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88 lines
2.4 KiB
88 lines
2.4 KiB
/*
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* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.lang.annotation;
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/**
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* Indicates the contexts in which an annotation type is applicable. The
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* declaration contexts and type contexts in which an annotation type may be
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* applicable are specified in JLS 9.6.4.1, and denoted in source code by enum
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* constants of {@link ElementType java.lang.annotation.ElementType}.
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*
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* <p>If an {@code @Target} meta-annotation is not present on an annotation type
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* {@code T} , then an annotation of type {@code T} may be written as a
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* modifier for any declaration except a type parameter declaration.
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*
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* <p>If an {@code @Target} meta-annotation is present, the compiler will enforce
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* the usage restrictions indicated by {@code ElementType}
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* enum constants, in line with JLS 9.7.4.
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*
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* <p>For example, this {@code @Target} meta-annotation indicates that the
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* declared type is itself a meta-annotation type. It can only be used on
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* annotation type declarations:
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* <pre>
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* @Target(ElementType.ANNOTATION_TYPE)
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* public @interface MetaAnnotationType {
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* ...
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* }
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* </pre>
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*
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* <p>This {@code @Target} meta-annotation indicates that the declared type is
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* intended solely for use as a member type in complex annotation type
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* declarations. It cannot be used to annotate anything directly:
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* <pre>
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* @Target({})
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* public @interface MemberType {
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* ...
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* }
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* </pre>
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*
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* <p>It is a compile-time error for a single {@code ElementType} constant to
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* appear more than once in an {@code @Target} annotation. For example, the
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* following {@code @Target} meta-annotation is illegal:
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* <pre>
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* @Target({ElementType.FIELD, ElementType.METHOD, ElementType.FIELD})
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* public @interface Bogus {
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* ...
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* }
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* </pre>
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*
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* @since 1.5
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* @jls 9.6.4.1 @Target
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* @jls 9.7.4 Where Annotations May Appear
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*/
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@Documented
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@Retention(RetentionPolicy.RUNTIME)
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@Target(ElementType.ANNOTATION_TYPE)
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public @interface Target {
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/**
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* Returns an array of the kinds of elements an annotation type
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* can be applied to.
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* @return an array of the kinds of elements an annotation type
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* can be applied to
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*/
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ElementType[] value();
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}
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