| // 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.common.collect.ImmutableMultimap; |
| import com.google.common.collect.ImmutableSet; |
| import com.google.common.collect.Iterables; |
| import com.google.common.collect.LinkedHashMultimap; |
| import com.google.common.collect.Sets; |
| import com.google.protobuf.CodedInputStream; |
| import com.google.protobuf.CodedOutputStream; |
| import java.io.IOException; |
| import java.util.Collections; |
| import java.util.Set; |
| |
| /** {@link ObjectCodec} for {@link ImmutableSet} and other sets that should be immutable. */ |
| @SuppressWarnings("rawtypes") // Intentional erasure of ImmutableSet. |
| final class ImmutableSetRuntimeCodec implements ObjectCodec<Set> { |
| @SuppressWarnings("unchecked") |
| private static final Class<Set> LINKED_HASH_MULTIMAP_CLASS = |
| (Class<Set>) LinkedHashMultimap.create(ImmutableMultimap.of("a", "b")).get("a").getClass(); |
| |
| @SuppressWarnings("unchecked") |
| private static final Class<Set> SINGLETON_SET_CLASS = |
| (Class<Set>) Collections.singleton("a").getClass(); |
| |
| @SuppressWarnings("unchecked") |
| private static final Class<Set> SUBSET_CLASS = |
| (Class<Set>) Iterables.getOnlyElement(Sets.powerSet(ImmutableSet.of())).getClass(); |
| |
| @SuppressWarnings("unchecked") |
| private static final Class<Set> EMPTY_SET_CLASS = (Class<Set>) Collections.emptySet().getClass(); |
| |
| @Override |
| public Class<ImmutableSet> getEncodedClass() { |
| return ImmutableSet.class; |
| } |
| |
| @Override |
| public ImmutableList<Class<? extends Set>> additionalEncodedClasses() { |
| return ImmutableList.of( |
| LINKED_HASH_MULTIMAP_CLASS, SINGLETON_SET_CLASS, EMPTY_SET_CLASS, SUBSET_CLASS); |
| } |
| |
| @Override |
| public void serialize(SerializationContext context, Set object, CodedOutputStream codedOut) |
| throws SerializationException, IOException { |
| codedOut.writeInt32NoTag(object.size()); |
| for (Object obj : object) { |
| context.serialize(obj, codedOut); |
| } |
| } |
| |
| @SuppressWarnings("unchecked") // Adding object to untyped builder. |
| @Override |
| public ImmutableSet deserialize(DeserializationContext context, CodedInputStream codedIn) |
| throws SerializationException, IOException { |
| int size = codedIn.readInt32(); |
| ImmutableSet.Builder builder = ImmutableSet.builderWithExpectedSize(size); |
| for (int i = 0; i < size; i++) { |
| // Don't inline so builder knows this is an object, not an array. |
| Object item = context.deserialize(codedIn); |
| builder.add(item); |
| } |
| return builder.build(); |
| } |
| } |