1 /* 2 * Copyright 2017, Google Inc. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 package com.google.api.core; 31 32 import java.lang.annotation.Documented; 33 import java.lang.annotation.ElementType; 34 import java.lang.annotation.Retention; 35 import java.lang.annotation.RetentionPolicy; 36 import java.lang.annotation.Target; 37 38 /** 39 * Indicates a public API that is stable for callers to use, but has no guarantee of stability for 40 * extension. Consequently, the API should only be extended within the package containing the API. 41 * 42 * <p>For example: 43 * 44 * <ul> 45 * <li>An interface marked with this annotation can have new methods added to it. 46 * <li>A non-final class with this annotation can be marked final. 47 * <li>A class with this annotation can have new abstract methods added. 48 * <li>a non-final method with this annotation can be marked final. 49 * </ul> 50 * 51 * <p>The list above is just for illustration purposes and is not exhaustive. 52 * 53 * <p>Adding this annotation to an API is considered API-breaking. 54 */ 55 @BetaApi 56 @Retention(RetentionPolicy.RUNTIME) 57 @Target({ 58 ElementType.ANNOTATION_TYPE, 59 ElementType.CONSTRUCTOR, 60 ElementType.FIELD, 61 ElementType.METHOD, 62 ElementType.PACKAGE, 63 ElementType.TYPE 64 }) 65 @Documented 66 public @interface InternalExtensionOnly { 67 /** Context information on why the interface/class is annotated with InternalExtensionOnly. */ value()68 String value() default ""; 69 } 70