can_poll

Checks if this is actually pollable.

Some classes may implement PollableOutputStream but have only certain instances of that class be pollable. If this method returns false, then the behavior of other PollableOutputStream methods is undefined.

For any given stream, the value returned by this method is constant; a stream cannot switch from pollable to non-pollable or vice versa.

Parameters:

this	a PollableOutputStream.

Returns:

true if this is pollable, false if not.