question: public String objectToString ( final long shopId , final String skuCode , final BigDecimal quantity ) { StringBuilder stringBuilder = new StringBuilder ( ) ; stringBuilder . append ( idBridge . objectToString ( new BigDecimal ( shopId ) ) ) ; stringBuilder . append ( '_' ) ; stringBuilder . append ( skuCode ) ; stringBuilder . append ( '_' ) ; stringBuilder . append ( qtyBridge . objectToString ( quantity ) ) ; return stringBuilder . toString ( ) ; }
target:  Create index value for given shop currency and price.