public static Object castAs()

in seatunnel-transforms-v2/src/main/java/org/apache/seatunnel/transform/sql/zeta/functions/SystemFunction.java [93:205]
113 lines of code
36 McCabe index (conditional complexity)

    public static Object castAs(List<Object> args) {
        Object v1 = args.get(0);
        String v2 = (String) args.get(1);
        if (v1 == null) {
            return null;
        }
        if (v1.equals(v2)) {
            return null;
        }
        switch (v2) {
            case "VARCHAR":
            case "STRING":
                return v1.toString();
            case "INT":
            case "INTEGER":
                return Integer.parseInt(v1.toString());
            case "BIGINT":
            case "LONG":
                return Long.parseLong(v1.toString());
            case "BYTE":
                return Byte.parseByte(v1.toString());
            case "BYTES":
            case "BINARY":
                return v1.toString().getBytes(StandardCharsets.UTF_8);
            case "DOUBLE":
                return Double.parseDouble(v1.toString());
            case "FLOAT":
                return Float.parseFloat(v1.toString());
            case "TIMESTAMP":
            case "DATETIME":
                if (v1 instanceof LocalDateTime) {
                    return v1;
                }
                if (v1 instanceof LocalDate) {
                    return LocalDateTime.of((LocalDate) v1, LocalTime.of(0, 0, 0));
                }
                if (v1 instanceof LocalTime) {
                    return LocalDateTime.of(LocalDate.now(), (LocalTime) v1);
                }
                if (v1 instanceof Long) {
                    Instant instant = Instant.ofEpochMilli(((Long) v1).longValue());
                    ZoneId zone = ZoneId.systemDefault();
                    return LocalDateTime.ofInstant(instant, zone);
                }
                throw new TransformException(
                        CommonErrorCodeDeprecated.UNSUPPORTED_OPERATION,
                        String.format("Unsupported CAST AS type: %s", v2));
            case "DATE":
                if (v1 instanceof LocalDateTime) {
                    return ((LocalDateTime) v1).toLocalDate();
                }
                if (v1 instanceof LocalDate) {
                    return v1;
                }
                if (v1 instanceof Integer) {
                    int dateValue = ((Integer) v1).intValue();
                    int year = dateValue / 10000;
                    int month = (dateValue / 100) % 100;
                    int day = dateValue % 100;
                    return LocalDate.of(year, month, day);
                }
                throw new TransformException(
                        CommonErrorCodeDeprecated.UNSUPPORTED_OPERATION,
                        String.format("Unsupported CAST AS type: %s", v2));
            case "TIME":
                if (v1 instanceof LocalDateTime) {
                    return ((LocalDateTime) v1).toLocalTime();
                }
                if (v1 instanceof LocalDate) {
                    return LocalTime.of(0, 0, 0);
                }
                if (v1 instanceof LocalTime) {
                    return v1;
                }
                if (v1 instanceof Integer) {
                    int intTime = ((Integer) v1).intValue();
                    int hour = intTime / 10000;
                    int minute = (intTime / 100) % 100;
                    int second = intTime % 100;
                    return LocalTime.of(hour, minute, second);
                }
                throw new TransformException(
                        CommonErrorCodeDeprecated.UNSUPPORTED_OPERATION,
                        String.format("Unsupported CAST AS type: %s", v2));
            case "DECIMAL":
                BigDecimal bigDecimal = new BigDecimal(v1.toString());
                Integer scale = (Integer) args.get(3);
                return bigDecimal.setScale(scale, RoundingMode.CEILING);
            case "BOOLEAN":
                if (v1 instanceof Number) {
                    if (Arrays.asList(1, 0).contains(((Number) v1).intValue())) {
                        return ((Number) v1).intValue() == 1;
                    } else {
                        throw new TransformException(
                                CommonErrorCodeDeprecated.UNSUPPORTED_OPERATION,
                                String.format("Unsupported CAST AS Boolean: %s", v1));
                    }
                } else if (v1 instanceof String) {
                    if (Arrays.asList("TRUE", "FALSE").contains(v1.toString().toUpperCase())) {
                        return Boolean.parseBoolean(v1.toString());
                    } else {
                        throw new TransformException(
                                CommonErrorCodeDeprecated.UNSUPPORTED_OPERATION,
                                String.format("Unsupported CAST AS Boolean: %s", v1));
                    }
                } else if (v1 instanceof Boolean) {
                    return v1;
                }
        }
        throw new TransformException(
                CommonErrorCodeDeprecated.UNSUPPORTED_OPERATION,
                String.format("Unsupported CAST AS type: %s", v2));
    }