Examples with SqlNullable com.facebook.presto.spi.function.SqlNullable used on opensource projects

Example 11 with SqlNullable

use of com.facebook.presto.spi.function.SqlNullable in project presto by prestodb.

the class JsonOperators method castToBigint.

@ScalarOperator(CAST)
@SqlNullable
@SqlType(BIGINT)
public static Long castToBigint(@SqlType(JSON) Slice json) {
    try (JsonParser parser = createJsonParser(JSON_FACTORY, json)) {
        parser.nextToken();
        Long result;
        switch(parser.getCurrentToken()) {
            case VALUE_NULL:
                result = null;
                break;
            case VALUE_STRING:
                result = VarcharOperators.castToBigint(Slices.utf8Slice(parser.getText()));
                break;
            case VALUE_NUMBER_FLOAT:
                result = DoubleOperators.castToLong(parser.getDoubleValue());
                break;
            case VALUE_NUMBER_INT:
                result = parser.getLongValue();
                break;
            case VALUE_TRUE:
                result = BooleanOperators.castToBigint(true);
                break;
            case VALUE_FALSE:
                result = BooleanOperators.castToBigint(false);
                break;
            default:
                throw new PrestoException(INVALID_CAST_ARGUMENT, format("Cannot cast '%s' to %s", json.toStringUtf8(), BIGINT));
        }
        // check no trailing token
        checkCondition(parser.nextToken() == null, INVALID_CAST_ARGUMENT, "Cannot cast input json to BIGINT");
        return result;
    } catch (IOException e) {
        throw new PrestoException(INVALID_CAST_ARGUMENT, format("Cannot cast '%s' to %s", json.toStringUtf8(), BIGINT));
    }
}

Example 12 with SqlNullable

use of com.facebook.presto.spi.function.SqlNullable in project presto by prestodb.

the class JsonOperators method castToVarchar.

@ScalarOperator(CAST)
@SqlNullable
@LiteralParameters("x")
@SqlType("varchar(x)")
public static Slice castToVarchar(@SqlType(JSON) Slice json) {
    try (JsonParser parser = createJsonParser(JSON_FACTORY, json)) {
        JsonToken nextToken = parser.nextToken();
        Slice result;
        switch(nextToken) {
            case VALUE_NULL:
                result = null;
                break;
            case VALUE_STRING:
                result = Slices.utf8Slice(parser.getText());
                break;
            case VALUE_NUMBER_FLOAT:
                // Avoidance of loss of precision does not seem to be possible here because of Jackson implementation.
                result = DoubleOperators.castToVarchar(parser.getDoubleValue());
                break;
            case VALUE_NUMBER_INT:
                // An alternative is calling getLongValue and then BigintOperators.castToVarchar.
                // It doesn't work as well because it can result in overflow and underflow exceptions for large integral numbers.
                result = Slices.utf8Slice(parser.getText());
                break;
            case VALUE_TRUE:
                result = BooleanOperators.castToVarchar(true);
                break;
            case VALUE_FALSE:
                result = BooleanOperators.castToVarchar(false);
                break;
            default:
                throw new PrestoException(INVALID_CAST_ARGUMENT, format("Cannot cast '%s' to %s", json.toStringUtf8(), VARCHAR));
        }
        // check no trailing token
        checkCondition(parser.nextToken() == null, INVALID_CAST_ARGUMENT, "Cannot cast input json to VARCHAR");
        return result;
    } catch (IOException e) {
        throw new PrestoException(INVALID_CAST_ARGUMENT, format("Cannot cast '%s' to %s", json.toStringUtf8(), VARCHAR));
    }
}

Example 13 with SqlNullable

use of com.facebook.presto.spi.function.SqlNullable in project presto by prestodb.

the class JsonOperators method castToDouble.

@ScalarOperator(CAST)
@SqlNullable
@SqlType(DOUBLE)
public static Double castToDouble(@SqlType(JSON) Slice json) {
    try (JsonParser parser = createJsonParser(JSON_FACTORY, json)) {
        parser.nextToken();
        Double result;
        switch(parser.getCurrentToken()) {
            case VALUE_NULL:
                result = null;
                break;
            case VALUE_STRING:
                result = VarcharOperators.castToDouble(Slices.utf8Slice(parser.getText()));
                break;
            case VALUE_NUMBER_FLOAT:
                result = parser.getDoubleValue();
                break;
            case VALUE_NUMBER_INT:
                // An alternative is calling getLongValue and then BigintOperators.castToDouble.
                // It doesn't work as well because it can result in overflow and underflow exceptions for large integral numbers.
                result = parser.getDoubleValue();
                break;
            case VALUE_TRUE:
                result = BooleanOperators.castToDouble(true);
                break;
            case VALUE_FALSE:
                result = BooleanOperators.castToDouble(false);
                break;
            default:
                throw new PrestoException(INVALID_CAST_ARGUMENT, format("Cannot cast '%s' to %s", json.toStringUtf8(), DOUBLE));
        }
        // check no trailing token
        checkCondition(parser.nextToken() == null, INVALID_CAST_ARGUMENT, "Cannot cast input json to DOUBLE");
        return result;
    } catch (IOException e) {
        throw new PrestoException(INVALID_CAST_ARGUMENT, format("Cannot cast '%s' to %s", json.toStringUtf8(), DOUBLE));
    }
}

Example 14 with SqlNullable

use of com.facebook.presto.spi.function.SqlNullable in project presto by prestodb.

the class UrlFunctions method urlExtractParameter.

@SqlNullable
@Description("extract query parameter from url")
@ScalarFunction
@LiteralParameters({ "x", "y" })
@SqlType("varchar(x)")
public static Slice urlExtractParameter(@SqlType("varchar(x)") Slice url, @SqlType("varchar(y)") Slice parameterName) {
    URI uri = parseUrl(url);
    if ((uri == null) || (uri.getQuery() == null)) {
        return null;
    }
    Slice query = slice(uri.getQuery());
    String parameter = parameterName.toStringUtf8();
    Iterable<String> queryArgs = QUERY_SPLITTER.split(query.toStringUtf8());
    for (String queryArg : queryArgs) {
        Iterator<String> arg = ARG_SPLITTER.split(queryArg).iterator();
        if (arg.next().equals(parameter)) {
            if (arg.hasNext()) {
                return utf8Slice(arg.next());
            }
            // first matched key is empty
            return Slices.EMPTY_SLICE;
        }
    }
    // no key matched
    return null;
}