asset_resolver/
chain.rs

1use std::path::PathBuf;
2
3use crate::AssetResolver;
4
5/// An asset resolver that chains sub-resolvers together to
6/// attempt to resolve a path using multiple ordered methods.
7pub struct ResolverChain {
8    resolvers: Vec<Box<dyn AssetResolver>>,
9}
10
11impl ResolverChain {
12    /// Construct a new resolver chain.
13    ///
14    /// # Example
15    /// ```
16    /// # use asset_resolver::*;
17    /// let resolver = ResolverChain::new(vec![
18    ///   Box::new(NullResolver),
19    ///   Box::new(DefaultResolver),
20    /// ]);
21    /// ```
22    pub fn new(resolvers: Vec<Box<dyn AssetResolver>>) -> Self {
23        Self { resolvers }
24    }
25}
26
27impl AssetResolver for ResolverChain {
28
29    /// Attempt to resolve a path using the resolvers in the chain.
30    /// 
31    /// # Example
32    /// ```
33    /// # use asset_resolver::*;
34    /// let resolver = ResolverChain::new(vec![
35    ///   Box::new(NullResolver),
36    ///   Box::new(DefaultResolver),
37    /// ]);
38    /// 
39    /// let path = resolver.resolve("/home/user/assets/test.png").unwrap();
40    /// assert_eq!(path.to_str().unwrap(), "/home/user/assets/test.png");
41    /// ```
42    fn resolve(&self, path: &str) -> Option<PathBuf> {
43        for resolver in &self.resolvers {
44            if let Some(path) = resolver.resolve(path) {
45                return Some(path);
46            }
47        }
48        None
49    }
50}
51
asset_resolver/chain.rs

asset_resolver/
chain.rs
