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// Copyright (C) 2019 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.extensions.validators;

import com.google.common.collect.ImmutableList;
import com.google.gerrit.extensions.annotations.ExtensionPoint;

/**
 * Validates review comments and messages. Rejecting any comment/message will prevent all comments
 * from being published.
 */
@ExtensionPoint
public interface CommentValidator {

  /**
   * Validate the specified comments. This method will be called once with the {@code comments}
   * argument containing all new comments that need to be validated and (if applicable) the new
   * change message. This allows validators to statelessly count the new comments. Note that after
   * this one call the method may be called again one or more times for texts that are not comments,
   * but similar in nature.
   *
   * NOTE: Autogenerated change messages are not subject to validation.
   *
   * @return An empty list if all comments are valid, or else a list of validation failures.
   */
  ImmutableList validateComments(
      CommentValidationContext ctx, ImmutableList comments);
}