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mod.rs
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mod.rs
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use std::sync::Arc;
use crate::{
bitmap::Bitmap,
buffer::Buffer,
datatypes::{DataType, Field},
};
use super::{
display_fmt, new_empty_array,
specification::{check_offsets, Offset},
Array,
};
mod ffi;
mod iterator;
pub use iterator::*;
mod mutable;
pub use mutable::*;
#[derive(Debug, Clone)]
pub struct ListArray<O: Offset> {
data_type: DataType,
offsets: Buffer<O>,
values: Arc<dyn Array>,
validity: Option<Bitmap>,
offset: usize,
}
impl<O: Offset> ListArray<O> {
pub fn new_empty(data_type: DataType) -> Self {
let values = new_empty_array(Self::get_child_type(&data_type).clone()).into();
Self::from_data(data_type, Buffer::from(&[O::zero()]), values, None)
}
#[inline]
pub fn new_null(data_type: DataType, length: usize) -> Self {
let child = Self::get_child_type(&data_type).clone();
Self::from_data(
data_type,
Buffer::new_zeroed(length + 1),
new_empty_array(child).into(),
Some(Bitmap::new_zeroed(length)),
)
}
pub fn from_data(
data_type: DataType,
offsets: Buffer<O>,
values: Arc<dyn Array>,
validity: Option<Bitmap>,
) -> Self {
check_offsets(&offsets, values.len());
// validate data_type
let child_data_type = Self::get_child_type(&data_type);
assert_eq!(
child_data_type,
values.data_type(),
"The child's datatype must match the inner type of the \'data_type\'"
);
Self {
data_type,
offsets,
values,
validity,
offset: 0,
}
}
/// Returns the element at index `i`
#[inline]
pub fn value(&self, i: usize) -> Box<dyn Array> {
if self.is_null(i) {
new_empty_array(self.values.data_type().clone())
} else {
let offsets = self.offsets.as_slice();
let offset = offsets[i];
let offset_1 = offsets[i + 1];
let length = (offset_1 - offset).to_usize();
self.values.slice(offset.to_usize(), length)
}
}
/// Returns the element at index `i` as &str
/// # Safety
/// Assumes that the `i < self.len`.
#[inline]
pub unsafe fn value_unchecked(&self, i: usize) -> Box<dyn Array> {
let offset = *self.offsets.as_ptr().add(i);
let offset_1 = *self.offsets.as_ptr().add(i + 1);
let length = (offset_1 - offset).to_usize();
self.values.slice(offset.to_usize(), length)
}
pub fn slice(&self, offset: usize, length: usize) -> Self {
let validity = self.validity.clone().map(|x| x.slice(offset, length));
let offsets = self.offsets.clone().slice(offset, length + 1);
Self {
data_type: self.data_type.clone(),
offsets,
values: self.values.clone(),
validity,
offset: self.offset + offset,
}
}
#[inline]
pub fn offsets(&self) -> &Buffer<O> {
&self.offsets
}
#[inline]
pub fn values(&self) -> &Arc<dyn Array> {
&self.values
}
}
impl<O: Offset> ListArray<O> {
#[inline]
pub fn default_datatype(data_type: DataType) -> DataType {
let field = Box::new(Field::new("item", data_type, true));
if O::is_large() {
DataType::LargeList(field)
} else {
DataType::List(field)
}
}
#[inline]
pub fn get_child_field(data_type: &DataType) -> &Field {
if O::is_large() {
match data_type {
DataType::LargeList(child) => child.as_ref(),
_ => panic!("Wrong DataType"),
}
} else {
match data_type {
DataType::List(child) => child.as_ref(),
_ => panic!("Wrong DataType"),
}
}
}
#[inline]
pub fn get_child_type(data_type: &DataType) -> &DataType {
Self::get_child_field(data_type).data_type()
}
}
impl<O: Offset> Array for ListArray<O> {
#[inline]
fn as_any(&self) -> &dyn std::any::Any {
self
}
#[inline]
fn len(&self) -> usize {
self.offsets.len() - 1
}
#[inline]
fn data_type(&self) -> &DataType {
&self.data_type
}
#[inline]
fn validity(&self) -> &Option<Bitmap> {
&self.validity
}
fn slice(&self, offset: usize, length: usize) -> Box<dyn Array> {
Box::new(self.slice(offset, length))
}
}
impl<O: Offset> std::fmt::Display for ListArray<O> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let head = if O::is_large() {
"LargeListArray"
} else {
"ListArray"
};
display_fmt(self.iter(), head, f, true)
}
}