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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.collect.nestedset;
import com.google.devtools.build.lib.skyframe.serialization.DeserializationContext;
import com.google.devtools.build.lib.skyframe.serialization.ObjectCodec;
import com.google.devtools.build.lib.skyframe.serialization.SerializationConstants;
import com.google.devtools.build.lib.skyframe.serialization.SerializationContext;
import com.google.devtools.build.lib.skyframe.serialization.SerializationException;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
import com.google.protobuf.ByteString;
import com.google.protobuf.CodedInputStream;
import com.google.protobuf.CodedOutputStream;
import java.io.IOException;
/**
* Codec for {@link NestedSet} that uses the {@link NestedSetStore}.
*
* <p>Currently not used in favor of an @{@link AutoCodec}-ed NestedSet. Disabled by just not ending
* in "Codec".
*/
public class NestedSetCodecWithStore<T> implements ObjectCodec<NestedSet<T>> {
private final NestedSetStore nestedSetStore;
/** Creates a NestedSetCodecWithStore that will use the given {@link NestedSetStore}. */
public NestedSetCodecWithStore(NestedSetStore nestedSetStore) {
this.nestedSetStore = nestedSetStore;
}
@SuppressWarnings("unchecked")
@Override
public Class<NestedSet<T>> getEncodedClass() {
// Compiler doesn't like cast from Class<NestedSet> -> Class<NestedSet<T>>, but it
// does allow what we see below. Type is lost at runtime anyway, so while gross this works.
return (Class<NestedSet<T>>) ((Class<?>) NestedSet.class);
}
@Override
public void serialize(SerializationContext context, NestedSet<T> obj, CodedOutputStream codedOut)
throws SerializationException, IOException {
if (!SerializationConstants.shouldSerializeNestedSet) {
// Don't perform NestedSet serialization in testing
return;
}
context.serialize(obj.getOrder(), codedOut);
// If the NestedSet is empty, it needs to be assigned to the EMPTY_CHILDREN constant on
// deserialization.
codedOut.writeBoolNoTag(obj.isEmpty());
if (obj.isEmpty()) {
return;
}
// If the NestedSet is a singleton, we serialize directly as an optimization.
codedOut.writeBoolNoTag(obj.isSingleton());
if (obj.isSingleton()) {
context.serialize(obj.rawChildren(), codedOut);
return;
}
ByteString fingerprint =
nestedSetStore.computeFingerprintAndStore((Object[]) obj.rawChildren(), context);
codedOut.writeByteArrayNoTag(fingerprint.toByteArray());
}
@Override
public NestedSet<T> deserialize(DeserializationContext context, CodedInputStream codedIn)
throws SerializationException, IOException {
if (!SerializationConstants.shouldSerializeNestedSet) {
// Don't perform NestedSet deserialization in testing
return NestedSetBuilder.emptySet(Order.STABLE_ORDER);
}
Order order = context.deserialize(codedIn);
boolean isEmpty = codedIn.readBool();
if (isEmpty) {
return NestedSetBuilder.emptySet(order);
}
boolean isSingleton = codedIn.readBool();
if (isSingleton) {
T contents = context.deserialize(codedIn);
return new NestedSet<T>(order, contents);
}
ByteString fingerprint = ByteString.copyFrom(codedIn.readByteArray());
Object members = nestedSetStore.getContentsAndDeserialize(fingerprint, context);
return new NestedSet<>(order, members);
}
}
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