org.springframework.core.type.classreading.RecursiveAnnotationAttributesVisitor Maven / Gradle / Ivy
/*
* Copyright 2002-2014 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.core.type.classreading;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.annotation.AnnotationUtils;
/**
* @author Chris Beams
* @author Juergen Hoeller
* @since 3.1.1
*/
class RecursiveAnnotationAttributesVisitor extends AbstractRecursiveAnnotationVisitor {
private final String annotationType;
public RecursiveAnnotationAttributesVisitor(
String annotationType, AnnotationAttributes attributes, ClassLoader classLoader) {
super(classLoader, attributes);
this.annotationType = annotationType;
}
@Override
public final void visitEnd() {
try {
Class annotationClass = this.classLoader.loadClass(this.annotationType);
doVisitEnd(annotationClass);
}
catch (ClassNotFoundException ex) {
logger.debug("Failed to class-load type while reading annotation metadata. " +
"This is a non-fatal error, but certain annotation metadata may be unavailable.", ex);
}
}
protected void doVisitEnd(Class annotationClass) {
registerDefaultValues(annotationClass);
}
private void registerDefaultValues(Class annotationClass) {
// Only do further scanning for public annotations; we'd run into
// IllegalAccessExceptions otherwise, and we don't want to mess with
// accessibility in a SecurityManager environment.
if (Modifier.isPublic(annotationClass.getModifiers())) {
// Check declared default values of attributes in the annotation type.
Method[] annotationAttributes = annotationClass.getMethods();
for (Method annotationAttribute : annotationAttributes) {
String attributeName = annotationAttribute.getName();
Object defaultValue = annotationAttribute.getDefaultValue();
if (defaultValue != null && !this.attributes.containsKey(attributeName)) {
if (defaultValue instanceof Annotation) {
defaultValue = AnnotationAttributes.fromMap(AnnotationUtils.getAnnotationAttributes(
(Annotation) defaultValue, false, true));
}
else if (defaultValue instanceof Annotation[]) {
Annotation[] realAnnotations = (Annotation[]) defaultValue;
AnnotationAttributes[] mappedAnnotations = new AnnotationAttributes[realAnnotations.length];
for (int i = 0; i < realAnnotations.length; i++) {
mappedAnnotations[i] = AnnotationAttributes.fromMap(
AnnotationUtils.getAnnotationAttributes(realAnnotations[i], false, true));
}
defaultValue = mappedAnnotations;
}
this.attributes.put(attributeName, defaultValue);
}
}
}
}
}