/*
* 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.filter;
import java.lang.annotation.Annotation;
import java.lang.annotation.Inherited;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.core.type.classreading.MetadataReader;
/**
* A simple filter which matches classes with a given annotation,
* checking inherited annotations as well.
*
* <p>The matching logic mirrors that of <code>Class.isAnnotationPresent()</code>.
*
* @author Mark Fisher
* @author Ramnivas Laddad
* @author Juergen Hoeller
* @since 2.5
*/
public class AnnotationTypeFilter extends AbstractTypeHierarchyTraversingFilter {
private final Class<? extends Annotation> annotationType;
private final boolean considerMetaAnnotations;
/**
* Create a new AnnotationTypeFilter for the given annotation type.
* This filter will also match meta-annotations. To disable the
* meta-annotation matching, use the constructor that accepts a
* '<code>considerMetaAnnotations</code>' argument.
* @param annotationType the annotation type to match
*/
public AnnotationTypeFilter(Class<? extends Annotation> annotationType) {
this(annotationType, true);
}
/**
* Create a new AnnotationTypeFilter for the given annotation type.
* @param annotationType the annotation type to match
* @param considerMetaAnnotations whether to also match on meta-annotations
*/
public AnnotationTypeFilter(Class<? extends Annotation> annotationType, boolean considerMetaAnnotations) {
super(annotationType.isAnnotationPresent(Inherited.class), false);
this.annotationType = annotationType;
this.considerMetaAnnotations = considerMetaAnnotations;
}
@Override
protected boolean matchSelf(MetadataReader metadataReader) {
AnnotationMetadata metadata = metadataReader.getAnnotationMetadata();
return metadata.hasAnnotation(this.annotationType.getName()) ||
(this.considerMetaAnnotations && metadata.hasMetaAnnotation(this.annotationType.getName()));
}
@Override
protected Boolean matchSuperClass(String superClassName) {
if (Object.class.getName().equals(superClassName)) {
return Boolean.FALSE;
}
else if (superClassName.startsWith("java.")) {
try {
Class<?> clazz = getClass().getClassLoader().loadClass(superClassName);
return (clazz.getAnnotation(this.annotationType) != null);
}
catch (ClassNotFoundException ex) {
// Class not found - can't determine a match that way.
}
}
return null;
}
}
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