mentat/query-projector/src/errors.rs

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// Copyright 2018 Mozilla
//
// Licensed 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
// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.
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use std; // To refer to std::result::Result.
use rusqlite;
use mentat_core::{
ValueTypeSet,
};
use mentat_db;
use mentat_query::{
PlainSymbol,
};
use mentat_query_pull;
use aggregates::{
SimpleAggregationOp,
};
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#[macro_export]
macro_rules! bail {
($e:expr) => (
return Err($e.into());
)
}
pub type Result<T> = std::result::Result<T, ProjectorError>;
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#[derive(Debug, Fail)]
pub enum ProjectorError {
/// We're just not done yet. Message that the feature is recognized but not yet
/// implemented.
#[fail(display = "not yet implemented: {}", _0)]
NotYetImplemented(String),
#[fail(display = "no possible types for value provided to {:?}", _0)]
CannotProjectImpossibleBinding(SimpleAggregationOp),
#[fail(display = "cannot apply projection operation {:?} to types {:?}", _0, _1)]
CannotApplyAggregateOperationToTypes(SimpleAggregationOp, ValueTypeSet),
#[fail(display = "invalid projection: {}", _0)]
InvalidProjection(String),
#[fail(display = "cannot project unbound variable {:?}", _0)]
UnboundVariable(PlainSymbol),
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#[fail(display = "cannot find type for variable {:?}", _0)]
NoTypeAvailableForVariable(PlainSymbol),
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#[fail(display = "expected {}, got {}", _0, _1)]
UnexpectedResultsType(&'static str, &'static str),
#[fail(display = "expected tuple of length {}, got tuple of length {}", _0, _1)]
UnexpectedResultsTupleLength(usize, usize),
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#[fail(display = "min/max expressions: {} (max 1), corresponding: {}", _0, _1)]
AmbiguousAggregates(usize, usize),
// It would be better to capture the underlying `rusqlite::Error`, but that type doesn't
// implement many useful traits, including `Clone`, `Eq`, and `PartialEq`.
#[fail(display = "SQL error: {}", _0)]
RusqliteError(String),
#[fail(display = "{}", _0)]
DbError(#[cause] mentat_db::DbError),
#[fail(display = "{}", _0)]
PullError(#[cause] mentat_query_pull::PullError),
}
impl From<rusqlite::Error> for ProjectorError {
fn from(error: rusqlite::Error) -> ProjectorError {
ProjectorError::RusqliteError(error.to_string())
}
}
impl From<mentat_db::DbError> for ProjectorError {
fn from(error: mentat_db::DbError) -> ProjectorError {
ProjectorError::DbError(error)
}
}
impl From<mentat_query_pull::PullError> for ProjectorError {
fn from(error: mentat_query_pull::PullError) -> ProjectorError {
ProjectorError::PullError(error)
}
}