public WebSocketMessage<?> encode(
Message<byte[]> message, Class<? extends WebSocketSession> sessionType) {
StompHeaderAccessor accessor =
MessageHeaderAccessor.getAccessor(message, StompHeaderAccessor.class);
Assert.notNull(accessor, "No StompHeaderAccessor available");
byte[] payload = message.getPayload();
byte[] bytes = ENCODER.encode(accessor.getMessageHeaders(), payload);
boolean useBinary =
(payload.length > 0
&& !(SockJsSession.class.isAssignableFrom(sessionType))
&& MimeTypeUtils.APPLICATION_OCTET_STREAM.isCompatibleWith(
accessor.getContentType()));
return (useBinary ? new BinaryMessage(bytes) : new TextMessage(bytes));
}