code: /*
   * 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.skywalking.oap.meter.analyzer.dsl;
  
  import lombok.AccessLevel;
  import lombok.EqualsAndHashCode;
  import lombok.Getter;
  import lombok.RequiredArgsConstructor;
  import lombok.ToString;
  
  /**
   * Result indicates the parsing result of expression.
   */
  @RequiredArgsConstructor(access = AccessLevel.PRIVATE)
  @EqualsAndHashCode
  @ToString
  @Getter
  public class Result {
  
      /**
       * fail is a static factory method builds failed result based on {@link Throwable}.
       *
       * @param throwable to build failed result.
       * @return failed result.
       */
      public static Result fail(final Throwable throwable) {
          return new Result(false, true, throwable.getMessage(), SampleFamily.EMPTY);
      }
  
      /**
       * fail is a static factory method builds failed result based on error message.
       *
       * @param message is the error details why the result is failed.
       * @return failed result.
       */
      public static Result fail(String message) {
          return new Result(false, false, message, SampleFamily.EMPTY);
      }
  
      /**
       * fail is a static factory method builds failed result.
       *
       * @return failed result.
       */
      public static Result fail() {
          return new Result(false, false, null, SampleFamily.EMPTY);
      }
  
      /**
       * success is a static factory method builds successful result.
       *
       * @param sf is the parsed result.
       * @return successful result.
       */
      public static Result success(SampleFamily sf) {
          return new Result(true, false, null, sf);
      }
  
      private final boolean success;
  
      private final boolean isThrowable;
  
      private final String error;
  
      private final SampleFamily data;
  }
  