src/main/java/com/google/devtools/build/lib/skyframe/serialization/OptionalConstants.java

// Copyright 2023 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.skyframe.serialization.autocodec.SerializationConstant;
import com.google.errorprone.annotations.Keep;

/**
 * Declares serialization constants for empty optionals.
 *
 * <p>Upstream library constants cannot be annotated directly.
 */
@Keep
@SuppressWarnings("rawtypes")
final class OptionalConstants {

  @SerializationConstant
  static final java.util.Optional EMPTY_JDK_OPTIONAL = java.util.Optional.empty();

  @SerializationConstant
  static final com.google.common.base.Optional EMPTY_GUAVA_OPTIONAL =
      com.google.common.base.Optional.absent();

  private OptionalConstants() {}
}