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// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements. See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership. The ASF licenses this file

// 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

//

// 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.

use crate::expr::PyExpr;

use pyo3::prelude::*;

use std::fmt::{self, Display, Formatter};

use datafusion::logical_expr::expr::Alias;

#[pyclass(name = "Alias", module = "datafusion.expr", subclass)]

#[derive(Clone)]

pub struct PyAlias {

alias: Alias,

}

impl From<Alias> for PyAlias {

fn from(alias: Alias) -> Self {

Self { alias }

}

}

impl From<PyAlias> for Alias {

fn from(py_alias: PyAlias) -> Self {

py_alias.alias

}

}

impl Display for PyAlias {

fn fmt(&self, f: &mut Formatter) -> fmt::Result {

write!(

f,

"Alias

\nExpr: `{:?}`

\nAlias Name: `{}`",

&self.alias.expr, &self.alias.name

)

}

}

#[pymethods]

impl PyAlias {

/// Retrieve the "name" of the alias

fn alias(&self) -> PyResult<String> {

Ok(self.alias.name.clone())

}

fn expr(&self) -> PyResult<PyExpr> {

Ok((*self.alias.expr.clone()).into())

}

/// Get a String representation of this column

fn __repr__(&self) -> String {

format!("{}", self)

}

}