// 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::ArrayData;

use arrow_buffer::ArrowNativeType;

use std::mem::size_of;

use std::ops::Add;

use super::{Extend, _MutableArrayData};

pub(super) fn build_extend<T: ArrowNativeType>(array: &ArrayData) -> Extend<'_> {

    let values = array.buffer::<T>(0);

    Box::new(

        move |mutable: &mut _MutableArrayData, _, start: usize, len: usize| {

            mutable

                .buffer1

                .extend_from_slice(&values[start..start + len]);

        },

    )

}

pub(super) fn build_extend_with_offset<T>(array: &ArrayData, offset: T) -> Extend<'_>

where

    T: ArrowNativeType + Add<Output = T>,

{

    let values = array.buffer::<T>(0);

    Box::new(

        move |mutable: &mut _MutableArrayData, _, start: usize, len: usize| {

            mutable

                .buffer1

                .extend(values[start..start + len].iter().map(|x| *x + offset));

        },

    )

}

pub(super) fn extend_nulls<T: ArrowNativeType>(mutable: &mut _MutableArrayData, len: usize) {

    mutable.buffer1.extend_zeros(len * size_of::<T>());

}