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// Copyright (C) 2021 The Android Open Source Project
//
// 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.gerrit.entities;

import com.google.auto.value.AutoValue;
import com.google.common.base.Strings;
import com.google.gerrit.common.Nullable;
import com.google.gson.Gson;
import com.google.gson.TypeAdapter;
import java.util.Optional;

/** Describe a applicability, blocking or override expression of a {@link SubmitRequirement}. */
@AutoValue
public abstract class SubmitRequirementExpression {

  public static SubmitRequirementExpression create(String expression) {
    return new AutoValue_SubmitRequirementExpression(expression);
  }

  /**
   * Creates a new {@link SubmitRequirementExpression}.
   *
   * @param expression String representation of the expression
   * @return empty {@link Optional} if the input expression is null or empty, or an Optional
   *     containing the expression otherwise.
   */
  public static Optional of(@Nullable String expression) {
    return Optional.ofNullable(Strings.emptyToNull(expression))
        .map(SubmitRequirementExpression::create);
  }

  /** Returns the underlying String representing this {@link SubmitRequirementExpression}. */
  public abstract String expressionString();

  public static TypeAdapter typeAdapter(Gson gson) {
    return new AutoValue_SubmitRequirementExpression.GsonTypeAdapter(gson);
  }

  /**
   * Returns a "submit requirement" expression that requires the maximum vote on the Code-Review
   * label.
   */
  public static SubmitRequirementExpression maxCodeReview() {
    return SubmitRequirementExpression.create(String.format("label:Code-Review=MAX"));
  }
}




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