1 /* 2 * Copyright (c) 2003, 2004, Oracle and/or its affiliates. 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * 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 { value()67 ElementType[] value(); 68 } 69