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pub trait Validation {
fn validate(&self) -> Result<(), ValidationError>;
}
#[derive(Debug)]
pub struct ValidationError {
messages: Vec<String>,
}
impl std::fmt::Display for ValidationError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
for msg in &self.messages {
write!(f, "{}\n", msg)?;
}
Ok(())
}
}
impl std::error::Error for ValidationError { }
pub fn add_results(first: Result<(), ValidationError>, second: Result<(), ValidationError>) -> Result<(), ValidationError> {
if first.is_ok() && second.is_ok() {
Ok(())
} else if first.is_ok() && second.is_err() {
second
} else if first.is_err() && second.is_ok() {
first
} else {
let mut first = first.err().unwrap();
let mut second = second.err().unwrap();
first.messages.append(&mut second.messages);
Err( ValidationError{ messages: first.messages } )
}
}
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