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use crate::array::{
ArrayBuilder, ArrayData, ArrayRef, FixedSizeBinaryArray, UInt8BufferBuilder,
};
use crate::datatypes::DataType;
use crate::error::{ArrowError, Result};
use std::any::Any;
use std::sync::Arc;
use super::BooleanBufferBuilder;
#[derive(Debug)]
pub struct FixedSizeBinaryBuilder {
values_builder: UInt8BufferBuilder,
bitmap_builder: BooleanBufferBuilder,
value_length: i32,
}
impl FixedSizeBinaryBuilder {
pub fn new(capacity: usize, byte_width: i32) -> Self {
assert!(
byte_width >= 0,
"value length ({}) of the array must >= 0",
byte_width
);
Self {
values_builder: UInt8BufferBuilder::new(capacity),
bitmap_builder: BooleanBufferBuilder::new(if byte_width > 0 {
capacity / byte_width as usize
} else {
0
}),
value_length: byte_width,
}
}
#[inline]
pub fn append_value(&mut self, value: impl AsRef<[u8]>) -> Result<()> {
if self.value_length != value.as_ref().len() as i32 {
Err(ArrowError::InvalidArgumentError(
"Byte slice does not have the same length as FixedSizeBinaryBuilder value lengths".to_string()
))
} else {
self.values_builder.append_slice(value.as_ref());
self.bitmap_builder.append(true);
Ok(())
}
}
#[inline]
pub fn append_null(&mut self) {
self.values_builder
.append_slice(&vec![0u8; self.value_length as usize][..]);
self.bitmap_builder.append(false);
}
pub fn finish(&mut self) -> FixedSizeBinaryArray {
let array_length = self.len();
let array_data_builder =
ArrayData::builder(DataType::FixedSizeBinary(self.value_length))
.add_buffer(self.values_builder.finish())
.null_bit_buffer(Some(self.bitmap_builder.finish()))
.len(array_length);
let array_data = unsafe { array_data_builder.build_unchecked() };
FixedSizeBinaryArray::from(array_data)
}
}
impl ArrayBuilder for FixedSizeBinaryBuilder {
fn as_any(&self) -> &dyn Any {
self
}
fn as_any_mut(&mut self) -> &mut dyn Any {
self
}
fn into_box_any(self: Box<Self>) -> Box<dyn Any> {
self
}
fn len(&self) -> usize {
self.bitmap_builder.len()
}
fn is_empty(&self) -> bool {
self.bitmap_builder.is_empty()
}
fn finish(&mut self) -> ArrayRef {
Arc::new(self.finish())
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::array::Array;
use crate::array::FixedSizeBinaryArray;
use crate::datatypes::DataType;
#[test]
fn test_fixed_size_binary_builder() {
let mut builder = FixedSizeBinaryBuilder::new(15, 5);
builder.append_value(b"hello").unwrap();
builder.append_null();
builder.append_value(b"arrow").unwrap();
let array: FixedSizeBinaryArray = builder.finish();
assert_eq!(&DataType::FixedSizeBinary(5), array.data_type());
assert_eq!(3, array.len());
assert_eq!(1, array.null_count());
assert_eq!(10, array.value_offset(2));
assert_eq!(5, array.value_length());
}
#[test]
fn test_fixed_size_binary_builder_with_zero_value_length() {
let mut builder = FixedSizeBinaryBuilder::new(0, 0);
builder.append_value(b"").unwrap();
builder.append_null();
builder.append_value(b"").unwrap();
assert!(!builder.is_empty());
let array: FixedSizeBinaryArray = builder.finish();
assert_eq!(&DataType::FixedSizeBinary(0), array.data_type());
assert_eq!(3, array.len());
assert_eq!(1, array.null_count());
assert_eq!(0, array.value_offset(2));
assert_eq!(0, array.value_length());
assert_eq!(b"", array.value(0));
assert_eq!(b"", array.value(2));
}
#[test]
#[should_panic(
expected = "Byte slice does not have the same length as FixedSizeBinaryBuilder value lengths"
)]
fn test_fixed_size_binary_builder_with_inconsistent_value_length() {
let mut builder = FixedSizeBinaryBuilder::new(15, 4);
builder.append_value(b"hello").unwrap();
}
#[test]
fn test_fixed_size_binary_builder_empty() {
let mut builder = FixedSizeBinaryBuilder::new(15, 5);
assert!(builder.is_empty());
let fixed_size_binary_array = builder.finish();
assert_eq!(
&DataType::FixedSizeBinary(5),
fixed_size_binary_array.data_type()
);
assert_eq!(0, fixed_size_binary_array.len());
}
#[test]
#[should_panic(expected = "value length (-1) of the array must >= 0")]
fn test_fixed_size_binary_builder_invalid_value_length() {
let _ = FixedSizeBinaryBuilder::new(15, -1);
}
}