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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.util;
  
  /**
   * An {@link IllegalStateException} which is raised when a user attempts to access a {@link ReferenceCounted} whose
   * reference count has been decreased to 0 (and consequently freed).
   */
  public class IllegalReferenceCountException extends IllegalStateException {
  
      private static final long serialVersionUID = -2507492394288153468L;
  
      public IllegalReferenceCountException() { }
  
      public IllegalReferenceCountException(int refCnt) {
          this("refCnt: " + refCnt);
      }
  
      public IllegalReferenceCountException(int refCnt, int increment) {
          this("refCnt: " + refCnt + ", " + (increment > 0? "increment: " + increment : "decrement: " + -increment));
      }
  
      public IllegalReferenceCountException(String message) {
          super(message);
      }
  
      public IllegalReferenceCountException(String message, Throwable cause) {
          super(message, cause);
      }
  
      public IllegalReferenceCountException(Throwable cause) {
          super(cause);
      }
  }