| J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2004 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package java.lang.annotation; |
| 27 | |
| 28 | /** |
| 29 | * Indicates the kinds of program element to which an annotation type |
| 30 | * is applicable. If a Target meta-annotation is not present on an |
| 31 | * annotation type declaration, the declared type may be used on any |
| 32 | * program element. If such a meta-annotation is present, the compiler |
| 33 | * will enforce the specified usage restriction. |
| 34 | * |
| 35 | * For example, this meta-annotation indicates that the declared type is |
| 36 | * itself a meta-annotation type. It can only be used on annotation type |
| 37 | * declarations: |
| 38 | * <pre> |
| 39 | * @Target(ElementType.ANNOTATION_TYPE) |
| 40 | * public @interface MetaAnnotationType { |
| 41 | * ... |
| 42 | * } |
| 43 | * </pre> |
| 44 | * This meta-annotation indicates that the declared type is intended solely |
| 45 | * for use as a member type in complex annotation type declarations. It |
| 46 | * cannot be used to annotate anything directly: |
| 47 | * <pre> |
| 48 | * @Target({}) |
| 49 | * public @interface MemberType { |
| 50 | * ... |
| 51 | * } |
| 52 | * </pre> |
| 53 | * It is a compile-time error for a single ElementType constant to |
| 54 | * appear more than once in a Target annotation. For example, the |
| 55 | * following meta-annotation is illegal: |
| 56 | * <pre> |
| 57 | * @Target({ElementType.FIELD, ElementType.METHOD, ElementType.FIELD}) |
| 58 | * public @interface Bogus { |
| 59 | * ... |
| 60 | * } |
| 61 | * </pre> |
| 62 | */ |
| 63 | @Documented |
| 64 | @Retention(RetentionPolicy.RUNTIME) |
| 65 | @Target(ElementType.ANNOTATION_TYPE) |
| 66 | public @interface Target { |
| 67 | ElementType[] value(); |
| 68 | } |