| // Copyright 2018 The Bazel Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.devtools.build.lib.skyframe.serialization; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.protobuf.CodedInputStream; |
| import com.google.protobuf.CodedOutputStream; |
| import com.google.protobuf.ExtensionRegistryLite; |
| import com.google.protobuf.InvalidProtocolBufferException; |
| import com.google.protobuf.MessageLite; |
| import com.google.protobuf.UnknownFieldSet; |
| import java.io.IOException; |
| import java.lang.reflect.Method; |
| |
| /** Codec for protos. */ |
| public final class MessageLiteCodec extends LeafObjectCodec<MessageLite> { |
| |
| private final Class<? extends MessageLite> type; |
| |
| /** Instantiates {@link MessageLite.Builder} via {@link MessageLite#newBuilderForType}. */ |
| private final MessageLite defaultInstance; |
| |
| public MessageLiteCodec(Class<? extends MessageLite> type) { |
| this.type = type; |
| try { |
| Method m = type.getMethod("getDefaultInstance"); |
| this.defaultInstance = (MessageLite) m.invoke(null); |
| } catch (ReflectiveOperationException e) { |
| throw new IllegalArgumentException("Invalid proto class " + type.getCanonicalName(), e); |
| } |
| } |
| |
| @Override |
| public Class<? extends MessageLite> getEncodedClass() { |
| return type; |
| } |
| |
| @Override |
| public void serialize( |
| SerializationDependencyProvider dependencies, MessageLite message, CodedOutputStream codedOut) |
| throws IOException { |
| codedOut.writeMessageNoTag(message); |
| } |
| |
| @Override |
| public MessageLite deserialize( |
| SerializationDependencyProvider dependencies, CodedInputStream codedIn) |
| throws IOException, SerializationException { |
| // Don't hold on to full byte array when constructing this proto. |
| codedIn.enableAliasing(false); |
| try { |
| MessageLite.Builder builder = defaultInstance.newBuilderForType(); |
| codedIn.readMessage(builder, ExtensionRegistryLite.getEmptyRegistry()); |
| return builder.build(); |
| } catch (InvalidProtocolBufferException e) { |
| throw new SerializationException("Failed to parse proto of type " + type, e); |
| } finally { |
| codedIn.enableAliasing(true); |
| } |
| } |
| |
| @SuppressWarnings("unused") // Used reflectively. |
| private static class MessageLiteCodecRegisterer implements CodecRegisterer { |
| @Override |
| public ImmutableList<ObjectCodec<?>> getCodecsToRegister() { |
| return ImmutableList.of(new MessageLiteCodec(UnknownFieldSet.class)); |
| } |
| } |
| } |