Spring Framework example source code file (AnnotationBeanNameGenerator.java)
The Spring Framework AnnotationBeanNameGenerator.java source code
/*
* Copyright 2002-2008 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.context.annotation;
import java.beans.Introspector;
import java.util.Map;
import java.util.Set;
import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanNameGenerator;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.util.ClassUtils;
import org.springframework.util.StringUtils;
/**
* {@link org.springframework.beans.factory.support.BeanNameGenerator}
* implementation for bean classes annotated with the
* {@link org.springframework.stereotype.Component @Component} annotation
* or with another annotation that is itself annotated with
* {@link org.springframework.stereotype.Component @Component} as a
* meta-annotation. For example, Spring's stereotype annotations (such as
* {@link org.springframework.stereotype.Repository @Repository}) are
* themselves annotated with
* {@link org.springframework.stereotype.Component @Component}.
*
* <p>If the annotation's value doesn't indicate a bean name, an appropriate
* name will be built based on the short name of the class (with the first
* letter lower-cased). For example:
*
* <pre class="code">com.xyz.FooServiceImpl -> fooServiceImpl
*
* @author Juergen Hoeller
* @author Mark Fisher
* @since 2.5
* @see org.springframework.stereotype.Component#value()
* @see org.springframework.stereotype.Repository#value()
* @see org.springframework.stereotype.Service#value()
* @see org.springframework.stereotype.Controller#value()
*/
public class AnnotationBeanNameGenerator implements BeanNameGenerator {
private static final String COMPONENT_ANNOTATION_CLASSNAME = "org.springframework.stereotype.Component";
public String generateBeanName(BeanDefinition definition, BeanDefinitionRegistry registry) {
if (definition instanceof AnnotatedBeanDefinition) {
String beanName = determineBeanNameFromAnnotation((AnnotatedBeanDefinition) definition);
if (StringUtils.hasText(beanName)) {
// Explicit bean name found.
return beanName;
}
}
// Fallback: generate a unique default bean name.
return buildDefaultBeanName(definition);
}
/**
* Derive a bean name from one of the annotations on the class.
* @param annotatedDef the annotation-aware bean definition
* @return the bean name, or <code>null if none is found
*/
protected String determineBeanNameFromAnnotation(AnnotatedBeanDefinition annotatedDef) {
AnnotationMetadata amd = annotatedDef.getMetadata();
Set<String> types = amd.getAnnotationTypes();
String beanName = null;
for (String type : types) {
Map<String, Object> attributes = amd.getAnnotationAttributes(type);
if (isStereotypeWithNameValue(type, amd.getMetaAnnotationTypes(type), attributes)) {
String value = (String) attributes.get("value");
if (StringUtils.hasLength(value)) {
if (beanName != null && !value.equals(beanName)) {
throw new IllegalStateException("Stereotype annotations suggest inconsistent " +
"component names: '" + beanName + "' versus '" + value + "'");
}
beanName = value;
}
}
}
return beanName;
}
/**
* Check whether the given annotation is a stereotype that is allowed
* to suggest a component name through its annotation <code>value().
* @param annotationType the name of the annotation class to check
* @param metaAnnotationTypes the names of meta-annotations on the given annotation
* @param attributes the map of attributes for the given annotation
* @return whether the annotation qualifies as a stereotype with component name
*/
protected boolean isStereotypeWithNameValue(String annotationType,
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