public interface Element extends AnnotatedConstruct
Elements should be compared using the equals(Object) method. There is no guarantee that any particular element will always be represented by the same object.
To implement operations based on the class of an Element object, either use a visitor or use the result of the getKind() method. Using instanceof is not necessarily a reliable idiom for determining the effective class of an object in this modeling hierarchy since an implementation may choose to have a single object implement multiple Element subinterfaces.
Elements,
TypeMirror
| Modifier and Type | Method and Description |
|---|---|
<R |
accept(ElementVisitor
Applies a visitor to this element.
|
TypeMirror |
asType()
Returns the type defined by this element.
|
boolean |
equals(Object
Returns
true if the argument represents the same element as
this, or
false otherwise.
|
<A extends Annotation |
getAnnotation(Class
Returns this construct's annotation of the specified type if such an annotation is
present, else
null.
|
List |
getAnnotationMirrors()
Returns the annotations that are
directly present on this construct.
|
List |
getEnclosedElements()
Returns the elements that are, loosely speaking, directly enclosed by this element.
|
Element |
getEnclosingElement()
Returns the innermost element within which this element is, loosely speaking, enclosed.
|
ElementKind |
getKind()
Returns the
kind of this element.
|
Set |
getModifiers()
Returns the modifiers of this element, excluding annotations.
|
Name |
getSimpleName()
Returns the simple (unqualified) name of this element.
|
int |
hashCode()
Obeys the general contract of
Object.hashCode.
|
getAnnotationsByTypeTypeMirrorasType()
A generic element defines a family of types, not just one. If this is a generic element, a prototypical type is returned. This is the element's invocation on the type variables corresponding to its own formal type parameters. For example, for the generic class element C<N extends Number>, the parameterized type C<N> is returned. The Types utility interface has more general methods for obtaining the full range of types defined by an element.
Types
ElementKindgetKind()
kind of this element.
Set<Modifier > getModifiers()
public and
static modifiers of interface members, are included.
NamegetSimpleName()
java.util.Set<E> is
"Set". If this element represents an unnamed
package, an empty name is returned. If it represents a
constructor, the name "
<init>" is returned. If it represents a
static initializer, the name "
<clinit>" is returned. If it represents an
anonymous class or
instance initializer, an empty name is returned.
PackageElement.getSimpleName() ,
ExecutableElement.getSimpleName() ,
TypeElement.getSimpleName() ,
VariableElement.getSimpleName()
ElementgetEnclosingElement()
null is returned. null if there is none
Elements.getPackageOf(javax.lang.model.element.Element)
List<? extends Element > getEnclosedElements()
Note that elements of certain kinds can be isolated using methods in ElementFilter.
PackageElement.getEnclosedElements() ,
TypeElement.getEnclosedElements() ,
Elements.getAllMembers(javax.lang.model.element.TypeElement)
boolean equals(Objectobj)
true if the argument represents the same element as
this, or
false otherwise.
Note that the identity of an element involves implicit state not directly accessible from the element's methods, including state about the presence of unrelated types. Element objects created by different implementations of these interfaces should not be expected to be equal even if "the same" element is being modeled; this is analogous to the inequality of Class objects for the same class file loaded through different class loaders.
equals in class
Object
obj - the object to be compared with this element
true if the specified object represents the same element as this
Object.hashCode() ,
HashMap
int hashCode()
Object.hashCode.
hashCode in class
Object
equals(java.lang.Object)
List<? extends AnnotationMirror > getAnnotationMirrors()
To get inherited annotations as well, use getAllAnnotationMirrors.
getAnnotationMirrors in interface
AnnotatedConstruct
<A extends Annotation> A getAnnotation(Class <A> annotationType)
null.
The annotation returned by this method could contain an element whose value is of type Class. This value cannot be returned directly: information necessary to locate and load a class (such as the class loader to use) is not available, and the class might not be loadable at all. Attempting to read a Class object by invoking the relevant method on the returned annotation will result in a MirroredTypeException, from which the corresponding TypeMirror may be extracted. Similarly, attempting to read a Class[]-valued element will result in a MirroredTypesException.
Note: This method is unlike others in this and related interfaces. It operates on runtime reflective information — representations of annotation types currently loaded into the VM — rather than on the representations defined by and used throughout these interfaces. Consequently, calling methods on the returned annotation object can throw many of the exceptions that can be thrown when calling methods on an annotation object returned by core reflection. This method is intended for callers that are written to operate on a known, fixed set of annotation types.
getAnnotation in interface
AnnotatedConstruct
A - the annotation type
annotationType - the
Class object corresponding to the annotation type
null
AnnotatedConstruct.getAnnotationMirrors() ,
AnnotatedElement.getAnnotation(java.lang.Class<T>) ,
EnumConstantNotPresentException,
AnnotationTypeMismatchException,
IncompleteAnnotationException,
MirroredTypeException,
MirroredTypesException
<R,P> R accept(ElementVisitor <R ,P> v, P p)
R - the return type of the visitor's methods
P - the type of the additional parameter to the visitor's methods
v - the visitor operating on this element
p - additional parameter to the visitor