@Override public Mask transferMask(Mask mask, Product product) { if (canTransferMask(mask, product)) { String expression = getExpression(mask); final Map<Mask, Mask> translationMap = transferReferredMasks(expression, mask.getProduct(), product); expression = translateExpression(translationMap, expression); final String originalMaskName = mask.getName(); final String maskName = getAvailableMaskName(originalMaskName, product.getMaskGroup()); return product.addMask(maskName, expression, mask.getDescription(), mask.getImageColor(), mask.getImageTransparency()); } return null; }