DBObject objNew = saveObj.get(1);
Boolean multi = exchange.getIn().getHeader(MongoDbConstants.MULTIUPDATE, Boolean.class);
Boolean upsert = exchange.getIn().getHeader(MongoDbConstants.UPSERT, Boolean.class);
WriteResult result;
WriteConcern wc = extractWriteConcern(exchange);
// In API 2.7, the default upsert and multi values of update(DBObject, DBObject) are false, false, so we unconditionally invoke the
// full-signature method update(DBObject, DBObject, boolean, boolean). However, the default behaviour may change in the future,
// so it's safer to be explicit at this level for full determinism
if (multi == null && upsert == null) {
// for update with no multi nor upsert but with specific WriteConcern there is no update signature without multi and upsert args,
// so assume defaults
result = wc == null ? dbCol.update(updateCriteria, objNew) : dbCol.update(updateCriteria, objNew, false, false, wc);
} else {
// we calculate the final boolean values so that if any of these parameters is null, it is resolved to false
result = wc == null ? dbCol.update(updateCriteria, objNew, calculateBooleanValue(upsert), calculateBooleanValue(multi))
: dbCol.update(updateCriteria, objNew, calculateBooleanValue(upsert), calculateBooleanValue(multi), wc);
}
Message resultMessage = prepareResponseMessage(exchange, MongoDbOperation.update);
// we always return the WriteResult, because whether the getLastError was called or not, the user will have the means to call it or
// obtain the cached CommandResult
processAndTransferWriteResult(result, exchange);
resultMessage.setHeader(MongoDbConstants.RECORDS_AFFECTED, result.getN());
}