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// 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();
}
}
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