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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.ImmutableMap;
import com.google.common.collect.ImmutableSortedMap;
import com.google.common.collect.Ordering;
import com.google.protobuf.CodedInputStream;
import com.google.protobuf.CodedOutputStream;
import java.io.IOException;
import java.util.Comparator;
import java.util.Map;
/**
* Encodes an {@link ImmutableMap}, which may be an ImmutableSortedMap. We handle both here because
* we cannot handle ImmutableSortedMap with any ordering other than the default, and so we degrade
* to ImmutableMap in that case, hoping that the caller does not notice.
*/
class ImmutableMapCodec implements ObjectCodec<ImmutableMap<?, ?>> {
@SuppressWarnings("unchecked")
@Override
public Class<ImmutableMap<?, ?>> getEncodedClass() {
// Because Java disallows converting from Class<ImmutableMap> to Class<ImmutableMap<?, ?>>
// directly.
return (Class<ImmutableMap<?, ?>>) ((Class<?>) ImmutableMap.class);
}
@Override
public void serialize(
SerializationContext context, ImmutableMap<?, ?> map, CodedOutputStream codedOut)
throws SerializationException, IOException {
codedOut.writeInt32NoTag(map.size());
boolean serializeAsSortedMap = false;
if (map instanceof ImmutableSortedMap) {
Comparator<?> comparator = ((ImmutableSortedMap<?, ?>) map).comparator();
// In practice the comparator seems to always be Ordering.natural(), but be flexible.
serializeAsSortedMap =
comparator.equals(Ordering.natural()) || comparator.equals(Comparator.naturalOrder());
}
codedOut.writeBoolNoTag(serializeAsSortedMap);
for (Map.Entry<?, ?> entry : map.entrySet()) {
context.serialize(entry.getKey(), codedOut);
context.serialize(entry.getValue(), codedOut);
}
}
@Override
public ImmutableMap<?, ?> deserialize(DeserializationContext context, CodedInputStream codedIn)
throws SerializationException, IOException {
int length = codedIn.readInt32();
if (length < 0) {
throw new SerializationException("Expected non-negative length: " + length);
}
if (codedIn.readBool()) {
return buildMap(ImmutableSortedMap.naturalOrder(), length, context, codedIn);
} else {
return buildMap(ImmutableMap.builderWithExpectedSize(length), length, context, codedIn);
}
}
private static <T> ImmutableMap<T, Object> buildMap(
ImmutableMap.Builder<T, Object> builder,
int length,
DeserializationContext context,
CodedInputStream codedIn)
throws IOException, SerializationException {
for (int i = 0; i < length; i++) {
T key = context.deserialize(codedIn);
Object value = context.deserialize(codedIn);
builder.put(key, value);
}
try {
return builder.build();
} catch (IllegalArgumentException e) {
throw new SerializationException(
"Duplicate keys during ImmutableMapCodec deserialization", e);
}
}
}
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