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1   /*
2    * Copyright 2014 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    *   https://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  package io.netty.handler.codec.spdy;
17  
18  import io.netty.util.internal.PlatformDependent;
19  import io.netty.util.internal.SuppressJava6Requirement;
20  import io.netty.util.internal.ThrowableUtil;
21  
22  public class SpdyProtocolException extends Exception {
23  
24      private static final long serialVersionUID = 7870000537743847264L;
25  
26      /**
27       * Creates a new instance.
28       */
29      public SpdyProtocolException() { }
30  
31      /**
32       * Creates a new instance.
33       */
34      public SpdyProtocolException(String message, Throwable cause) {
35          super(message, cause);
36      }
37  
38      /**
39       * Creates a new instance.
40       */
41      public SpdyProtocolException(String message) {
42          super(message);
43      }
44  
45      /**
46       * Creates a new instance.
47       */
48      public SpdyProtocolException(Throwable cause) {
49          super(cause);
50      }
51  
52      static SpdyProtocolException newStatic(String message, Class<?> clazz, String method) {
53          final SpdyProtocolException exception;
54          if (PlatformDependent.javaVersion() >= 7) {
55              exception = new StacklessSpdyProtocolException(message, true);
56          } else {
57              exception = new StacklessSpdyProtocolException(message);
58          }
59          return ThrowableUtil.unknownStackTrace(exception, clazz, method);
60      }
61  
62      @SuppressJava6Requirement(reason = "uses Java 7+ Exception.<init>(String, Throwable, boolean, boolean)" +
63              " but is guarded by version checks")
64      private SpdyProtocolException(String message, boolean shared) {
65          super(message, null, false, true);
66          assert shared;
67      }
68  
69      private static final class StacklessSpdyProtocolException extends SpdyProtocolException {
70          private static final long serialVersionUID = -6302754207557485099L;
71  
72          StacklessSpdyProtocolException(String message) {
73              super(message);
74          }
75  
76          StacklessSpdyProtocolException(String message, boolean shared) {
77              super(message, shared);
78          }
79  
80          // Override fillInStackTrace() so we not populate the backtrace via a native call and so leak the
81          // Classloader.
82          @Override
83          public Throwable fillInStackTrace() {
84              return this;
85          }
86      }
87  }