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use std::fmt::{ Display, Formatter, Error as FmtError };
use std::error::Error;
use self::super::locktype::LockType;
#[derive(Debug, PartialEq, Eq)]
pub enum LockError {
UnknownError {
message: String
},
LockBusy,
InvalidParentLock,
InvalidParentLockType {
required: LockType,
actual: LockType
},
InvalidUpgrade {
original: LockType,
requested: LockType
},
}
impl Display for LockError {
fn fmt(&self, f: &mut Formatter) -> Result<(), FmtError> {
match self {
LockError::UnknownError { message } => write!(f, "Unknown error: {}", message),
LockError::LockBusy => write!(f, "Failed to acquire/upgrade lock; lock is busy"),
LockError::InvalidParentLock => write!(f, "Invalid parent lock"),
LockError::InvalidParentLockType { required, actual } => write!(f, "Invalid parent lock type; required: {}, actual: {}", required, actual),
LockError::InvalidUpgrade { original, requested } => write!(f, "Lock of type {} is not upgradable to type {}", original, requested),
}
}
}
impl Error for LockError {}
pub fn map_unknown_err<T: Error>(error: T) -> LockError { LockError::UnknownError { message: format!("{}", error) } }
pub type LockResult<T> = Result<T, LockError>;