public static HL7Message makeACK(HL7Segment msh, String ackCode, String text) { int size = msh.size(); HL7Segment ackmsh = HL7Segment.makeMSH(size, msh.getFieldSeparator(), msh.getEncodingCharacters()); ackmsh.setField(2, msh.getField(4, null)); ackmsh.setField(3, msh.getField(5, null)); ackmsh.setField(4, msh.getField(2, null)); ackmsh.setField(5, msh.getField(3, null)); ackmsh.setField(8, "ACK^" + msh.getMessageType().substring(4,7) + "^ACK"); for (int i = 10; i < size; i++) ackmsh.setField(i, msh.getField(i, null)); HL7Segment msa = new HL7Segment(4, msh.getFieldSeparator(), msh.getEncodingCharacters()); msa.setField(0, "MSA"); msa.setField(1, ackCode); msa.setField(2, msh.getMessageControlID()); msa.setField(3, text != null && text.length() > 80 ? text.substring(0, 80) : text); HL7Message ack = new HL7Message(2); ack.add(ackmsh); ack.add(msa); return ack; }