cdrs 2.3.3

Cassandra DB driver written in Rust
Documentation 
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use crate::consistency::Consistency;
use crate::frame::AsByte;
use crate::frame::IntoBytes;
use crate::query::query_flags::QueryFlags;
use crate::query::query_values::QueryValues;
use crate::types::{to_bigint, to_int, to_short, CBytes};

/// Parameters of Query for query operation.
#[derive(Debug, Default)]
pub struct QueryParams {
    /// Cassandra consistency level.
    pub consistency: Consistency,
    /// Array of query flags.
    pub flags: Vec<QueryFlags>,
    /// Were values provided with names
    pub with_names: Option<bool>,
    /// Array of values.
    pub values: Option<QueryValues>,
    /// Page size.
    pub page_size: Option<i32>,
    /// Array of bytes which represents paging state.
    pub paging_state: Option<CBytes>,
    /// Serial `Consistency`.
    pub serial_consistency: Option<Consistency>,
    /// Timestamp.
    pub timestamp: Option<i64>,
}

impl QueryParams {
    /// Sets values of Query request params.
    pub fn set_values(&mut self, values: QueryValues) {
        self.flags.push(QueryFlags::Value);
        self.values = Some(values);
    }

    fn flags_as_byte(&self) -> u8 {
        self.flags.iter().fold(0, |acc, flag| acc | flag.as_byte())
    }

    #[allow(dead_code)]
    fn parse_query_flags(byte: u8) -> Vec<QueryFlags> {
        let mut flags: Vec<QueryFlags> = vec![];

        if QueryFlags::has_value(byte) {
            flags.push(QueryFlags::Value);
        }
        if QueryFlags::has_skip_metadata(byte) {
            flags.push(QueryFlags::SkipMetadata);
        }
        if QueryFlags::has_page_size(byte) {
            flags.push(QueryFlags::PageSize);
        }
        if QueryFlags::has_with_paging_state(byte) {
            flags.push(QueryFlags::WithPagingState);
        }
        if QueryFlags::has_with_serial_consistency(byte) {
            flags.push(QueryFlags::WithSerialConsistency);
        }
        if QueryFlags::has_with_default_timestamp(byte) {
            flags.push(QueryFlags::WithDefaultTimestamp);
        }
        if QueryFlags::has_with_names_for_values(byte) {
            flags.push(QueryFlags::WithNamesForValues);
        }

        flags
    }
}

impl IntoBytes for QueryParams {
    fn into_cbytes(&self) -> Vec<u8> {
        let mut v: Vec<u8> = vec![];

        v.extend_from_slice(self.consistency.into_cbytes().as_slice());
        v.push(self.flags_as_byte());
        if QueryFlags::has_value(self.flags_as_byte()) {
            if let Some(ref values) = self.values {
                v.extend_from_slice(to_short(values.len() as i16).as_slice());
                v.extend_from_slice(values.into_cbytes().as_slice());
            }
        }
        if QueryFlags::has_page_size(self.flags_as_byte()) && self.page_size.is_some() {
            // XXX clone
            v.extend_from_slice(
                to_int(
                    self.page_size
                        .clone()
                        // unwrap is safe as we've checked that
                        // self.page_size.is_some()
                        .unwrap(),
                )
                .as_slice(),
            );
        }
        if QueryFlags::has_with_paging_state(self.flags_as_byte()) && self.paging_state.is_some() {
            // XXX clone
            v.extend_from_slice(
                self.paging_state
                    .clone()
                    // unwrap is safe as we've checked that
                    // self.paging_state.is_some()
                    .unwrap()
                    .into_cbytes()
                    .as_slice(),
            );
        }
        if QueryFlags::has_with_serial_consistency(self.flags_as_byte())
            && self.serial_consistency.is_some()
        {
            // XXX clone
            v.extend_from_slice(
                self.serial_consistency
                    .clone()
                    // unwrap is safe as we've checked that
                    // self.serial_consistency.is_some()
                    .unwrap()
                    .into_cbytes()
                    .as_slice(),
            );
        }
        if QueryFlags::has_with_default_timestamp(self.flags_as_byte()) && self.timestamp.is_some()
        {
            // unwrap is safe as we've checked that self.timestamp.is_some()
            v.extend_from_slice(to_bigint(self.timestamp.unwrap()).as_slice());
        }

        v
    }
}