| // 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::datatypes::DataType; |
| |
| /// A type that Rust's custom allocator knows how to allocate and deallocate. |
| /// This is implemented for all Arrow's physical types whose in-memory representation |
| /// matches Rust's physical types. Consider this trait sealed. |
| /// # Safety |
| /// Do not implement this trait. |
| pub unsafe trait NativeType: |
| Sized + Copy + std::fmt::Debug + std::fmt::Display + PartialEq + Default + Sized + 'static |
| { |
| type Bytes: AsRef<[u8]>; |
| |
| /// Whether a DataType is a valid type for this physical representation. |
| fn is_valid(data_type: &DataType) -> bool; |
| |
| /// How this type represents itself as bytes in little endianess. |
| /// This is used for IPC, where data is communicated with a specific endianess. |
| fn to_le_bytes(&self) -> Self::Bytes; |
| } |
| |
| macro_rules! create_native { |
| ($native_ty:ty,$($impl_pattern:pat)|+) => { |
| unsafe impl NativeType for $native_ty { |
| type Bytes = [u8; std::mem::size_of::<Self>()]; |
| |
| #[inline] |
| fn to_le_bytes(&self) -> Self::Bytes { |
| Self::to_le_bytes(*self) |
| } |
| |
| #[inline] |
| fn is_valid(data_type: &DataType) -> bool { |
| matches!(data_type, $($impl_pattern)|+) |
| } |
| } |
| }; |
| } |
| |
| create_native!(u8, DataType::UInt8); |
| create_native!(u16, DataType::UInt16); |
| create_native!(u32, DataType::UInt32); |
| create_native!(u64, DataType::UInt64); |
| create_native!(i8, DataType::Int8); |
| create_native!(i16, DataType::Int16); |
| create_native!( |
| i32, |
| DataType::Int32 | DataType::Date32 | DataType::Time32(_) |
| ); |
| create_native!( |
| i64, |
| DataType::Int64 | DataType::Date64 | DataType::Time64(_) | DataType::Timestamp(_, _) |
| ); |
| create_native!(f32, DataType::Float32); |
| create_native!(f64, DataType::Float64); |