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use std;
use rusqlite;
use core_traits::{
ValueTypeSet,
};
use db_traits::errors::DbError;
use edn::query::{
PlainSymbol,
};
use query_pull_traits::errors::{
PullError,
};
use aggregates::{
SimpleAggregationOp,
};
pub type Result<T> = std::result::Result<T, ProjectorError>;
#[derive(Debug, Fail)]
pub enum ProjectorError {
#[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),
#[fail(display = "cannot find type for variable {:?}", _0)]
NoTypeAvailableForVariable(PlainSymbol),
#[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),
#[fail(display = "min/max expressions: {} (max 1), corresponding: {}", _0, _1)]
AmbiguousAggregates(usize, usize),
#[fail(display = "SQL error: {}", _0)]
RusqliteError(String),
#[fail(display = "{}", _0)]
DbError(#[cause] DbError),
#[fail(display = "{}", _0)]
PullError(#[cause] PullError),
}
impl From<rusqlite::Error> for ProjectorError {
fn from(error: rusqlite::Error) -> ProjectorError {
ProjectorError::RusqliteError(error.to_string())
}
}
impl From<DbError> for ProjectorError {
fn from(error: DbError) -> ProjectorError {
ProjectorError::DbError(error)
}
}
impl From<PullError> for ProjectorError {
fn from(error: PullError) -> ProjectorError {
ProjectorError::PullError(error)
}
}