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#[cfg(feature = "filesystem")]
use crate::package::FsPackage;
use crate::package::{CorePackage, Package, RawPackage};
use crate::LoadingConfig;
use melodium_common::descriptor::{
Collection, Context, Entry, Function, Identifier, Loader as LoaderTrait, LoadingError, Model,
Treatment,
};
use std::collections::HashMap;
use std::path::PathBuf;
use std::sync::{Arc, RwLock, RwLockReadGuard};
#[derive(Debug)]
pub struct Loader {
collection: RwLock<Collection>,
packages: RwLock<HashMap<String, Box<dyn Package>>>,
search_locations: Vec<PathBuf>,
}
impl Loader {
pub fn new(config: LoadingConfig) -> Self {
Self {
collection: RwLock::new(Collection::new()),
packages: RwLock::new(
config
.core_packages
.into_iter()
.map(|p| {
(
p.name().to_string(),
Box::new(CorePackage::new(p)) as Box<dyn Package>,
)
})
.collect(),
),
search_locations: config.search_locations,
}
}
pub fn load_package(&self, name: &str) -> Result<(), LoadingError> {
if !self.packages.read().unwrap().contains_key(name) {
for location in &self.search_locations {
let mut path = location.clone();
path.push(name);
if path.exists() {
#[cfg(feature = "filesystem")]
if let Ok(package) = FsPackage::new(&path) {
for req in package.requirements() {
self.load_package(req)?;
}
self.packages
.write()
.unwrap()
.insert(name.to_string(), Box::new(package));
return Ok(());
}
}
}
Err(LoadingError::NoPackage)
} else {
Ok(())
}
}
pub fn load_raw(&self, raw_content: &str) -> Result<String, LoadingError> {
let package = RawPackage::new(raw_content)?;
let name = package.name().to_string();
self.packages
.write()
.unwrap()
.insert(package.name().to_string(), Box::new(package));
Ok(name)
}
pub fn load(&self, identifier: &Identifier) -> Result<Collection, LoadingError> {
self.get_with_load(identifier)?;
Ok(self.collection.read().unwrap().clone())
}
pub fn full_load(&self) -> Result<Collection, LoadingError> {
for (_name, package) in self.packages.read().unwrap().iter() {
let additions = package.full_collection(self)?;
self.add_collection(additions);
}
Ok(self.collection.read().unwrap().clone())
}
pub fn build(&self) -> Result<Arc<Collection>, LoadingError> {
let collection = Arc::new(self.collection.read().unwrap().clone());
for (_name, package) in self.packages.read().unwrap().iter() {
package.make_building(&collection)?;
}
Ok(collection)
}
pub fn collection(&self) -> RwLockReadGuard<Collection> {
self.collection.read().unwrap()
}
pub fn get_with_load(&self, identifier: &Identifier) -> Result<Entry, LoadingError> {
let entry = self.collection.read().unwrap().get(identifier).cloned();
if let Some(entry) = entry {
Ok(entry)
} else if let Some(package) = self.packages.read().unwrap().get(identifier.root()) {
let additions = package.element(self, identifier)?;
self.add_collection(additions);
Ok(self
.collection
.read()
.unwrap()
.get(identifier)
.unwrap()
.clone())
} else {
Err(LoadingError::NoPackage)
}
}
fn add_collection(&self, other_collection: Collection) {
let existing = self.collection.read().unwrap().identifiers();
let mut others = other_collection.identifiers();
others.retain(|id| !existing.contains(id));
if !others.is_empty() {
let mut collection = self.collection.write().unwrap();
for id in &others {
collection.insert(other_collection.get(id).unwrap().clone());
}
}
}
}
impl LoaderTrait for Loader {
fn load_context(&self, identifier: &Identifier) -> Result<Arc<dyn Context>, LoadingError> {
match self.get_with_load(identifier)? {
Entry::Context(context) => Ok(context),
_ => Err(LoadingError::ContextExpected),
}
}
fn load_function(&self, identifier: &Identifier) -> Result<Arc<dyn Function>, LoadingError> {
match self.get_with_load(identifier)? {
Entry::Function(function) => Ok(function),
_ => Err(LoadingError::FunctionExpected),
}
}
fn load_model(&self, identifier: &Identifier) -> Result<Arc<dyn Model>, LoadingError> {
match self.get_with_load(identifier)? {
Entry::Model(model) => Ok(model),
_ => Err(LoadingError::ModelExpected),
}
}
fn load_treatment(&self, identifier: &Identifier) -> Result<Arc<dyn Treatment>, LoadingError> {
match self.get_with_load(identifier)? {
Entry::Treatment(treatment) => Ok(treatment),
_ => Err(LoadingError::TreatmentExpected),
}
}
}