org.springframework.core.type.classreading.AnnotationMetadataReadingVisitor Maven / Gradle / Ivy
/*
* 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.core.type.classreading;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.Type;
import org.objectweb.asm.commons.EmptyVisitor;
import org.springframework.core.type.AnnotationMetadata;
/**
* ASM class visitor which looks for the class name and implemented types as
* well as for the annotations defined on the class, exposing them through
* the {@link org.springframework.core.type.AnnotationMetadata} interface.
*
* @author Juergen Hoeller
* @author Mark Fisher
* @since 2.5
*/
class AnnotationMetadataReadingVisitor extends ClassMetadataReadingVisitor implements AnnotationMetadata {
private final Map> attributesMap = new LinkedHashMap>();
private final Map> metaAnnotationMap = new LinkedHashMap>();
public AnnotationVisitor visitAnnotation(final String desc, boolean visible) {
final String className = Type.getType(desc).getClassName();
final Map attributes = new LinkedHashMap();
return new EmptyVisitor() {
public void visit(String name, Object value) {
// Explicitly defined annotation attribute value.
attributes.put(name, value);
}
public void visitEnd() {
try {
Class annotationClass = getClass().getClassLoader().loadClass(className);
// Check declared default values of attributes in the annotation type.
Method[] annotationAttributes = annotationClass.getMethods();
for (int i = 0; i < annotationAttributes.length; i++) {
Method annotationAttribute = annotationAttributes[i];
String attributeName = annotationAttribute.getName();
Object defaultValue = annotationAttribute.getDefaultValue();
if (defaultValue != null && !attributes.containsKey(attributeName)) {
attributes.put(attributeName, defaultValue);
}
}
// Register annotations that the annotation type is annotated with.
Annotation[] metaAnnotations = annotationClass.getAnnotations();
Set metaAnnotationTypeNames = new HashSet();
for (Annotation metaAnnotation : metaAnnotations) {
metaAnnotationTypeNames.add(metaAnnotation.annotationType().getName());
}
metaAnnotationMap.put(className, metaAnnotationTypeNames);
}
catch (ClassNotFoundException ex) {
// Class not found - can't determine meta-annotations.
}
attributesMap.put(className, attributes);
}
};
}
public Set getAnnotationTypes() {
return this.attributesMap.keySet();
}
public boolean hasAnnotation(String annotationType) {
return this.attributesMap.containsKey(annotationType);
}
public Set getMetaAnnotationTypes(String annotationType) {
return this.metaAnnotationMap.get(annotationType);
}
public boolean hasMetaAnnotation(String metaAnnotationType) {
Collection> allMetaTypes = this.metaAnnotationMap.values();
for (Set metaTypes : allMetaTypes) {
if (metaTypes.contains(metaAnnotationType)) {
return true;
}
}
return false;
}
public Map getAnnotationAttributes(String annotationType) {
return this.attributesMap.get(annotationType);
}
}