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use std::collections::HashMap;
use std::fmt::Debug;
use std::str::FromStr;
use crate::error::*;
use crate::path;
use crate::value::{Value, ValueKind};
/// Describes a generic _source_ of configuration properties.
pub trait Source: Debug {
fn clone_into_box(&self) -> Box<dyn Source + Send + Sync>;
/// Collect all configuration properties available from this source and return
/// a HashMap.
fn collect(&self) -> Result<HashMap<String, Value>>;
fn collect_to(&self, cache: &mut Value) -> Result<()> {
self.collect()?
.iter()
.for_each(|(key, val)| match path::Expression::from_str(key) {
// Set using the path
Ok(expr) => expr.set(cache, val.clone()),
// Set diretly anyway
_ => path::Expression::Identifier(key.clone()).set(cache, val.clone()),
});
Ok(())
}
}
impl Clone for Box<dyn Source + Send + Sync> {
fn clone(&self) -> Box<dyn Source + Send + Sync> {
self.clone_into_box()
}
}
impl Source for Vec<Box<dyn Source + Send + Sync>> {
fn clone_into_box(&self) -> Box<dyn Source + Send + Sync> {
Box::new((*self).clone())
}
fn collect(&self) -> Result<HashMap<String, Value>> {
let mut cache: Value = HashMap::<String, Value>::new().into();
for source in self {
source.collect_to(&mut cache)?;
}
if let ValueKind::Table(table) = cache.kind {
Ok(table)
} else {
unreachable!();
}
}
}
impl<T> Source for Vec<T>
where
T: Source + Sync + Send,
T: Clone,
T: 'static,
{
fn clone_into_box(&self) -> Box<dyn Source + Send + Sync> {
Box::new((*self).clone())
}
fn collect(&self) -> Result<HashMap<String, Value>> {
let mut cache: Value = HashMap::<String, Value>::new().into();
for source in self {
source.collect_to(&mut cache)?;
}
if let ValueKind::Table(table) = cache.kind {
Ok(table)
} else {
unreachable!();
}
}
}
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