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mod format;
pub mod source;
use source::Source;
use error::*;
use value::Value;
use std::collections::HashMap;
use self::source::FileSource;
pub use self::format::FileFormat;
pub struct File<T>
where T: FileSource
{
source: T,
/// Namespace to restrict configuration from the file
namespace: Option<String>,
/// Format of file (which dictates what driver to use).
format: Option<FileFormat>,
/// A required File will error if it cannot be found
required: bool,
}
impl File<source::string::FileSourceString> {
pub fn from_str(s: &str, format: FileFormat) -> Self {
File {
format: Some(format),
required: true,
namespace: None,
source: s.into(),
}
}
}
impl File<source::file::FileSourceFile> {
pub fn new(name: &str, format: FileFormat) -> Self {
File {
format: Some(format),
required: true,
namespace: None,
source: source::file::FileSourceFile::new(name),
}
}
}
impl<T: FileSource> File<T> {
pub fn required(mut self, required: bool) -> Self {
self.required = required;
self
}
pub fn namespace(mut self, namespace: &str) -> Self {
self.namespace = Some(namespace.into());
self
}
}
impl<T: FileSource> Source for File<T> {
fn collect(&self) -> Result<HashMap<String, Value>> {
// Coerce the file contents to a string
let (uri, contents) = match self.source.resolve(self.format).map_err(|err| {
ConfigError::Foreign(err)
}) {
Ok((uri, contents)) => (uri, contents),
Err(error) => {
if !self.required {
return Ok(HashMap::new());
}
return Err(error);
}
};
// Parse the string using the given format
let result = self.format.unwrap().parse(uri.as_ref(), &contents, self.namespace.as_ref()).map_err(|cause| {
ConfigError::FileParse {
uri: uri,
cause: cause
}
});
if result.is_err() && !self.required {
// Ignore fails and just go with it if its not required
Ok(HashMap::new())
} else {
result
}
}
}
|
