*
     * @see jcifs.SmbSession#unwrap(java.lang.Class)
     */
    @SuppressWarnings ( "unchecked" )
    @Override
    public <T extends SmbSession> T unwrap ( Class<T> type ) {
        if ( type.isAssignableFrom(this.getClass()) ) {
            return (T) this;
        }
        throw new ClassCastException();
    }


    /**
     * @return session increased usage count
     */

     *
     * @see jcifs.SmbTransport#unwrap(java.lang.Class)
     */
    @SuppressWarnings ( "unchecked" )
    @Override
    public <T extends SmbTransport> T unwrap ( Class<T> type ) {
        if ( type.isAssignableFrom(this.getClass()) ) {
            return (T) this;
        }
        throw new ClassCastException();
    }


    /**
     *
     * @param tf
     * @return a session for the context

  private static void assertSubtypeBeforeSupertype(Iterable<? extends Class<?>> types) {
    int i = 0;
    for (Class<?> left : types) {
      int j = 0;
      for (Class<?> right : types) {
        if (left.isAssignableFrom(right)) {
          assertTrue(left + " should be after " + right, i >= j);
        }
        j++;
      }
      i++;
    }
  }

  // Tests to make sure assertSubtypeBeforeSupertype() works.

  private static void assertSubtypeBeforeSupertype(Iterable<? extends Class<?>> types) {
    int i = 0;
    for (Class<?> left : types) {
      int j = 0;
      for (Class<?> right : types) {
        if (left.isAssignableFrom(right)) {
          assertTrue(left + " should be after " + right, i >= j);
        }
        j++;
      }
      i++;
    }
  }

  // Tests to make sure assertSubtypeBeforeSupertype() works.