/*
 * Copyright 2002-2017 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;

import java.util.Set;

Interface that defines abstract access to the annotations of a specific
class, in a form that does not require that class to be loaded yet.
Author:
Juergen Hoeller, Mark Fisher, Phillip Webb, Sam Brannen
See Also:
StandardAnnotationMetadata
MetadataReader.getAnnotationMetadata()
AnnotatedTypeMetadata
Since:
2.5/**
 * Interface that defines abstract access to the annotations of a specific
 * class, in a form that does not require that class to be loaded yet.
 *
 * @author Juergen Hoeller
 * @author Mark Fisher
 * @author Phillip Webb
 * @author Sam Brannen
 * @since 2.5
 * @see StandardAnnotationMetadata
 * @see org.springframework.core.type.classreading.MetadataReader#getAnnotationMetadata()
 * @see AnnotatedTypeMetadata
 */
public interface AnnotationMetadata extends ClassMetadata, AnnotatedTypeMetadata {

	
Get the fully qualified class names of all annotation types that
are present on the underlying class.
Returns:
the annotation type names/**
	 * Get the fully qualified class names of all annotation types that
	 * are <em>present</em> on the underlying class.
	 * @return the annotation type names
	 */
	Set<String> getAnnotationTypes();

	
Get the fully qualified class names of all meta-annotation types that
are present on the given annotation type on the underlying class.
Params:
annotationName – the fully qualified class name of the meta-annotation
type to look for
Returns:
the meta-annotation type names, or an empty set if none found/**
	 * Get the fully qualified class names of all meta-annotation types that
	 * are <em>present</em> on the given annotation type on the underlying class.
	 * @param annotationName the fully qualified class name of the meta-annotation
	 * type to look for
	 * @return the meta-annotation type names, or an empty set if none found
	 */
	Set<String> getMetaAnnotationTypes(String annotationName);

	
Determine whether an annotation of the given type is present on
the underlying class.
Params:
annotationName – the fully qualified class name of the annotation
type to look for
Returns:
true if a matching annotation is present/**
	 * Determine whether an annotation of the given type is <em>present</em> on
	 * the underlying class.
	 * @param annotationName the fully qualified class name of the annotation
	 * type to look for
	 * @return {@code true} if a matching annotation is present
	 */
	boolean hasAnnotation(String annotationName);

	
Determine whether the underlying class has an annotation that is itself
annotated with the meta-annotation of the given type.
Params:
metaAnnotationName – the fully qualified class name of the
meta-annotation type to look for
Returns:
true if a matching meta-annotation is present/**
	 * Determine whether the underlying class has an annotation that is itself
	 * annotated with the meta-annotation of the given type.
	 * @param metaAnnotationName the fully qualified class name of the
	 * meta-annotation type to look for
	 * @return {@code true} if a matching meta-annotation is present
	 */
	boolean hasMetaAnnotation(String metaAnnotationName);

	
Determine whether the underlying class has any methods that are
annotated (or meta-annotated) with the given annotation type.
Params:
annotationName – the fully qualified class name of the annotation
type to look for/**
	 * Determine whether the underlying class has any methods that are
	 * annotated (or meta-annotated) with the given annotation type.
	 * @param annotationName the fully qualified class name of the annotation
	 * type to look for
	 */
	boolean hasAnnotatedMethods(String annotationName);

	
Retrieve the method metadata for all methods that are annotated
(or meta-annotated) with the given annotation type.
For any returned method, AnnotatedTypeMetadata.isAnnotated will return true for the given annotation type. 
Params:
annotationName – the fully qualified class name of the annotation
type to look for
Returns:
a set of MethodMetadata for methods that have a matching annotation. The return value will be an empty set if no methods match the annotation type./**
	 * Retrieve the method metadata for all methods that are annotated
	 * (or meta-annotated) with the given annotation type.
	 * <p>For any returned method, {@link MethodMetadata#isAnnotated} will
	 * return {@code true} for the given annotation type.
	 * @param annotationName the fully qualified class name of the annotation
	 * type to look for
	 * @return a set of {@link MethodMetadata} for methods that have a matching
	 * annotation. The return value will be an empty set if no methods match
	 * the annotation type.
	 */
	Set<MethodMetadata> getAnnotatedMethods(String annotationName);

}