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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;
import com.google.common.collect.ImmutableList;
import com.google.protobuf.CodedInputStream;
import com.google.protobuf.CodedOutputStream;
import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/** {@link ObjectCodec} for {@link HashMap} and {@link java.util.Collections.UnmodifiableMap}. */
class MapCodec<K, V> implements ObjectCodec<Map<K, V>> {
@SuppressWarnings("unchecked")
private static final Class<Map<?, ?>> UNMODIFIABLE_TYPE =
(Class<Map<?, ?>>) Collections.unmodifiableMap(new HashMap<>()).getClass();
@SuppressWarnings("unchecked")
@Override
public Class<Map<K, V>> getEncodedClass() {
return cast(HashMap.class);
}
@Override
public List<Class<? extends Map<K, V>>> additionalEncodedClasses() {
return ImmutableList.of(cast(UNMODIFIABLE_TYPE));
}
@Override
public void serialize(SerializationContext context, Map<K, V> obj, CodedOutputStream codedOut)
throws SerializationException, IOException {
codedOut.writeInt32NoTag(obj.size());
for (Map.Entry<K, V> entry : obj.entrySet()) {
context.serialize(entry.getKey(), codedOut);
context.serialize(entry.getValue(), codedOut);
}
}
@Override
public Map<K, V> deserialize(DeserializationContext context, CodedInputStream codedIn)
throws SerializationException, IOException {
int size = codedIn.readInt32();
// Load factor is 0.75, so we need an initial capacity of 4/3 actual size to avoid rehashing.
LinkedHashMap<K, V> result = new LinkedHashMap<>(4 * size / 3);
for (int i = 0; i < size; i++) {
result.put(context.deserialize(codedIn), context.deserialize(codedIn));
}
return Collections.unmodifiableMap(result);
}
@SuppressWarnings({"unchecked", "rawtypes"}) // Raw Map.
private Class<Map<K, V>> cast(Class<? extends Map> clazz) {
return (Class<Map<K, V>>) clazz;
}
}
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