public synchronized void addToBook(Quote q) throws Exception {
Price sellQuote = q.getQuoteSide("SELL").getPrice();
Price buyQuote = q.getQuoteSide("BUY").getPrice();
if (sellQuote.lessOrEqual(buyQuote))
throw new DataValidationException("SELL Price is less than or Equal to BUY Price");
if (q.getQuoteSide("SELL").getOriginalVolume() <= 0
|| q.getQuoteSide("BUY").getOriginalVolume() <= 0)
throw new DataValidationException("BUY or SELL side is less than or equal to zero");
if (this.userQuotes.contains(q.getUserName())) {
buySide.removeQuote(q.getUserName());
sellSide.removeQuote(q.getUserName());
this.updateCurrentMarket();
}
this.addToBook(BookSide.BUY, q.getQuoteSide("BUY"));
this.addToBook(BookSide.SELL, q.getQuoteSide("SELL"));
userQuotes.add(q.getUserName());
this.updateCurrentMarket();
}