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// 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.serializers;
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.Serializer;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
import com.google.common.collect.HashBasedTable;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableTable;
import com.google.common.collect.Lists;
import com.google.common.collect.Table;
/** A {@link Serializer} for {@link ImmutableList}. */
class ImmutableListSerializer extends Serializer<ImmutableList<Object>> {
private ImmutableListSerializer() {
setImmutable(true);
}
@Override
public void write(Kryo kryo, Output output, ImmutableList<Object> object) {
output.writeInt(object.size(), true);
for (Object elm : object) {
kryo.writeClassAndObject(output, elm);
}
}
@Override
public ImmutableList<Object> read(Kryo kryo, Input input, Class<ImmutableList<Object>> type) {
int size = input.readInt(true);
Object[] list = new Object[size];
for (int i = 0; i < size; ++i) {
list[i] = kryo.readClassAndObject(input);
}
return ImmutableList.copyOf(list);
}
/**
* Creates a new {@link ImmutableListSerializer} and registers its serializer for the several
* ImmutableList related classes.
*
* @param kryo the {@link Kryo} instance to set the serializer on
*/
static void registerSerializers(Kryo kryo) {
// ImmutableList (abstract class)
// +- RegularImmutableList
// | RegularImmutableList
// +- SingletonImmutableList
// | Optimized for List with only 1 element.
// +- SubList
// | Representation for part of ImmutableList
// +- ReverseImmutableList
// | For iterating in reverse order
// +- StringAsImmutableList
// | Used by Lists#charactersOf
// +- Values (ImmutableTable values)
// Used by return value of #values() when there are multiple cells
ImmutableListSerializer serializer = new ImmutableListSerializer();
kryo.register(ImmutableList.class, serializer);
// Note:
// Only registering above is good enough for serializing/deserializing.
// but if using Kryo#copy, following is required.
kryo.register(ImmutableList.of().getClass(), serializer);
kryo.register(ImmutableList.of(1).getClass(), serializer);
kryo.register(ImmutableList.of(1, 2).getClass(), serializer);
kryo.register(ImmutableList.of(1, 2, 3, 4).subList(1, 3).getClass(), serializer);
kryo.register(ImmutableList.of(1, 2).reverse().getClass(), serializer);
kryo.register(Lists.charactersOf("KryoRocks").getClass(), serializer);
Table<Integer, Integer, Integer> baseTable = HashBasedTable.create();
baseTable.put(1, 2, 3);
baseTable.put(4, 5, 6);
Table<Integer, Integer, Integer> table = ImmutableTable.copyOf(baseTable);
kryo.register(table.values().getClass(), serializer);
}
}
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