public abstract class AnnotationUtils extends Object
As a general rule for runtime-retained annotations (e.g. for transaction control, authorization or service
exposure), always use the lookup methods on this class (e.g., findAnnotation(Method, Class), getAnnotation(Method, Class), and getAnnotations(Method)) instead of the plain annotation lookup
methods in the JDK. You can still explicitly choose between lookup on the given class level only (getAnnotation(Method, Class)) and lookup in the entire inheritance hierarchy of the given method (findAnnotation(Method, Class)).
AccessibleObject.getAnnotations(),
Method.getAnnotation(Class)| Constructor and Description |
|---|
AnnotationUtils() |
| Modifier and Type | Method and Description |
|---|---|
static <A extends Annotation> |
findAnnotation(Class<?> clazz,
Class<A> annotationType)
Find a single
Annotation of annotationType from the supplied Class,
traversing its interfaces and superclasses if no annotation can be found on the given class itself. |
static <A extends Annotation> |
findAnnotation(Method method,
Class<A> annotationType)
Get a single
Annotation of annotationType from the supplied Method,
traversing its super methods if no annotation can be found on the given method itself. |
static Class<?> |
findAnnotationDeclaringClass(Class<? extends Annotation> annotationType,
Class<?> clazz)
Find the first
Class in the inheritance hierarchy of the specified clazz
(including the specified clazz itself) which declares an annotation for the
specified annotationType, or null if not found. |
static <T extends Annotation> |
getAnnotation(AnnotatedElement ae,
Class<T> annotationType)
Get a single
Annotation of annotationType from the supplied
Method, Constructor or Field. |
static <A extends Annotation> |
getAnnotation(Method method,
Class<A> annotationType)
|
static Map<String,Object> |
getAnnotationAttributes(Annotation annotation)
Retrieve the given annotation's attributes as a Map, preserving all attribute types
as-is.
|
static Map<String,Object> |
getAnnotationAttributes(Annotation annotation,
boolean classValuesAsString)
Retrieve the given annotation's attributes as a Map.
|
static AnnotationAttributes |
getAnnotationAttributes(Annotation annotation,
boolean classValuesAsString,
boolean nestedAnnotationsAsMap)
Retrieve the given annotation's attributes as an
AnnotationAttributes
map structure. |
static Annotation[] |
getAnnotations(Method method)
Get all
Annotations from the supplied Method. |
static Object |
getDefaultValue(Annotation annotation)
Retrieve the default value of the
"value" attribute
of a single-element Annotation, given an annotation instance. |
static Object |
getDefaultValue(Annotation annotation,
String attributeName)
Retrieve the default value of a named Annotation attribute, given an annotation instance.
|
static Object |
getDefaultValue(Class<? extends Annotation> annotationType)
Retrieve the default value of the
"value" attribute
of a single-element Annotation, given the annotation type. |
static Object |
getDefaultValue(Class<? extends Annotation> annotationType,
String attributeName)
Retrieve the default value of a named Annotation attribute, given the
annotation type. |
static Object |
getValue(Annotation annotation)
Retrieve the value of the
"value" attribute of a
single-element Annotation, given an annotation instance. |
static Object |
getValue(Annotation annotation,
String attributeName)
Retrieve the value of a named Annotation attribute, given an annotation instance.
|
static boolean |
isAnnotationDeclaredLocally(Class<? extends Annotation> annotationType,
Class<?> clazz)
Determine whether an annotation for the specified
annotationType is
declared locally on the supplied clazz. |
static boolean |
isAnnotationInherited(Class<? extends Annotation> annotationType,
Class<?> clazz)
Determine whether an annotation for the specified
annotationType is present
on the supplied clazz and is inherited
i.e., not declared locally for the class). |
public static <T extends Annotation> T getAnnotation(AnnotatedElement ae, Class<T> annotationType)
Annotation of annotationType from the supplied
Method, Constructor or Field. Meta-annotations will be searched if the annotation
is not declared locally on the supplied element.ae - the Method, Constructor or Field from which to get the annotationannotationType - the annotation class to look for, both locally and as a meta-annotationnull if not foundpublic static Annotation[] getAnnotations(Method method)
Annotations from the supplied Method.
Correctly handles bridge Methods generated by the compiler.
method - the method to look for annotations onBridgeMethodResolver.findBridgedMethod(Method)public static <A extends Annotation> A getAnnotation(Method method, Class<A> annotationType)
Annotation of annotationType from the supplied Method.
Correctly handles bridge Methods generated by the compiler.
method - the method to look for annotations onannotationType - the annotation class to look forBridgeMethodResolver.findBridgedMethod(Method)public static <A extends Annotation> A findAnnotation(Method method, Class<A> annotationType)
Annotation of annotationType from the supplied Method,
traversing its super methods if no annotation can be found on the given method itself.
Annotations on methods are not inherited by default, so we need to handle this explicitly.
method - the method to look for annotations onannotationType - the annotation class to look fornull if none foundpublic static <A extends Annotation> A findAnnotation(Class<?> clazz, Class<A> annotationType)
Annotation of annotationType from the supplied Class,
traversing its interfaces and superclasses if no annotation can be found on the given class itself.
This method explicitly handles class-level annotations which are not declared as
inherited as well as annotations on interfaces.
The algorithm operates as follows: Searches for an annotation on the given class and returns it if found. Else searches all interfaces that the given class declares, returning the annotation from the first matching candidate, if any. Else proceeds with introspection of the superclass of the given class, checking the superclass itself; if no annotation found there, proceeds with the interfaces that the superclass declares. Recursing up through the entire superclass hierarchy if no match is found.
clazz - the class to look for annotations onannotationType - the annotation class to look fornull if none foundpublic static Class<?> findAnnotationDeclaringClass(Class<? extends Annotation> annotationType, Class<?> clazz)
Class in the inheritance hierarchy of the specified clazz
(including the specified clazz itself) which declares an annotation for the
specified annotationType, or null if not found. If the supplied
clazz is null, null will be returned.
If the supplied clazz is an interface, only the interface itself will be checked;
the inheritance hierarchy for interfaces will not be traversed.
The standard Class API does not provide a mechanism for determining which class
in an inheritance hierarchy actually declares an Annotation, so we need to handle
this explicitly.
annotationType - the Class object corresponding to the annotation typeclazz - the Class object corresponding to the class on which to check for the annotation,
or nullClass in the inheritance hierarchy of the specified clazz
which declares an annotation for the specified annotationType, or null
if not foundClass.isAnnotationPresent(Class),
Class.getDeclaredAnnotations()public static boolean isAnnotationDeclaredLocally(Class<? extends Annotation> annotationType, Class<?> clazz)
annotationType is
declared locally on the supplied clazz. The supplied Class
may represent any type.
Note: This method does not determine if the annotation is
inherited. For greater clarity regarding inherited
annotations, consider using isAnnotationInherited(Class, Class) instead.
annotationType - the Class object corresponding to the annotation typeclazz - the Class object corresponding to the class on which to check for the annotationtrue if an annotation for the specified annotationType
is declared locally on the supplied clazzClass.getDeclaredAnnotations(),
isAnnotationInherited(Class, Class)public static boolean isAnnotationInherited(Class<? extends Annotation> annotationType, Class<?> clazz)
annotationType is present
on the supplied clazz and is inherited
i.e., not declared locally for the class).
If the supplied clazz is an interface, only the interface itself will be checked.
In accordance with standard meta-annotation semantics, the inheritance hierarchy for interfaces
will not be traversed. See the JavaDoc for the
@Inherited meta-annotation for further details regarding annotation inheritance.
annotationType - the Class object corresponding to the annotation typeclazz - the Class object corresponding to the class on which to check for the annotationtrue if an annotation for the specified annotationType is present
on the supplied clazz and is inheritedClass.isAnnotationPresent(Class),
isAnnotationDeclaredLocally(Class, Class)public static Map<String,Object> getAnnotationAttributes(Annotation annotation)
Note: As of Spring 3.1.1, the returned map is actually an
AnnotationAttributes instance, however the Map signature of this method has
been preserved for binary compatibility.
annotation - the annotation to retrieve the attributes forpublic static Map<String,Object> getAnnotationAttributes(Annotation annotation, boolean classValuesAsString)
getAnnotationAttributes(Annotation, boolean, boolean) with
the nestedAnnotationsAsMap parameter set to false.
Note: As of Spring 3.1.1, the returned map is actually an
AnnotationAttributes instance, however the Map signature of this method has
been preserved for binary compatibility.
annotation - the annotation to retrieve the attributes forclassValuesAsString - whether to turn Class references into Strings (for
compatibility with AnnotationMetadata or to
preserve them as Class referencespublic static AnnotationAttributes getAnnotationAttributes(Annotation annotation, boolean classValuesAsString, boolean nestedAnnotationsAsMap)
AnnotationAttributes
map structure. Implemented in Spring 3.1.1 to provide fully recursive annotation
reading capabilities on par with that of the reflection-based
StandardAnnotationMetadata.annotation - the annotation to retrieve the attributes forclassValuesAsString - whether to turn Class references into Strings (for
compatibility with AnnotationMetadata or to
preserve them as Class referencesnestedAnnotationsAsMap - whether to turn nested Annotation instances into
AnnotationAttributes maps (for compatibility with
AnnotationMetadata or to preserve them as
Annotation instancespublic static Object getValue(Annotation annotation)
"value" attribute of a
single-element Annotation, given an annotation instance.annotation - the annotation instance from which to retrieve the valuenull if not foundgetValue(Annotation, String)public static Object getValue(Annotation annotation, String attributeName)
annotation - the annotation instance from which to retrieve the valueattributeName - the name of the attribute value to retrievenull if not foundgetValue(Annotation)public static Object getDefaultValue(Annotation annotation)
"value" attribute
of a single-element Annotation, given an annotation instance.annotation - the annotation instance from which to retrieve the default valuenull if not foundgetDefaultValue(Annotation, String)public static Object getDefaultValue(Annotation annotation, String attributeName)
annotation - the annotation instance from which to retrieve the default valueattributeName - the name of the attribute value to retrievenull if not foundgetDefaultValue(Class, String)public static Object getDefaultValue(Class<? extends Annotation> annotationType)
"value" attribute
of a single-element Annotation, given the annotation type.annotationType - the annotation type for which the default value should be retrievednull if not foundgetDefaultValue(Class, String)public static Object getDefaultValue(Class<? extends Annotation> annotationType, String attributeName)
annotation type.annotationType - the annotation type for which the default value should be retrievedattributeName - the name of the attribute value to retrieve.null if not foundgetDefaultValue(Annotation, String)Copyright © 2006–2018 TinyGroup. All rights reserved.