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use std::convert::TryInto;
use static_assertions::assert_impl_all;
use crate::{
names::{BusName, InterfaceName, MemberName, UniqueName},
zvariant::{ObjectPath, Str},
Error, MatchRule, MatchRulePathSpec, MessageType, Result,
};
const MAX_ARGS: u8 = 64;
/// Builder for [`MatchRule`].
///
/// This is created by [`MatchRule::builder`].
pub struct MatchRuleBuilder<'m>(MatchRule<'m>);
assert_impl_all!(MatchRuleBuilder<'_>: Send, Sync, Unpin);
impl<'m> MatchRuleBuilder<'m> {
/// Build the `MatchRule`.
pub fn build(self) -> MatchRule<'m> {
self.0
}
/// Set the sender.
pub fn sender<B>(mut self, sender: B) -> Result<Self>
where
B: TryInto<BusName<'m>>,
B::Error: Into<Error>,
{
self.0.sender = Some(sender.try_into().map_err(Into::into)?);
Ok(self)
}
/// Set the message type.
pub fn msg_type(mut self, msg_type: MessageType) -> Self {
self.0.msg_type = Some(msg_type);
self
}
/// Set the interface.
pub fn interface<I>(mut self, interface: I) -> Result<Self>
where
I: TryInto<InterfaceName<'m>>,
I::Error: Into<Error>,
{
self.0.interface = Some(interface.try_into().map_err(Into::into)?);
Ok(self)
}
/// Set the member.
pub fn member<M>(mut self, member: M) -> Result<Self>
where
M: TryInto<MemberName<'m>>,
M::Error: Into<Error>,
{
self.0.member = Some(member.try_into().map_err(Into::into)?);
Ok(self)
}
/// Set the path.
///
/// Note: Since both a path and a path namespace are not allowed to appear in a match rule at
/// the same time, this overrides any path namespace previously set.
pub fn path<P>(mut self, path: P) -> Result<Self>
where
P: TryInto<ObjectPath<'m>>,
P::Error: Into<Error>,
{
self.0.path_spec = path
.try_into()
.map(MatchRulePathSpec::Path)
.map(Some)
.map_err(Into::into)?;
Ok(self)
}
/// Set the path namespace.
///
/// Note: Since both a path and a path namespace are not allowed to appear in a match rule at
/// the same time, this overrides any path previously set.
pub fn path_namespace<P>(mut self, path_namespace: P) -> Result<Self>
where
P: TryInto<ObjectPath<'m>>,
P::Error: Into<Error>,
{
self.0.path_spec = path_namespace
.try_into()
.map(MatchRulePathSpec::PathNamespace)
.map(Some)
.map_err(Into::into)?;
Ok(self)
}
/// Set the destination.
pub fn destination<B>(mut self, destination: B) -> Result<Self>
where
B: TryInto<UniqueName<'m>>,
B::Error: Into<Error>,
{
self.0.destination = Some(destination.try_into().map_err(Into::into)?);
Ok(self)
}
/// Append an arguments.
///
/// Use this in instead of [`MatchRuleBuilder::arg`] if you want to sequentially add args.
///
/// # Errors
///
/// [`Error::InvalidMatchRule`] on attempt to add the 65th argument.
pub fn add_arg<S>(self, arg: S) -> Result<Self>
where
S: Into<Str<'m>>,
{
let idx = self.0.args.len() as u8;
self.arg(idx, arg)
}
/// Add an argument of a specified index.
///
/// # Errors
///
/// [`Error::InvalidMatchRule`] if `idx` is greater than 64.
pub fn arg<S>(mut self, idx: u8, arg: S) -> Result<Self>
where
S: Into<Str<'m>>,
{
if idx >= MAX_ARGS {
return Err(Error::InvalidMatchRule);
}
let value = (idx, arg.into());
let vec_idx = match self.0.args().binary_search_by(|(i, _)| i.cmp(&idx)) {
Ok(i) => {
// If the argument is already present, replace it.
self.0.args.remove(i);
i
}
Err(i) => i,
};
self.0.args.insert(vec_idx, value);
Ok(self)
}
/// Append a path argument.
///
/// Use this in instead of [`MatchRuleBuilder::arg_path`] if you want to sequentially add args.
///
/// # Errors
///
/// [`Error::InvalidMatchRule`] on attempt to add the 65th path argument.
pub fn add_arg_path<P>(self, arg_path: P) -> Result<Self>
where
P: TryInto<ObjectPath<'m>>,
P::Error: Into<Error>,
{
let idx = self.0.arg_paths.len() as u8;
self.arg_path(idx, arg_path)
}
/// Add a path argument of a specified index.
///
/// # Errors
///
/// [`Error::InvalidMatchRule`] if `idx` is greater than 64.
pub fn arg_path<P>(mut self, idx: u8, arg_path: P) -> Result<Self>
where
P: TryInto<ObjectPath<'m>>,
P::Error: Into<Error>,
{
if idx >= MAX_ARGS {
return Err(Error::InvalidMatchRule);
}
let value = (idx, arg_path.try_into().map_err(Into::into)?);
let vec_idx = match self.0.arg_paths().binary_search_by(|(i, _)| i.cmp(&idx)) {
Ok(i) => {
// If the argument is already present, replace it.
self.0.arg_paths.remove(i);
i
}
Err(i) => i,
};
self.0.arg_paths.insert(vec_idx, value);
Ok(self)
}
/// Set 0th argument's namespace.
pub fn arg0namespace<I>(mut self, namespace: I) -> Result<Self>
where
I: TryInto<InterfaceName<'m>>,
I::Error: Into<Error>,
{
self.0.arg0namespace = Some(namespace.try_into().map_err(Into::into)?);
Ok(self)
}
/// Create a builder for `MatchRuleBuilder`.
pub(crate) fn new() -> Self {
Self(MatchRule {
msg_type: None,
sender: None,
interface: None,
member: None,
path_spec: None,
destination: None,
args: Vec::with_capacity(MAX_ARGS as usize),
arg_paths: Vec::with_capacity(MAX_ARGS as usize),
arg0namespace: None,
})
}
}