| // Protocol Buffers - Google's data interchange format |
| // Copyright 2008 Google Inc. All rights reserved. |
| // https://developers.google.com/protocol-buffers/ |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| package com.google.protobuf; |
| |
| // TODO(chrisn): Change ContainingType to extend Message |
| /** |
| * Interface that generated extensions implement. |
| * |
| * @author liujisi@google.com (Jisi Liu) |
| */ |
| public abstract class Extension<ContainingType extends MessageLite, Type> |
| extends ExtensionLite<ContainingType, Type> { |
| // TODO(chrisn): Add package-private constructor. |
| |
| /** {@inheritDoc} Overridden to return {@link Message} instead of {@link MessageLite}. */ |
| @Override |
| public abstract Message getMessageDefaultInstance(); |
| |
| /** Returns the descriptor of the extension. */ |
| public abstract Descriptors.FieldDescriptor getDescriptor(); |
| |
| /** Returns whether or not this extension is a Lite Extension. */ |
| @Override |
| final boolean isLite() { |
| return false; |
| } |
| |
| // All the methods below are extension implementation details. |
| |
| /** The API type that the extension is used for. */ |
| protected enum ExtensionType { |
| IMMUTABLE, |
| MUTABLE, |
| PROTO1, |
| } |
| |
| protected abstract ExtensionType getExtensionType(); |
| |
| /** Type of a message extension. */ |
| public enum MessageType { |
| PROTO1, |
| PROTO2, |
| } |
| |
| /** |
| * If the extension is a message extension (i.e., getLiteType() == MESSAGE), returns the type of |
| * the message, otherwise undefined. |
| */ |
| public MessageType getMessageType() { |
| return MessageType.PROTO2; |
| } |
| |
| protected abstract Object fromReflectionType(Object value); |
| |
| protected abstract Object singularFromReflectionType(Object value); |
| |
| protected abstract Object toReflectionType(Object value); |
| |
| protected abstract Object singularToReflectionType(Object value); |
| } |