public BsonValue visit()

in flink-connector-mongodb/src/main/java/org/apache/flink/connector/mongodb/table/MongoFilterPushDownVisitor.java [183:228]
45 lines of code
10 McCabe index (conditional complexity)

    public BsonValue visit(ValueLiteralExpression litExp) {
        LogicalType type = litExp.getOutputDataType().getLogicalType();
        Optional<BsonValue> value;
        switch (type.getTypeRoot()) {
            case CHAR:
            case VARCHAR:
                value = litExp.getValueAs(String.class).map(BsonString::new);
                break;
            case BOOLEAN:
                value = litExp.getValueAs(Boolean.class).map(BsonBoolean::new);
                break;
            case DECIMAL:
                value =
                        litExp.getValueAs(BigDecimal.class)
                                .map(Decimal128::new)
                                .map(BsonDecimal128::new);
                break;
            case INTEGER:
                value = litExp.getValueAs(Integer.class).map(BsonInt32::new);
                break;
            case BIGINT:
                value = litExp.getValueAs(Long.class).map(BsonInt64::new);
                break;
            case DOUBLE:
                value = litExp.getValueAs(Double.class).map(BsonDouble::new);
                break;
            case TIMESTAMP_WITHOUT_TIME_ZONE:
                value =
                        litExp.getValueAs(LocalDateTime.class)
                                .map(Timestamp::valueOf)
                                .map(Timestamp::getTime)
                                .map(BsonDateTime::new);
                break;
            case TIMESTAMP_WITH_LOCAL_TIME_ZONE:
                value =
                        litExp.getValueAs(Instant.class)
                                .map(Instant::toEpochMilli)
                                .map(BsonDateTime::new);
                break;
            default:
                // Use BsonUndefined to represent unsupported values.
                value = Optional.of(new BsonUndefined());
                break;
        }
        return value.orElse(BsonNull.VALUE);
    }