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quantityMatches = true; break; case EMPTY: if (filterFluid != null && tank.isTankEmpty(filterFluid)) quantityMatches = true; else if (filterFluid == null && tank.areTanksEmpty()) quantityMatches = true; break; case NOT_EMPTY: if (filterFluid != null && tank.getFluidQty(filterFluid) > 0) quantityMatches = true;