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   /*
    * Copyright 2014 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.handler.codec.spdy;
  
  import io.netty.util.internal.PlatformDependent;
  import io.netty.util.internal.SuppressJava6Requirement;
  import io.netty.util.internal.ThrowableUtil;
  
  public class SpdyProtocolException extends Exception {
  
      private static final long serialVersionUID = 7870000537743847264L;
  
      /**
       * Creates a new instance.
       */
      public SpdyProtocolException() { }
  
      /**
       * Creates a new instance.
       */
      public SpdyProtocolException(String message, Throwable cause) {
          super(message, cause);
      }
  
      /**
       * Creates a new instance.
       */
      public SpdyProtocolException(String message) {
          super(message);
      }
  
      /**
       * Creates a new instance.
       */
      public SpdyProtocolException(Throwable cause) {
          super(cause);
      }
  
      static SpdyProtocolException newStatic(String message, Class<?> clazz, String method) {
          final SpdyProtocolException exception;
          if (PlatformDependent.javaVersion() >= 7) {
              exception = new StacklessSpdyProtocolException(message, true);
          } else {
              exception = new StacklessSpdyProtocolException(message);
          }
          return ThrowableUtil.unknownStackTrace(exception, clazz, method);
      }
  
      @SuppressJava6Requirement(reason = "uses Java 7+ Exception.<init>(String, Throwable, boolean, boolean)" +
              " but is guarded by version checks")
      private SpdyProtocolException(String message, boolean shared) {
          super(message, null, false, true);
          assert shared;
      }
  
      private static final class StacklessSpdyProtocolException extends SpdyProtocolException {
          private static final long serialVersionUID = -6302754207557485099L;
  
          StacklessSpdyProtocolException(String message) {
              super(message);
          }
  
          StacklessSpdyProtocolException(String message, boolean shared) {
              super(message, shared);
          }
  
          // Override fillInStackTrace() so we not populate the backtrace via a native call and so leak the
          // Classloader.
          @Override
          public Throwable fillInStackTrace() {
              return this;
          }
      }
  }