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| </pre></div><pre class="rust"><code><span class="comment">// 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. |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::buffer::ScalarBuffer; |
| <span class="kw">use crate</span>::{ArrowNativeType, MutableBuffer, OffsetBufferBuilder}; |
| <span class="kw">use </span>std::ops::Deref; |
| |
| <span class="doccomment">/// A non-empty buffer of monotonically increasing, positive integers. |
| /// |
| /// [`OffsetBuffer`] are used to represent ranges of offsets. An |
| /// `OffsetBuffer` of `N+1` items contains `N` such ranges. The start |
| /// offset for element `i` is `offsets[i]` and the end offset is |
| /// `offsets[i+1]`. Equal offsets represent an empty range. |
| /// |
| /// # Example |
| /// |
| /// This example shows how 5 distinct ranges, are represented using a |
| /// 6 entry `OffsetBuffer`. The first entry `(0, 3)` represents the |
| /// three offsets `0, 1, 2`. The entry `(3,3)` represent no offsets |
| /// (e.g. an empty list). |
| /// |
| /// ```text |
| /// ┌───────┐ ┌───┐ |
| /// │ (0,3) │ │ 0 │ |
| /// ├───────┤ ├───┤ |
| /// │ (3,3) │ │ 3 │ |
| /// ├───────┤ ├───┤ |
| /// │ (3,4) │ │ 3 │ |
| /// ├───────┤ ├───┤ |
| /// │ (4,5) │ │ 4 │ |
| /// ├───────┤ ├───┤ |
| /// │ (5,7) │ │ 5 │ |
| /// └───────┘ ├───┤ |
| /// │ 7 │ |
| /// └───┘ |
| /// |
| /// Offsets Buffer |
| /// Logical |
| /// Offsets |
| /// |
| /// (offsets[i], |
| /// offsets[i+1]) |
| /// ``` |
| </span><span class="attr">#[derive(Debug, Clone)] |
| </span><span class="kw">pub struct </span>OffsetBuffer<O: ArrowNativeType>(ScalarBuffer<O>); |
| |
| <span class="kw">impl</span><O: ArrowNativeType> OffsetBuffer<O> { |
| <span class="doccomment">/// Create a new [`OffsetBuffer`] from the provided [`ScalarBuffer`] |
| /// |
| /// # Panics |
| /// |
| /// Panics if `buffer` is not a non-empty buffer containing |
| /// monotonically increasing values greater than or equal to zero |
| </span><span class="kw">pub fn </span>new(buffer: ScalarBuffer<O>) -> <span class="self">Self </span>{ |
| <span class="macro">assert!</span>(!buffer.is_empty(), <span class="string">"offsets cannot be empty"</span>); |
| <span class="macro">assert!</span>( |
| buffer[<span class="number">0</span>] >= O::usize_as(<span class="number">0</span>), |
| <span class="string">"offsets must be greater than 0" |
| </span>); |
| <span class="macro">assert!</span>( |
| buffer.windows(<span class="number">2</span>).all(|w| w[<span class="number">0</span>] <= w[<span class="number">1</span>]), |
| <span class="string">"offsets must be monotonically increasing" |
| </span>); |
| <span class="self">Self</span>(buffer) |
| } |
| |
| <span class="doccomment">/// Create a new [`OffsetBuffer`] from the provided [`ScalarBuffer`] |
| /// |
| /// # Safety |
| /// |
| /// `buffer` must be a non-empty buffer containing monotonically increasing |
| /// values greater than or equal to zero |
| </span><span class="kw">pub unsafe fn </span>new_unchecked(buffer: ScalarBuffer<O>) -> <span class="self">Self </span>{ |
| <span class="self">Self</span>(buffer) |
| } |
| |
| <span class="doccomment">/// Create a new [`OffsetBuffer`] containing a single 0 value |
| </span><span class="kw">pub fn </span>new_empty() -> <span class="self">Self </span>{ |
| <span class="kw">let </span>buffer = MutableBuffer::from_len_zeroed(std::mem::size_of::<O>()); |
| <span class="self">Self</span>(buffer.into_buffer().into()) |
| } |
| |
| <span class="doccomment">/// Create a new [`OffsetBuffer`] containing `len + 1` `0` values |
| </span><span class="kw">pub fn </span>new_zeroed(len: usize) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>len_bytes = len |
| .checked_add(<span class="number">1</span>) |
| .and_then(|o| o.checked_mul(std::mem::size_of::<O>())) |
| .expect(<span class="string">"overflow"</span>); |
| <span class="kw">let </span>buffer = MutableBuffer::from_len_zeroed(len_bytes); |
| <span class="self">Self</span>(buffer.into_buffer().into()) |
| } |
| |
| <span class="doccomment">/// Create a new [`OffsetBuffer`] from the iterator of slice lengths |
| /// |
| /// ``` |
| /// # use arrow_buffer::OffsetBuffer; |
| /// let offsets = OffsetBuffer::<i32>::from_lengths([1, 3, 5]); |
| /// assert_eq!(offsets.as_ref(), &[0, 1, 4, 9]); |
| /// ``` |
| /// |
| /// # Panics |
| /// |
| /// Panics on overflow |
| </span><span class="kw">pub fn </span>from_lengths<I>(lengths: I) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>I: IntoIterator<Item = usize>, |
| { |
| <span class="kw">let </span>iter = lengths.into_iter(); |
| <span class="kw">let </span><span class="kw-2">mut </span>out = Vec::with_capacity(iter.size_hint().<span class="number">0 </span>+ <span class="number">1</span>); |
| out.push(O::usize_as(<span class="number">0</span>)); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>acc = <span class="number">0_usize</span>; |
| <span class="kw">for </span>length <span class="kw">in </span>iter { |
| acc = acc.checked_add(length).expect(<span class="string">"usize overflow"</span>); |
| out.push(O::usize_as(acc)) |
| } |
| <span class="comment">// Check for overflow |
| </span>O::from_usize(acc).expect(<span class="string">"offset overflow"</span>); |
| <span class="self">Self</span>(out.into()) |
| } |
| |
| <span class="doccomment">/// Returns the inner [`ScalarBuffer`] |
| </span><span class="kw">pub fn </span>inner(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>ScalarBuffer<O> { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="number">0 |
| </span>} |
| |
| <span class="doccomment">/// Returns the inner [`ScalarBuffer`], consuming self |
| </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> ScalarBuffer<O> { |
| <span class="self">self</span>.<span class="number">0 |
| </span>} |
| |
| <span class="doccomment">/// Returns a zero-copy slice of this buffer with length `len` and starting at `offset` |
| </span><span class="kw">pub fn </span>slice(<span class="kw-2">&</span><span class="self">self</span>, offset: usize, len: usize) -> <span class="self">Self </span>{ |
| <span class="self">Self</span>(<span class="self">self</span>.<span class="number">0</span>.slice(offset, len.saturating_add(<span class="number">1</span>))) |
| } |
| |
| <span class="doccomment">/// Returns true if this [`OffsetBuffer`] is equal to `other`, using pointer comparisons |
| /// to determine buffer equality. This is cheaper than `PartialEq::eq` but may |
| /// return false when the arrays are logically equal |
| </span><span class="attr">#[inline] |
| </span><span class="kw">pub fn </span>ptr_eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <span class="self">self</span>.<span class="number">0</span>.ptr_eq(<span class="kw-2">&</span>other.<span class="number">0</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><T: ArrowNativeType> Deref <span class="kw">for </span>OffsetBuffer<T> { |
| <span class="kw">type </span>Target = [T]; |
| |
| <span class="attr">#[inline] |
| </span><span class="kw">fn </span>deref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="self">Self</span>::Target { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="number">0 |
| </span>} |
| } |
| |
| <span class="kw">impl</span><T: ArrowNativeType> AsRef<[T]> <span class="kw">for </span>OffsetBuffer<T> { |
| <span class="attr">#[inline] |
| </span><span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[T] { |
| <span class="self">self |
| </span>} |
| } |
| |
| <span class="kw">impl</span><O: ArrowNativeType> From<OffsetBufferBuilder<O>> <span class="kw">for </span>OffsetBuffer<O> { |
| <span class="kw">fn </span>from(value: OffsetBufferBuilder<O>) -> <span class="self">Self </span>{ |
| value.finish() |
| } |
| } |
| |
| <span class="attr">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attr">#[test] |
| #[should_panic(expected = <span class="string">"offsets cannot be empty"</span>)] |
| </span><span class="kw">fn </span>empty_offsets() { |
| OffsetBuffer::new(Vec::<i32>::new().into()); |
| } |
| |
| <span class="attr">#[test] |
| #[should_panic(expected = <span class="string">"offsets must be greater than 0"</span>)] |
| </span><span class="kw">fn </span>negative_offsets() { |
| OffsetBuffer::new(<span class="macro">vec!</span>[-<span class="number">1</span>, <span class="number">0</span>, <span class="number">1</span>].into()); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>offsets() { |
| OffsetBuffer::new(<span class="macro">vec!</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].into()); |
| |
| <span class="kw">let </span>offsets = OffsetBuffer::<i32>::new_zeroed(<span class="number">3</span>); |
| <span class="macro">assert_eq!</span>(offsets.as_ref(), <span class="kw-2">&</span>[<span class="number">0</span>; <span class="number">4</span>]); |
| |
| <span class="kw">let </span>offsets = OffsetBuffer::<i32>::new_zeroed(<span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(offsets.as_ref(), <span class="kw-2">&</span>[<span class="number">0</span>; <span class="number">1</span>]); |
| } |
| |
| <span class="attr">#[test] |
| #[should_panic(expected = <span class="string">"overflow"</span>)] |
| </span><span class="kw">fn </span>offsets_new_zeroed_overflow() { |
| OffsetBuffer::<i32>::new_zeroed(usize::MAX); |
| } |
| |
| <span class="attr">#[test] |
| #[should_panic(expected = <span class="string">"offsets must be monotonically increasing"</span>)] |
| </span><span class="kw">fn </span>non_monotonic_offsets() { |
| OffsetBuffer::new(<span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">0</span>].into()); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>from_lengths() { |
| <span class="kw">let </span>buffer = OffsetBuffer::<i32>::from_lengths([<span class="number">2</span>, <span class="number">6</span>, <span class="number">3</span>, <span class="number">7</span>, <span class="number">2</span>]); |
| <span class="macro">assert_eq!</span>(buffer.as_ref(), <span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">2</span>, <span class="number">8</span>, <span class="number">11</span>, <span class="number">18</span>, <span class="number">20</span>]); |
| |
| <span class="kw">let </span>half_max = i32::MAX / <span class="number">2</span>; |
| <span class="kw">let </span>buffer = OffsetBuffer::<i32>::from_lengths([half_max <span class="kw">as </span>usize, half_max <span class="kw">as </span>usize]); |
| <span class="macro">assert_eq!</span>(buffer.as_ref(), <span class="kw-2">&</span>[<span class="number">0</span>, half_max, half_max * <span class="number">2</span>]); |
| } |
| |
| <span class="attr">#[test] |
| #[should_panic(expected = <span class="string">"offset overflow"</span>)] |
| </span><span class="kw">fn </span>from_lengths_offset_overflow() { |
| OffsetBuffer::<i32>::from_lengths([i32::MAX <span class="kw">as </span>usize, <span class="number">1</span>]); |
| } |
| |
| <span class="attr">#[test] |
| #[should_panic(expected = <span class="string">"usize overflow"</span>)] |
| </span><span class="kw">fn </span>from_lengths_usize_overflow() { |
| OffsetBuffer::<i32>::from_lengths([usize::MAX, <span class="number">1</span>]); |
| } |
| } |
| </code></pre></div></section></main></body></html> |
