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use crate::{bitmap::Bitmap, datatypes::DataType};
use crate::{
array::{Array, FromFfi, ToFfi},
datatypes::PhysicalType,
error::Error,
ffi,
};
#[derive(Clone)]
pub struct NullArray {
data_type: DataType,
length: usize,
}
impl NullArray {
pub fn try_new(data_type: DataType, length: usize) -> Result<Self, Error> {
if data_type.to_physical_type() != PhysicalType::Null {
return Err(Error::oos(
"NullArray can only be initialized with a DataType whose physical type is Boolean",
));
}
Ok(Self { data_type, length })
}
pub fn new(data_type: DataType, length: usize) -> Self {
Self::try_new(data_type, length).unwrap()
}
pub fn from_data(data_type: DataType, length: usize) -> Self {
Self::new(data_type, length)
}
pub fn new_empty(data_type: DataType) -> Self {
Self::new(data_type, 0)
}
pub fn new_null(data_type: DataType, length: usize) -> Self {
Self::new(data_type, length)
}
pub fn boxed(self) -> Box<dyn Array> {
Box::new(self)
}
pub fn arced(self) -> std::sync::Arc<dyn Array> {
std::sync::Arc::new(self)
}
}
impl NullArray {
pub fn slice(&self, _offset: usize, length: usize) -> Self {
Self {
data_type: self.data_type.clone(),
length,
}
}
#[inline]
fn len(&self) -> usize {
self.length
}
}
impl Array for NullArray {
#[inline]
fn as_any(&self) -> &dyn std::any::Any {
self
}
#[inline]
fn as_any_mut(&mut self) -> &mut dyn std::any::Any {
self
}
#[inline]
fn len(&self) -> usize {
self.len()
}
#[inline]
fn data_type(&self) -> &DataType {
&DataType::Null
}
fn validity(&self) -> Option<&Bitmap> {
None
}
fn slice(&self, offset: usize, length: usize) -> Box<dyn Array> {
Box::new(self.slice(offset, length))
}
unsafe fn slice_unchecked(&self, offset: usize, length: usize) -> Box<dyn Array> {
Box::new(self.slice(offset, length))
}
fn with_validity(&self, _: Option<Bitmap>) -> Box<dyn Array> {
panic!("cannot set validity of a null array")
}
fn to_boxed(&self) -> Box<dyn Array> {
Box::new(self.clone())
}
}
impl std::fmt::Debug for NullArray {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "NullArray({})", self.len())
}
}
unsafe impl ToFfi for NullArray {
fn buffers(&self) -> Vec<Option<*const u8>> {
vec![None]
}
fn offset(&self) -> Option<usize> {
Some(0)
}
fn to_ffi_aligned(&self) -> Self {
self.clone()
}
}
impl<A: ffi::ArrowArrayRef> FromFfi<A> for NullArray {
unsafe fn try_from_ffi(array: A) -> Result<Self, Error> {
let data_type = array.data_type().clone();
Self::try_new(data_type, array.array().len())
}
}