47 {
48 Transactional result;
49 final Method method = methodInvocation.getMethod();
50 result = method.getAnnotation( Transactional.class );
51 if ( null == result )
52 {
53 final Class<?> targetClass = methodInvocation.getThis().getClass();
54 result = targetClass.getAnnotation( Transactional.class );
55 }
56 if ( null == result )
57 {
58 result = DEFAULT_TRANSACTIONAL;
59 }
60 return result;
61 }
62
63 /**
64 * Helper class for obtaining the default of {@link Transactional @Transactional}.
65 */
66 @Transactional
67 private static class DefaultTransactional
68 {
69 }
70
71 }