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// 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.
import { Data } from '../data.js';
import { DataType } from '../type.js';
/** @ignore */
export class ChunkedIterator<T extends DataType> implements IterableIterator<T['TValue'] | null> {
private chunkIndex = 0;
private chunkIterator: IterableIterator<T['TValue'] | null>;
constructor(
private numChunks: number = 0,
private getChunkIterator: (chunkIndex: number) => IterableIterator<T['TValue'] | null>
) {
this.chunkIterator = this.getChunkIterator(0);
}
next(): IteratorResult<T['TValue'] | null> {
while (this.chunkIndex < this.numChunks) {
const next = this.chunkIterator.next();
if (!next.done) {
return next;
}
if (++this.chunkIndex < this.numChunks) {
this.chunkIterator = this.getChunkIterator(this.chunkIndex);
}
}
return { done: true, value: null };
}
[Symbol.iterator]() {
return this;
}
}
/** @ignore */
export function computeChunkNullCounts<T extends DataType>(chunks: ReadonlyArray<Data<T>>) {
return chunks.reduce((nullCount, chunk) => nullCount + chunk.nullCount, 0);
}
/** @ignore */
export function computeChunkOffsets<T extends DataType>(chunks: ReadonlyArray<Data<T>>) {
return chunks.reduce((offsets, chunk, index) => {
offsets[index + 1] = offsets[index] + chunk.length;
return offsets;
}, new Uint32Array(chunks.length + 1));
}
/** @ignore */
export function sliceChunks<T extends DataType>(chunks: ReadonlyArray<Data<T>>, offsets: Uint32Array | Array<number>, begin: number, end: number) {
const slices: Data<T>[] = [];
for (let i = -1, n = chunks.length; ++i < n;) {
const chunk = chunks[i];
const offset = offsets[i];
const { length } = chunk;
// Stop if the child is to the right of the slice boundary
if (offset >= end) { break; }
// Exclude children to the left of of the slice boundary
if (begin >= offset + length) { continue; }
// Include entire child if between both left and right boundaries
if (offset >= begin && (offset + length) <= end) {
slices.push(chunk);
continue;
}
// Include the child slice that overlaps one of the slice boundaries
const from = Math.max(0, begin - offset);
const to = Math.min(end - offset, length);
slices.push(chunk.slice(from, to - from));
}
if (slices.length === 0) {
slices.push(chunks[0].slice(0, 0));
}
return slices;
}
/** @ignore */
export function binarySearch<
T extends DataType,
F extends (chunks: ReadonlyArray<Data<T>>, _1: number, _2: number) => any
>(chunks: ReadonlyArray<Data<T>>, offsets: Uint32Array | number[], idx: number, fn: F) {
let lhs = 0, mid = 0, rhs = offsets.length - 1;
do {
if (lhs >= rhs - 1) {
return (idx < offsets[rhs]) ? fn(chunks, lhs, idx - offsets[lhs]) : null;
}
mid = lhs + (Math.trunc((rhs - lhs) * .5));
idx < offsets[mid] ? (rhs = mid) : (lhs = mid);
} while (lhs < rhs);
}
/** @ignore */
export function isChunkedValid<T extends DataType>(data: Data<T>, index: number): boolean {
return data.getValid(index);
}
/** @ignore */
export function wrapChunkedCall1<T extends DataType>(fn: (c: Data<T>, _1: number) => any) {
function chunkedFn(chunks: ReadonlyArray<Data<T>>, i: number, j: number) { return fn(chunks[i], j); }
return function (this: any, index: number) {
const data = this.data as ReadonlyArray<Data<T>>;
return binarySearch(data, this._offsets, index, chunkedFn);
};
}
/** @ignore */
export function wrapChunkedCall2<T extends DataType>(fn: (c: Data<T>, _1: number, _2: any) => any) {
let _2: any;
function chunkedFn(chunks: ReadonlyArray<Data<T>>, i: number, j: number) { return fn(chunks[i], j, _2); }
return function (this: any, index: number, value: any) {
const data = this.data as ReadonlyArray<Data<T>>;
_2 = value;
const result = binarySearch(data, this._offsets, index, chunkedFn);
_2 = undefined;
return result;
};
}
/** @ignore */
export function wrapChunkedIndexOf<T extends DataType>(indexOf: (c: Data<T>, e: T['TValue'], o?: number) => any) {
let _1: any;
function chunkedIndexOf(data: ReadonlyArray<Data<T>>, chunkIndex: number, fromIndex: number) {
let begin = fromIndex, index = 0, total = 0;
for (let i = chunkIndex - 1, n = data.length; ++i < n;) {
const chunk = data[i];
if (~(index = indexOf(chunk, _1, begin))) {
return total + index;
}
begin = 0;
total += chunk.length;
}
return -1;
}
return function (this: any, element: T['TValue'], offset?: number) {
_1 = element;
const data = this.data as ReadonlyArray<Data<T>>;
const result = typeof offset !== 'number'
? chunkedIndexOf(data, 0, 0)
: binarySearch(data, this._offsets, offset, chunkedIndexOf);
_1 = undefined;
return result;
};
}
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