/*
* Copyright 2002-2009 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.Array;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
import org.springframework.asm.AnnotationVisitor;
import org.springframework.asm.Type;
import org.springframework.asm.commons.EmptyVisitor;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.util.ObjectUtils;
import org.springframework.util.ReflectionUtils;
/**
* ASM visitor which looks for the annotations defined on a class or method.
*
* @author Juergen Hoeller
* @since 3.0
*/
final class AnnotationAttributesReadingVisitor implements AnnotationVisitor {
private final String annotationType;
private final Map<String, Map<String, Object>> attributesMap;
private final Map<String, Set<String>> metaAnnotationMap;
private final ClassLoader classLoader;
private final Map<String, Object> localAttributes = new LinkedHashMap<String, Object>();
public AnnotationAttributesReadingVisitor(
String annotationType, Map<String, Map<String, Object>> attributesMap,
Map<String, Set<String>> metaAnnotationMap, ClassLoader classLoader) {
this.annotationType = annotationType;
this.attributesMap = attributesMap;
this.metaAnnotationMap = metaAnnotationMap;
this.classLoader = classLoader;
}
public void visit(String name, Object value) {
this.localAttributes.put(name, value);
}
public void visitEnum(String name, String desc, String value) {
Object valueToUse = value;
try {
Class<?> enumType = this.classLoader.loadClass(Type.getType(desc).getClassName());
Field enumConstant = ReflectionUtils.findField(enumType, value);
if (enumConstant != null) {
valueToUse = enumConstant.get(null);
}
}
catch (Exception ex) {
// Class not found - can't resolve class reference in annotation attribute.
}
this.localAttributes.put(name, valueToUse);
}
public AnnotationVisitor visitAnnotation(String name, String desc) {
return new EmptyVisitor();
}
public AnnotationVisitor visitArray(final String attrName) {
return new AnnotationVisitor() {
public void visit(String name, Object value) {
Object newValue = value;
Object existingValue = localAttributes.get(attrName);
if (existingValue != null) {
newValue = ObjectUtils.addObjectToArray((Object[]) existingValue, newValue);
}
else {
Object[] newArray = (Object[]) Array.newInstance(newValue.getClass(), 1);
newArray[0] = newValue;
newValue = newArray;
}
localAttributes.put(attrName, newValue);
}
public void visitEnum(String name, String desc, String value) {
}
public AnnotationVisitor visitAnnotation(String name, String desc) {
return new EmptyVisitor();
}
public AnnotationVisitor visitArray(String name) {
return new EmptyVisitor();
}
public void visitEnd() {
}
};
}
public void visitEnd() {
this.attributesMap.put(this.annotationType, this.localAttributes);
try {
Class<?> annotationClass = this.classLoader.loadClass(this.annotationType);
// 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.localAttributes.containsKey(attributeName)) {
this.localAttributes.put(attributeName, defaultValue);
}
}
// Register annotations that the annotation type is annotated with.
Set<String> metaAnnotationTypeNames = new LinkedHashSet<String>();
for (Annotation metaAnnotation : annotationClass.getAnnotations()) {
metaAnnotationTypeNames.add(metaAnnotation.annotationType().getName());
if (!this.attributesMap.containsKey(metaAnnotation.annotationType().getName())) {
this.attributesMap.put(metaAnnotation.annotationType().getName(),
AnnotationUtils.getAnnotationAttributes(metaAnnotation, true));
}
for (Annotation metaMetaAnnotation : metaAnnotation.annotationType().getAnnotations()) {
metaAnnotationTypeNames.add(metaMetaAnnotation.annotationType().getName());
}
}
if (this.metaAnnotationMap != null) {
this.metaAnnotationMap.put(this.annotationType, metaAnnotationTypeNames);
}
}
catch (ClassNotFoundException ex) {
// Class not found - can't determine meta-annotations.
}
}
}
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