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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  
17  package io.netty.util;
18  
19  /**
20   * An {@link IllegalStateException} which is raised when a user attempts to access a {@link ReferenceCounted} whose
21   * reference count has been decreased to 0 (and consequently freed).
22   */
23  public class IllegalReferenceCountException extends IllegalStateException {
24  
25      private static final long serialVersionUID = -2507492394288153468L;
26  
27      public IllegalReferenceCountException() { }
28  
29      public IllegalReferenceCountException(int refCnt) {
30          this("refCnt: " + refCnt);
31      }
32  
33      public IllegalReferenceCountException(int refCnt, int increment) {
34          this("refCnt: " + refCnt + ", " + (increment > 0? "increment: " + increment : "decrement: " + -increment));
35      }
36  
37      public IllegalReferenceCountException(String message) {
38          super(message);
39      }
40  
41      public IllegalReferenceCountException(String message, Throwable cause) {
42          super(message, cause);
43      }
44  
45      public IllegalReferenceCountException(Throwable cause) {
46          super(cause);
47      }
48  }