content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.kafka.controller;
  
  import org.apache.kafka.common.protocol.Errors;
  import org.apache.kafka.common.requests.ApiError;
  
  import java.util.Objects;
  
  
  public class ResultOrError<T> {
      private final ApiError error;
      private final T result;
  
      public ResultOrError(Errors error, String message) {
          this(new ApiError(error, message));
      }
  
      public ResultOrError(ApiError error) {
          Objects.requireNonNull(error);
          this.error = error;
          this.result = null;
      }
  
      public ResultOrError(T result) {
          this.error = null;
          this.result = result;
      }
  
      public static <T> ResultOrError<T> of(T result) {
          return new ResultOrError<>(result);
      }
  
      public static <T> ResultOrError<T> of(ApiError error) {
          return new ResultOrError<>(error);
      }
  
      public boolean isError() {
          return error != null;
      }
  
      public boolean isResult() {
          return error == null;
      }
  
      public ApiError error() {
          return error;
      }
  
      public T result() {
          return result;
      }
  
      @Override
      public boolean equals(Object o) {
          if (o == null || (!o.getClass().equals(getClass()))) {
              return false;
          }
          ResultOrError<?> other = (ResultOrError<?>) o;
          return Objects.equals(error, other.error) &&
              Objects.equals(result, other.result);
      }
  
      @Override
      public int hashCode() {
          return Objects.hash(error, result);
      }
  
      @Override
      public String toString() {
          if (error == null) {
              return "ResultOrError(" + result + ")";
          } else {
              return "ResultOrError(" + error + ")";
          }
      }
  }
  