public static IOException unwrapInnerException()

in hadoop-api-shim/src/main/java/org/apache/hadoop/fs/shim/functional/FutureIO.java [166:190]

• 22 lines of code
• 9 McCabe index (conditional complexity)

  public static IOException unwrapInnerException(final Throwable e) {
    Throwable cause = e.getCause();
    if (cause instanceof IOException) {
      return (IOException) cause;
    } else if (cause instanceof UncheckedIOException) {
      // this is always an IOException
      return ((UncheckedIOException) cause).getCause();
    } else if (cause instanceof CompletionException) {
      return unwrapInnerException(cause);
    } else if (cause instanceof ExecutionException) {
      return unwrapInnerException(cause);
    } else if (cause instanceof InvocationTargetException) {
      return unwrapInnerException(cause);
    } else if (cause instanceof RuntimeException) {
      throw (RuntimeException) cause;
    } else if (cause instanceof Error) {
      throw (Error) cause;
    } else if (cause != null) {
      // other type: wrap with a new IOE
      return new IOException(cause);
    } else {
      // this only happens if there was no cause.
      return new IOException(e);
    }
  }