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use crate::protocol::parts::type_id::TypeId;
use crate::protocol::util;
use crate::{HdbError, HdbResult};
use byteorder::{LittleEndian, ReadBytesExt};
use std::u32;
#[derive(Debug)]
pub(crate) struct ParameterDescriptors(Vec<ParameterDescriptor>);
impl ParameterDescriptors {
pub fn iter_in(&self) -> impl std::iter::Iterator<Item = &ParameterDescriptor> {
self.0.iter().filter(|ms| {
(ms.direction == ParameterDirection::IN) | (ms.direction == ParameterDirection::INOUT)
})
}
pub fn iter_out(&self) -> impl std::iter::Iterator<Item = &ParameterDescriptor> {
self.0.iter().filter(|ms| {
(ms.direction == ParameterDirection::OUT) | (ms.direction == ParameterDirection::INOUT)
})
}
pub fn has_in(&self) -> bool {
self.iter_in().next().is_some()
}
pub fn parse<T: std::io::BufRead>(
count: usize,
rdr: &mut T,
) -> HdbResult<ParameterDescriptors> {
let mut vec_pd = Vec::<ParameterDescriptor>::new();
let mut name_offsets = Vec::<u32>::new();
for _ in 0..count {
let option = rdr.read_u8()?;
let value_type = rdr.read_u8()?;
let mode = ParameterDescriptor::direction_from_u8(rdr.read_u8()?)?;
rdr.read_u8()?;
name_offsets.push(rdr.read_u32::<LittleEndian>()?);
let length = rdr.read_i16::<LittleEndian>()?;
let fraction = rdr.read_i16::<LittleEndian>()?;
rdr.read_u32::<LittleEndian>()?;
vec_pd.push(ParameterDescriptor::try_new(
option, value_type, mode, length, fraction,
)?);
}
for (descriptor, name_offset) in vec_pd.iter_mut().zip(name_offsets.iter()) {
if name_offset != &u32::MAX {
let length = rdr.read_u8()?;
let name = util::string_from_cesu8(util::parse_bytes(length as usize, rdr)?)?;
descriptor.set_name(name);
}
}
Ok(ParameterDescriptors(vec_pd))
}
pub fn into_inner(self) -> Vec<ParameterDescriptor> {
self.0
}
pub fn ref_inner(&self) -> &Vec<ParameterDescriptor> {
&self.0
}
}
#[derive(Clone, Debug)]
pub struct ParameterDescriptor {
parameter_option: u8,
type_id: TypeId,
nullable: bool,
scale: i16,
precision: i16,
direction: ParameterDirection,
name: Option<String>,
}
impl ParameterDescriptor {
pub fn binding(&self) -> ParameterBinding {
if self.parameter_option & 0b_0000_0001_u8 != 0 {
ParameterBinding::Mandatory
} else if self.parameter_option & 0b_0000_0010_u8 != 0 {
ParameterBinding::Optional
} else {
ParameterBinding::HasDefault
}
}
pub fn is_nullable(&self) -> bool {
(self.parameter_option & 0b_0000_0010_u8) != 0
}
pub fn has_default(&self) -> bool {
(self.parameter_option & 0b_0000_0100_u8) != 0
}
pub fn is_auto_incremented(&self) -> bool {
(self.parameter_option & 0b_0010_0000_u8) != 0
}
pub fn is_array_type(&self) -> bool {
(self.parameter_option & 0b_0100_0000_u8) != 0
}
pub fn type_id(&self) -> TypeId {
self.type_id
}
pub fn nullable(&self) -> bool {
self.nullable
}
pub fn scale(&self) -> i16 {
self.scale
}
pub fn precision(&self) -> i16 {
self.precision
}
pub fn direction(&self) -> ParameterDirection {
self.direction.clone()
}
pub fn name(&self) -> Option<&String> {
self.name.as_ref()
}
fn try_new(
parameter_option: u8,
type_code: u8,
direction: ParameterDirection,
precision: i16,
scale: i16,
) -> HdbResult<ParameterDescriptor> {
let nullable = (parameter_option & 0b_0000_0010_u8) != 0;
let type_id = TypeId::try_new(type_code)?;
Ok(ParameterDescriptor {
parameter_option,
type_id,
nullable,
direction,
precision,
scale,
name: None,
})
}
fn set_name(&mut self, name: String) {
self.name = Some(name);
}
fn direction_from_u8(v: u8) -> HdbResult<ParameterDirection> {
match v {
1 => Ok(ParameterDirection::IN),
2 => Ok(ParameterDirection::INOUT),
4 => Ok(ParameterDirection::OUT),
_ => Err(HdbError::impl_(&format!(
"invalid value for ParameterDirection: {}",
v
))),
}
}
}
impl std::fmt::Display for ParameterDescriptor {
fn fmt(&self, fmt: &mut std::fmt::Formatter) -> std::fmt::Result {
if let Some(ref s) = self.name {
write!(fmt, "{} ", s,)?;
}
write!(
fmt,
"{:?}{:?} {:?} {:?}, Scale({}), Precision({})",
if self.nullable { "Nullable " } else { "" },
self.type_id,
self.binding(),
self.direction(),
self.precision(),
self.scale()
)?;
Ok(())
}
}
#[derive(Clone, Debug, PartialEq)]
pub enum ParameterBinding {
Optional,
Mandatory,
HasDefault,
}
#[derive(Clone, Debug, PartialEq)]
pub enum ParameterDirection {
IN,
INOUT,
OUT,
}