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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.devtools.build.lib.unsafe.UnsafeProvider;
import com.google.protobuf.CodedInputStream;
import com.google.protobuf.CodedOutputStream;
import java.io.IOException;
import java.util.EnumMap;
import java.util.Map;
import sun.misc.Unsafe;
/**
* Serialize {@link EnumMap}. Subclasses of {@link EnumMap} will crash at runtime because currently
* there are no "benign" subclasses of {@link EnumMap} in the Bazel codebase that can be used where
* an {@link EnumMap} was expected.
*/
class EnumMapCodec<E extends Enum<E>, V> implements ObjectCodec<EnumMap<E, V>> {
// Only needed for empty EnumMaps where we can't figure out the Enum class from a sample element.
private final long classTypeOffset;
EnumMapCodec() {
try {
classTypeOffset =
UnsafeProvider.getInstance().objectFieldOffset(EnumMap.class.getDeclaredField("keyType"));
} catch (NoSuchFieldException e) {
throw new IllegalStateException("Couldn't get keyType field fron EnumMap", e);
}
}
@SuppressWarnings("unchecked")
@Override
public Class<EnumMap<E, V>> getEncodedClass() {
return (Class<EnumMap<E, V>>) (Class<?>) EnumMap.class;
}
@Override
public void serialize(SerializationContext context, EnumMap<E, V> obj, CodedOutputStream codedOut)
throws SerializationException, IOException {
if (!obj.getClass().equals(EnumMap.class)) {
throw new SerializationException(
"Cannot serialize subclasses of EnumMap: " + obj.getClass() + " (" + obj + ")");
}
codedOut.writeInt32NoTag(obj.size());
if (obj.isEmpty()) {
// Do gross hack to get key type of map, since we have no concrete element to examine.
Unsafe unsafe = UnsafeProvider.getInstance();
context.serialize(unsafe.getObject(obj, classTypeOffset), codedOut);
return;
}
context.serialize(obj.keySet().iterator().next().getDeclaringClass(), codedOut);
for (Map.Entry<E, V> entry : obj.entrySet()) {
codedOut.writeInt32NoTag(entry.getKey().ordinal());
context.serialize(entry.getValue(), codedOut);
}
}
@Override
public EnumMap<E, V> deserialize(DeserializationContext context, CodedInputStream codedIn)
throws SerializationException, IOException {
int size = codedIn.readInt32();
Class<E> clazz = context.deserialize(codedIn);
EnumMap<E, V> result = new EnumMap<>(clazz);
E[] enums = clazz.getEnumConstants();
for (int i = 0; i < size; i++) {
int ordinal = codedIn.readInt32();
V val = context.deserialize(codedIn);
result.put(enums[ordinal], val);
}
return result;
}
}
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