| // 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; |
| |
| import static com.google.protobuf.Internal.checkNotNull; |
| |
| /** |
| * Dynamically generates a manifest-based (i.e. table-based) schema for a given protobuf message. |
| */ |
| @ExperimentalApi |
| final class ManifestSchemaFactory implements SchemaFactory { |
| |
| private final MessageInfoFactory messageInfoFactory; |
| |
| public ManifestSchemaFactory() { |
| this(getDefaultMessageInfoFactory()); |
| } |
| |
| private ManifestSchemaFactory(MessageInfoFactory messageInfoFactory) { |
| this.messageInfoFactory = checkNotNull(messageInfoFactory, "messageInfoFactory"); |
| } |
| |
| @Override |
| public <T> Schema<T> createSchema(Class<T> messageType) { |
| SchemaUtil.requireGeneratedMessage(messageType); |
| |
| MessageInfo messageInfo = messageInfoFactory.messageInfoFor(messageType); |
| |
| // MessageSet has a special schema. |
| if (messageInfo.isMessageSetWireFormat()) { |
| if (GeneratedMessageLite.class.isAssignableFrom(messageType)) { |
| return MessageSetSchema.newSchema( |
| SchemaUtil.unknownFieldSetLiteSchema(), |
| ExtensionSchemas.lite(), |
| messageInfo.getDefaultInstance()); |
| } |
| return MessageSetSchema.newSchema( |
| SchemaUtil.proto2UnknownFieldSetSchema(), |
| ExtensionSchemas.full(), |
| messageInfo.getDefaultInstance()); |
| } |
| |
| return newSchema(messageType, messageInfo); |
| } |
| |
| private static <T> Schema<T> newSchema(Class<T> messageType, MessageInfo messageInfo) { |
| if (GeneratedMessageLite.class.isAssignableFrom(messageType)) { |
| return isProto2(messageInfo) |
| ? MessageSchema.newSchema( |
| messageType, |
| messageInfo, |
| NewInstanceSchemas.lite(), |
| ListFieldSchema.lite(), |
| SchemaUtil.unknownFieldSetLiteSchema(), |
| ExtensionSchemas.lite(), |
| MapFieldSchemas.lite()) |
| : MessageSchema.newSchema( |
| messageType, |
| messageInfo, |
| NewInstanceSchemas.lite(), |
| ListFieldSchema.lite(), |
| SchemaUtil.unknownFieldSetLiteSchema(), |
| /* extensionSchema= */ null, |
| MapFieldSchemas.lite()); |
| } |
| return isProto2(messageInfo) |
| ? MessageSchema.newSchema( |
| messageType, |
| messageInfo, |
| NewInstanceSchemas.full(), |
| ListFieldSchema.full(), |
| SchemaUtil.proto2UnknownFieldSetSchema(), |
| ExtensionSchemas.full(), |
| MapFieldSchemas.full()) |
| : MessageSchema.newSchema( |
| messageType, |
| messageInfo, |
| NewInstanceSchemas.full(), |
| ListFieldSchema.full(), |
| SchemaUtil.proto3UnknownFieldSetSchema(), |
| /* extensionSchema= */ null, |
| MapFieldSchemas.full()); |
| } |
| |
| private static boolean isProto2(MessageInfo messageInfo) { |
| return messageInfo.getSyntax() == ProtoSyntax.PROTO2; |
| } |
| |
| private static MessageInfoFactory getDefaultMessageInfoFactory() { |
| return new CompositeMessageInfoFactory( |
| GeneratedMessageInfoFactory.getInstance(), getDescriptorMessageInfoFactory()); |
| } |
| |
| private static class CompositeMessageInfoFactory implements MessageInfoFactory { |
| private MessageInfoFactory[] factories; |
| |
| CompositeMessageInfoFactory(MessageInfoFactory... factories) { |
| this.factories = factories; |
| } |
| |
| @Override |
| public boolean isSupported(Class<?> clazz) { |
| for (MessageInfoFactory factory : factories) { |
| if (factory.isSupported(clazz)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public MessageInfo messageInfoFor(Class<?> clazz) { |
| for (MessageInfoFactory factory : factories) { |
| if (factory.isSupported(clazz)) { |
| return factory.messageInfoFor(clazz); |
| } |
| } |
| throw new UnsupportedOperationException( |
| "No factory is available for message type: " + clazz.getName()); |
| } |
| } |
| |
| private static final MessageInfoFactory EMPTY_FACTORY = |
| new MessageInfoFactory() { |
| @Override |
| public boolean isSupported(Class<?> clazz) { |
| return false; |
| } |
| |
| @Override |
| public MessageInfo messageInfoFor(Class<?> clazz) { |
| throw new IllegalStateException("This should never be called."); |
| } |
| }; |
| |
| private static MessageInfoFactory getDescriptorMessageInfoFactory() { |
| try { |
| Class<?> clazz = Class.forName("com.google.protobuf.DescriptorMessageInfoFactory"); |
| return (MessageInfoFactory) clazz.getDeclaredMethod("getInstance").invoke(null); |
| } catch (Exception e) { |
| return EMPTY_FACTORY; |
| } |
| } |
| } |