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 /** 34 * Interface that generated extensions implement. 35 * 36 * @author liujisi@google.com (Jisi Liu) 37 */ 38 public abstract class Extension<ContainingType extends MessageLite, Type> 39 extends ExtensionLite<ContainingType, Type> { 40 41 /** Returns the descriptor of the extension. */ getDescriptor()42 public abstract Descriptors.FieldDescriptor getDescriptor(); 43 44 /** Returns whether or not this extension is a Lite Extension. */ 45 @Override isLite()46 final boolean isLite() { 47 return false; 48 } 49 50 // All the methods below are extension implementation details. 51 52 /** 53 * The API type that the extension is used for. 54 */ 55 protected enum ExtensionType { 56 IMMUTABLE, 57 MUTABLE, 58 PROTO1, 59 } 60 getExtensionType()61 protected ExtensionType getExtensionType() { 62 // TODO(liujisi): make this abstract after we fix proto1. 63 return ExtensionType.IMMUTABLE; 64 } 65 66 /** 67 * Type of a message extension. 68 */ 69 public enum MessageType { 70 PROTO1, 71 PROTO2, 72 } 73 74 /** 75 * If the extension is a message extension (i.e., getLiteType() == MESSAGE), 76 * returns the type of the message, otherwise undefined. 77 */ getMessageType()78 public MessageType getMessageType() { 79 return MessageType.PROTO2; 80 } 81 fromReflectionType(Object value)82 protected abstract Object fromReflectionType(Object value); singularFromReflectionType(Object value)83 protected abstract Object singularFromReflectionType(Object value); toReflectionType(Object value)84 protected abstract Object toReflectionType(Object value); singularToReflectionType(Object value)85 protected abstract Object singularToReflectionType(Object value); 86 } 87