1 // Protocol Buffers - Google's data interchange format 2 // Copyright 2008 Google Inc. All rights reserved. 3 // https://developers.google.com/protocol-buffers/ 4 // 5 // Redistribution and use in source and binary forms, with or without 6 // modification, are permitted provided that the following conditions are 7 // met: 8 // 9 // * Redistributions of source code must retain the above copyright 10 // notice, this list of conditions and the following disclaimer. 11 // * Redistributions in binary form must reproduce the above 12 // copyright notice, this list of conditions and the following disclaimer 13 // in the documentation and/or other materials provided with the 14 // distribution. 15 // * Neither the name of Google Inc. nor the names of its 16 // contributors may be used to endorse or promote products derived from 17 // this software without specific prior written permission. 18 // 19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 31 package com.google.protobuf; 32 33 // TODO(chrisn): Change ContainingType to extend Message 34 /** 35 * Interface that generated extensions implement. 36 * 37 * @author liujisi@google.com (Jisi Liu) 38 */ 39 public abstract class Extension<ContainingType extends MessageLite, Type> 40 extends ExtensionLite<ContainingType, Type> { 41 // TODO(chrisn): Add package-private constructor. 42 43 /** {@inheritDoc} Overridden to return {@link Message} instead of {@link MessageLite}. */ 44 @Override getMessageDefaultInstance()45 public abstract Message getMessageDefaultInstance(); 46 47 /** Returns the descriptor of the extension. */ getDescriptor()48 public abstract Descriptors.FieldDescriptor getDescriptor(); 49 50 /** Returns whether or not this extension is a Lite Extension. */ 51 @Override isLite()52 final boolean isLite() { 53 return false; 54 } 55 56 // All the methods below are extension implementation details. 57 58 /** The API type that the extension is used for. */ 59 protected enum ExtensionType { 60 IMMUTABLE, 61 MUTABLE, 62 PROTO1, 63 } 64 getExtensionType()65 protected abstract ExtensionType getExtensionType(); 66 67 /** Type of a message extension. */ 68 public enum MessageType { 69 PROTO1, 70 PROTO2, 71 } 72 73 /** 74 * If the extension is a message extension (i.e., getLiteType() == MESSAGE), returns the type of 75 * the message, otherwise undefined. 76 */ getMessageType()77 public MessageType getMessageType() { 78 return MessageType.PROTO2; 79 } 80 fromReflectionType(Object value)81 protected abstract Object fromReflectionType(Object value); 82 singularFromReflectionType(Object value)83 protected abstract Object singularFromReflectionType(Object value); 84 toReflectionType(Object value)85 protected abstract Object toReflectionType(Object value); 86 singularToReflectionType(Object value)87 protected abstract Object singularToReflectionType(Object value); 88 } 89