com.google.devtools.build.lib.collect.IterableCodecs.java Source code

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Here is the source code for com.google.devtools.build.lib.collect.IterableCodecs.java

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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.collect;

import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableList;
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.SerializationContext;
import com.google.devtools.build.lib.skyframe.serialization.SerializationException;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
import com.google.protobuf.CodedInputStream;
import com.google.protobuf.CodedOutputStream;
import java.io.IOException;

@SuppressWarnings("rawtypes")
class IterableCodecs {
    static class FluentIterableCodec implements ObjectCodec<FluentIterable> {
        @Override
        public Class<FluentIterable> getEncodedClass() {
            return FluentIterable.class;
        }

        @Override
        public void serialize(SerializationContext context, FluentIterable obj, CodedOutputStream codedOut)
                throws SerializationException, IOException {
            IterableCodecs.serialize(context, obj, codedOut);
        }

        @Override
        public FluentIterable deserialize(DeserializationContext context, CodedInputStream codedIn)
                throws SerializationException, IOException {
            return FluentIterable.from(IterableCodecs.deserialize(context, codedIn));
        }
    }

    static class IterablesChainCodec implements ObjectCodec<IterablesChain> {
        @Override
        public Class<IterablesChain> getEncodedClass() {
            return IterablesChain.class;
        }

        @Override
        public void serialize(SerializationContext context, IterablesChain obj, CodedOutputStream codedOut)
                throws SerializationException, IOException {
            IterableCodecs.serialize(context, obj, codedOut);
        }

        @Override
        public IterablesChain deserialize(DeserializationContext context, CodedInputStream codedIn)
                throws SerializationException, IOException {
            return new IterablesChain<>(IterableCodecs.deserialize(context, codedIn));
        }
    }

    static class DedupingIterableCodec implements ObjectCodec<DedupingIterable> {
        @Override
        public Class<DedupingIterable> getEncodedClass() {
            return DedupingIterable.class;
        }

        @Override
        public void serialize(SerializationContext context, DedupingIterable obj, CodedOutputStream codedOut)
                throws SerializationException, IOException {
            IterableCodecs.serialize(context, obj, codedOut);
        }

        @Override
        public DedupingIterable deserialize(DeserializationContext context, CodedInputStream codedIn)
                throws SerializationException, IOException {
            return new DedupingIterable<>(IterableCodecs.deserialize(context, codedIn));
        }
    }

    private static void serialize(SerializationContext context, Iterable obj, CodedOutputStream codedOut)
            throws SerializationException, IOException {
        for (Object elt : obj) {
            context.serialize(elt, codedOut);
        }
        context.serialize(DONE, codedOut);
    }

    private static ImmutableList<Object> deserialize(DeserializationContext context, CodedInputStream codedIn)
            throws SerializationException, IOException {
        ImmutableList.Builder<Object> builder = ImmutableList.builder();
        for (Object next = context.deserialize(codedIn); next != DONE; next = context.deserialize(codedIn)) {
            builder.add(next);
        }
        return builder.build();
    }

    /**
     * An object used to mark the end of the sequence of elements.
     *
     * <p>We use this instead of emitting a count to avoid possibly running deduplication twice.
     */
    @AutoCodec
    @AutoCodec.VisibleForSerialization
    static final Object DONE = new Object();
}