1 /*
2 * Copyright 2002-2011 the original author or authors.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package org.springframework.context.annotation;
18
19 import org.springframework.beans.factory.parsing.Problem;
20 import org.springframework.beans.factory.parsing.ProblemReporter;
21 import org.springframework.core.type.MethodMetadata;
22
23 /**
24 * Represents a {@link Configuration} class method marked with the
25 * {@link Bean} annotation.
26 *
27 * @author Chris Beams
28 * @author Juergen Hoeller
29 * @since 3.0
30 * @see ConfigurationClass
31 * @see ConfigurationClassParser
32 * @see ConfigurationClassBeanDefinitionReader
33 */
34 final class BeanMethod extends ConfigurationMethod {
35
36 public BeanMethod(MethodMetadata metadata, ConfigurationClass configurationClass) {
37 super(metadata, configurationClass);
38 }
39
40 @Override
41 public void validate(ProblemReporter problemReporter) {
42 if (getMetadata().isStatic()) {
43 // static @Bean methods have no constraints to validate -> return immediately
44 return;
45 }
46
47 if (this.configurationClass.getMetadata().isAnnotated(Configuration.class.getName())) {
48 if (!getMetadata().isOverridable()) {
49 // instance @Bean methods within @Configuration classes must be overridable to accommodate CGLIB
50 problemReporter.error(new NonOverridableMethodError());
51 }
52 }
53 }
54
55
56 private class NonOverridableMethodError extends Problem {
57
58 public NonOverridableMethodError() {
59 super(String.format("@Bean method '%s' must not be private or final; change the method's modifiers to continue",
60 getMetadata().getMethodName()), getResourceLocation());
61 }
62 }
63 }