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iterator.rs
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iterator.rs
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use crate::array::{Array, IterableListArray};
use crate::bitmap::utils::{zip_validity, ZipValidity};
use crate::{array::Offset, trusted_len::TrustedLen};
use super::ListArray;
/// Iterator of values of an [`ListArray`].
pub struct ListValuesIter<'a, A: IterableListArray> {
array: &'a A,
index: usize,
end: usize,
}
impl<'a, A: IterableListArray> ListValuesIter<'a, A> {
#[inline]
pub fn new(array: &'a A) -> Self {
Self {
array,
index: 0,
end: array.len(),
}
}
}
impl<'a, A: IterableListArray> Iterator for ListValuesIter<'a, A> {
type Item = Box<dyn Array>;
#[inline]
fn next(&mut self) -> Option<Self::Item> {
if self.index == self.end {
return None;
}
let old = self.index;
self.index += 1;
Some(self.array.value(old))
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
(self.end - self.index, Some(self.end - self.index))
}
}
unsafe impl<'a, A: IterableListArray> TrustedLen for ListValuesIter<'a, A> {}
impl<'a, A: IterableListArray> DoubleEndedIterator for ListValuesIter<'a, A> {
#[inline]
fn next_back(&mut self) -> Option<Self::Item> {
if self.index == self.end {
None
} else {
self.end -= 1;
Some(self.array.value(self.end))
}
}
}
impl<O: Offset> IterableListArray for ListArray<O> {
fn value(&self, i: usize) -> Box<dyn Array> {
ListArray::<O>::value(self, i)
}
}
type ValuesIter<'a, O> = ListValuesIter<'a, ListArray<O>>;
type ZipIter<'a, O> = ZipValidity<'a, Box<dyn Array>, ValuesIter<'a, O>>;
impl<'a, O: Offset> IntoIterator for &'a ListArray<O> {
type Item = Option<Box<dyn Array>>;
type IntoIter = ZipIter<'a, O>;
fn into_iter(self) -> Self::IntoIter {
self.iter()
}
}
impl<'a, O: Offset> ListArray<O> {
/// Returns an iterator of `Option<Box<dyn Array>>`
pub fn iter(&'a self) -> ZipIter<'a, O> {
zip_validity(
ListValuesIter::new(self),
self.validity.as_ref().map(|x| x.iter()),
)
}
/// Returns an iterator of `Box<dyn Array>`
pub fn values_iter(&'a self) -> ValuesIter<'a, O> {
ListValuesIter::new(self)
}
}