Target


1   /*
2    * @(#)Target.java  1.5 04/06/22
3    *
4    * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
5    * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6    */
7   
8   package java.lang.annotation;
9   
10  /**
11   * Indicates the kinds of program element to which an annotation type
12   * is applicable.  If a Target meta-annotation is not present on an
13   * annotation type declaration, the declared type may be used on any
14   * program element.  If such a meta-annotation is present, the compiler
15   * will enforce the specified usage restriction.
16   *
17   * For example, this meta-annotation indicates that the declared type is
18   * itself a meta-annotation type.  It can only be used on annotation type
19   * declarations:
20   * <pre>
21   *    &#064;Target(ElementType.ANNOTATION_TYPE)
22   *    public &#064;interface MetaAnnotationType {
23   *        ... 
24   *    }
25   * </pre>
26   * This meta-annotation indicates that the declared type is intended solely
27   * for use as a member type in complex annotation type declarations.  It
28   * cannot be used to annotate anything directly:
29   * <pre>
30   *    &#064;Target({}) 
31   *    public &#064;interface MemberType {
32   *        ...
33   *    }
34   * </pre>
35   * It is a compile-time error for a single ElementType constant to
36   * appear more than once in a Target annotation.  For example, the
37   * following meta-annotation is illegal:
38   * <pre>
39   *    &#064;Target({ElementType.FIELD, ElementType.METHOD, ElementType.FIELD})
40   *    public &#064;interface Bogus {
41   *        ...
42   *    }
43   * </pre>
44   */
45  @Documented  
46  @Retention  (RetentionPolicy.RUNTIME)
47  @Target  (ElementType.ANNOTATION_TYPE)
48  public @interface Target {
49      ElementType  [] value();
50  }
51
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