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/*
 * 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.
 *
 * 

The matching logic mirrors that of Class.isAnnotationPresent(). * * @author Mark Fisher * @author Ramnivas Laddad * @author Juergen Hoeller * @since 2.5 */ public class AnnotationTypeFilter extends AbstractTypeHierarchyTraversingFilter { private final Class 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 * 'considerMetaAnnotations' argument. * @param annotationType the annotation type to match */ public AnnotationTypeFilter(Class 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 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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