src/main/java/com/code_intelligence/jazzer/mutation/mutator/proto/MessageMutatorFactory.java


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/*
 * Copyright 2023 Code Intelligence GmbH
 *
 * 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.code_intelligence.jazzer.mutation.mutator.proto;

import static com.code_intelligence.jazzer.mutation.combinator.MutatorCombinators.mutateThenMapToImmutable;
import static com.code_intelligence.jazzer.mutation.support.TypeSupport.asAnnotatedType;
import static com.code_intelligence.jazzer.mutation.support.TypeSupport.asSubclassOrEmpty;
import static com.code_intelligence.jazzer.mutation.support.TypeSupport.withExtraAnnotations;

import com.code_intelligence.jazzer.mutation.api.MutatorFactory;
import com.code_intelligence.jazzer.mutation.api.SerializingMutator;
import com.google.protobuf.Message;
import com.google.protobuf.Message.Builder;
import java.lang.reflect.AnnotatedType;
import java.util.Arrays;
import java.util.Optional;

public final class MessageMutatorFactory extends MutatorFactory {
  @Override
  public Optional<SerializingMutator<?>> tryCreate(
      AnnotatedType messageType, MutatorFactory factory) {
    return asSubclassOrEmpty(messageType, Message.class)
        // If the Message class doesn't have a nested Builder class, it is not a concrete generated
        // message and we can't mutate it.
        .flatMap(messageClass
            -> Arrays.stream(messageClass.getDeclaredClasses())
                   .filter(clazz -> clazz.getSimpleName().equals("Builder"))
                   .findFirst())
        .flatMap(builderClass
            ->
            // Forward the annotations (e.g. @NotNull) on the Message type to the Builder type.
            factory.tryCreateInPlace(
                withExtraAnnotations(asAnnotatedType(builderClass), messageType.getAnnotations())))
        .map(builderMutator
            -> mutateThenMapToImmutable(
                (SerializingMutator<Builder>) builderMutator, Builder::build, Message::toBuilder));
  }
}