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.beam.sdk.util;
  
  /** Thrown when a value appears to have been mutated, but that mutation is forbidden. */
  public class IllegalMutationException extends RuntimeException {
    private Object savedValue;
    private Object newValue;
  
    public IllegalMutationException(String message, Object savedValue, Object newValue) {
      super(message);
      this.savedValue = savedValue;
      this.newValue = newValue;
    }
  
    public IllegalMutationException(
        String message, Object savedValue, Object newValue, Throwable cause) {
      super(message, cause);
      this.savedValue = savedValue;
      this.newValue = newValue;
    }
  
    /** The original value, before the illegal mutation. */
    public Object getSavedValue() {
      return savedValue;
    }
  
    /** The value after the illegal mutation. */
    public Object getNewValue() {
      return newValue;
    }
  }
  