| // Copyright 2017 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 java.io.IOException; |
| |
| /** Encodes a list of elements using a specified {@link ObjectCodec}. */ |
| public class ImmutableListCodec<T> implements ObjectCodec<ImmutableList<T>> { |
| |
| private final ObjectCodec<T> codec; |
| |
| ImmutableListCodec(ObjectCodec<T> codec) { |
| this.codec = codec; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public Class<ImmutableList<T>> getEncodedClass() { |
| // Compiler doesn't like cast from Class<ImmutableList> -> Class<ImmutableList<T>>, but it |
| // does allow what we see below. Type is lost at runtime anyway, so while gross this works. |
| return (Class<ImmutableList<T>>) ((Class<?>) ImmutableList.class); |
| } |
| |
| @Override |
| public void serialize( |
| SerializationContext context, ImmutableList<T> list, CodedOutputStream codedOut) |
| throws SerializationException, IOException { |
| codedOut.writeInt32NoTag(list.size()); |
| for (T item : list) { |
| codec.serialize(context, item, codedOut); |
| } |
| } |
| |
| @Override |
| public ImmutableList<T> deserialize(DeserializationContext context, CodedInputStream codedIn) |
| throws SerializationException, IOException { |
| int length = codedIn.readInt32(); |
| if (length < 0) { |
| throw new SerializationException("Expected non-negative length: " + length); |
| } |
| |
| ImmutableList.Builder<T> builder = ImmutableList.builder(); |
| for (int i = 0; i < length; i++) { |
| builder.add(codec.deserialize(context, codedIn)); |
| } |
| return builder.build(); |
| } |
| } |