Creates an output stream filter built on top of the specified
underlying output stream.
@param outputStream the underlying output stream to be assigned to
the field {@code this.outputStream} for later use, or
<code>null</code> if this instance is to be
created without an underlying stream.
Creates an output stream filter built on top of the specified underlying output stream.
@param outputStream the underlying output stream to be assigned to the field {@code this.outputStream} for later use, or <code>null</code> if this instance is to be created without an underlying stream.