Proc to reward points

RewardPoints.java

    /**
     * If applicable, deducts the rewards amount from the current price, 
     * rewards points on the booking and returns the charge amount for the user's card.
     */
    public CCAmt doRewards(String pos, CCAmt currentCCAmt,
                                           rewardsInfo rewardsInfo,
                                           String PNR,
                                           XFactor xFactor,
                                           boolean isSpecialInventory,
                                           Money sellRateForSpecialInventory
                           ) {

        Money redeemableRewardsPointsInPurCurrency = rewardsInfo.getRewardsAmount();
        boolean hasrewardsPointsToRedeem = redeemableRewardsPointsInPurCurrency != null;

        if (log.isDebugEnabled()) {
            log.debug("rewardsPointsRedeemable :" + redeemableRewardsPointsInPurCurrency);
        }

        //use rewards points only if xFactor is a particular enum value
        boolean useRewardsPoints = XFactor.FA == xFactor;

        if (hasrewardsPointsToRedeem) {
            // We may need to create the CCAmt object again since its children are not updated with the Credit Card CCAmt.
            if (!useRewardsPoints) {
                // In previous stage, currentCCAmt.getPurchaseCCAmt()
                // returns the Total current price and not (Total current price minus Redeemed points).
                Money purCCAmt = currentCCAmt.getPurchaseCCAmt().
                        minus(redeemableRewardsPointsInPurCurrency);
                if (isGreaterThanZero(purCCAmt)) {
                    CCAmt ccAmtWithrewards;
                    Money posCCAmt = cpx.changeCurrency(purCCAmt);
                    ccAmtWithrewards = new CCAmt(posCCAmt, purCCAmt, currentCCAmt.getPNR(),
                            // other params here);
                    if (log.isDebugEnabled()) {
                        log.debug("purCCAmt :" + purCCAmt + " posCCAmt :" + posCCAmt);
                    }
                    currentCCAmt = ccAmtWithrewards;
                } else {
                    if (log.isDebugEnabled()) {
                        log.debug("Redeemed points and current price are equal. Setting CCAmt to null");
                    }
                    redeemableRewardsPointsInPurCurrency = currentCCAmt.getPurchaseCCAmt();
                    currentCCAmt = null;
                }
            }

            if (useRewardsPoints && hasrewardsPointsToRedeem) {
                if (log.isDebugEnabled()) {
                    log.debug("Using up rewards points");
                }
                debitRewardsPoints(...,redeemableRewardsPointsInPurCurrency.getCurrency()),..., PNR, ...);
            }
        }

        // Purchase CCAmt Amount will be 0 if Available points >= current price.
        // The CCAmt amount must be made null so that we don't make another debit call
        if (useRewardsPoints && hasrewardsPointsToRedeem && currentCCAmt != null &&
                isZero(currentCCAmt.getPurchaseCCAmt())) {
            currentCCAmt = null;
        }

        if (isSpecialInventory || useRewardsPoints && currentCCAmt != null &&
                currentCCAmt.getPurchaseCCAmt() != null) {
            Money ccAmountWithRewards;
            if (isSpecialInventory && isGreaterThanZero(sellRateForSpecialInventory)) {
                ccAmountWithRewards = redeemableRewardsPointsInPurCurrency != null ?
                        sellRateForSpecialInventory.minus(redeemableRewardsPointsInPurCurrency.getCurrency()) : sellRateForSpecialInventory;
            } else {
                ccAmountWithRewards = currentCCAmt.getPurchaseCCAmt();
            }
            if (log.isDebugEnabled()) {
                log.debug("Rewarding points for this sale");
            }

            if (isGreaterThanZero(ccAmountWithRewards)) {
                rewardPoints(..., ccAmountWithRewards,.., PNR, ...);
            }
        }
        return currentCCAmt;
    }