rust/arrow/src/error.rs

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// distributed with this work for additional information
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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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//! Defines `ArrowError` for representing failures in various Arrow operations
use std::error::Error;

use csv as csv_crate;

/// Many different operations in the `arrow` crate return this error type
#[derive(Debug, Clone, PartialEq)]
pub enum ArrowError {
    MemoryError(String),
    ParseError(String),
    ComputeError(String),
    DivideByZero,
    CsvError(String),
    JsonError(String),
    IoError(String),
    InvalidArgumentError(String),
}

impl From<::std::io::Error> for ArrowError {
    fn from(error: ::std::io::Error) -> Self {
        ArrowError::IoError(error.description().to_string())
    }
}

impl From<csv_crate::Error> for ArrowError {
    fn from(error: csv_crate::Error) -> Self {
        match error.kind() {
            csv_crate::ErrorKind::Io(error) => {
                ArrowError::CsvError(error.description().to_string())
            }
            csv_crate::ErrorKind::Utf8 { pos: _, err } => ArrowError::CsvError(format!(
                "Encountered UTF-8 error while reading CSV file: {:?}",
                err.description()
            )),
            csv_crate::ErrorKind::UnequalLengths {
                pos: _,
                expected_len,
                len,
            } => ArrowError::CsvError(format!(
                "Encountered unequal lengths between records on CSV file. Expected {} \
                 records, found {} records",
                len, expected_len
            )),
            _ => ArrowError::CsvError("Error reading CSV file".to_string()),
        }
    }
}

impl From<::std::string::FromUtf8Error> for ArrowError {
    fn from(error: ::std::string::FromUtf8Error) -> Self {
        ArrowError::ParseError(error.description().to_string())
    }
}

pub type Result<T> = ::std::result::Result<T, ArrowError>;