apache-arrow
Version:
Apache Arrow columnar in-memory format
1 lines • 26.4 kB
Source Map (JSON)
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Licensed to the Apache Software Foundation (ASF) under one\n// or more contributor license agreements. See the NOTICE file\n// distributed with this work for additional information\n// regarding copyright ownership. The ASF licenses this file\n// to you under the Apache License, Version 2.0 (the\n// \"License\"); you may not use this file except in compliance\n// with the License. You may obtain a copy of the License at\n//\n// http://www.apache.org/licenses/LICENSE-2.0\n//\n// Unless required by applicable law or agreed to in writing,\n// software distributed under the License is distributed on an\n// \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY\n// KIND, either express or implied. See the License for the\n// specific language governing permissions and limitations\n// under the License.\n\nimport { Vector } from '../vector';\nimport { StructVector } from './struct';\nimport { valueToString } from '../util/pretty';\nimport { DataType, Struct, RowLike } from '../type';\n\n/** @ignore */ const kParent = Symbol.for('parent');\n/** @ignore */ const kRowIndex = Symbol.for('rowIndex');\n/** @ignore */ const kKeyToIdx = Symbol.for('keyToIdx');\n/** @ignore */ const kIdxToVal = Symbol.for('idxToVal');\n/** @ignore */ const kCustomInspect = Symbol.for('nodejs.util.inspect.custom');\n\nabstract class Row<K extends PropertyKey = any, V = any> implements Map<K, V> {\n\n public readonly size: number;\n public readonly [Symbol.toStringTag]: string;\n\n protected [kRowIndex]: number;\n protected [kParent]: Vector<Struct>;\n protected [kKeyToIdx]: Map<K, number>;\n protected [kIdxToVal]: V[];\n\n constructor(parent: Vector<Struct>, numKeys: number) {\n this[kParent] = parent;\n this.size = numKeys;\n }\n\n public abstract keys(): IterableIterator<K>;\n public abstract values(): IterableIterator<V>;\n public abstract getKey(idx: number): K;\n public abstract getIndex(key: K): number;\n public abstract getValue(idx: number): V;\n public abstract setValue(idx: number, val: V): void;\n\n public entries() { return this[Symbol.iterator](); }\n\n public has(key: K) { return this.get(key) !== undefined; }\n\n public get(key: K) {\n let val = undefined;\n if (key !== null && key !== undefined) {\n const ktoi = this[kKeyToIdx] || (this[kKeyToIdx] = new Map());\n let idx = ktoi.get(key);\n if (idx !== undefined) {\n const itov = this[kIdxToVal] || (this[kIdxToVal] = new Array(this.size));\n ((val = itov[idx]) !== undefined) || (itov[idx] = val = this.getValue(idx));\n } else if ((idx = this.getIndex(key)) > -1) {\n ktoi.set(key, idx);\n const itov = this[kIdxToVal] || (this[kIdxToVal] = new Array(this.size));\n ((val = itov[idx]) !== undefined) || (itov[idx] = val = this.getValue(idx));\n }\n }\n return val;\n }\n\n public set(key: K, val: V) {\n if (key !== null && key !== undefined) {\n const ktoi = this[kKeyToIdx] || (this[kKeyToIdx] = new Map());\n let idx = ktoi.get(key);\n if (idx === undefined) {\n ktoi.set(key, idx = this.getIndex(key));\n }\n if (idx > -1) {\n const itov = this[kIdxToVal] || (this[kIdxToVal] = new Array(this.size));\n itov[idx] = <any> this.setValue(idx, val);\n }\n }\n return this;\n }\n\n public clear(): void { throw new Error(`Clearing ${this[Symbol.toStringTag]} not supported.`); }\n\n public delete(_: K): boolean { throw new Error(`Deleting ${this[Symbol.toStringTag]} values not supported.`); }\n\n public *[Symbol.iterator](): IterableIterator<[K, V]> {\n\n const ki = this.keys();\n const vi = this.values();\n const ktoi = this[kKeyToIdx] || (this[kKeyToIdx] = new Map());\n const itov = this[kIdxToVal] || (this[kIdxToVal] = new Array(this.size));\n\n for (let k: K, v: V, i = 0, kr: IteratorResult<K>, vr: IteratorResult<V>;\n !((kr = ki.next()).done || (vr = vi.next()).done);\n ++i\n ) {\n k = kr.value;\n v = vr.value;\n itov[i] = v;\n ktoi.has(k) || ktoi.set(k, i);\n yield [k, v];\n }\n }\n\n public forEach(callbackfn: (value: V, key: K, map: Map<K, V>) => void, thisArg?: any): void {\n\n const ki = this.keys();\n const vi = this.values();\n const callback = thisArg === undefined ? callbackfn :\n (v: V, k: K, m: Map<K, V>) => callbackfn.call(thisArg, v, k, m);\n const ktoi = this[kKeyToIdx] || (this[kKeyToIdx] = new Map());\n const itov = this[kIdxToVal] || (this[kIdxToVal] = new Array(this.size));\n\n for (let k: K, v: V, i = 0, kr: IteratorResult<K>, vr: IteratorResult<V>;\n !((kr = ki.next()).done || (vr = vi.next()).done);\n ++i\n ) {\n k = kr.value;\n v = vr.value;\n itov[i] = v;\n ktoi.has(k) || ktoi.set(k, i);\n callback(v, k, this);\n }\n }\n\n public toArray() { return [...this.values()]; }\n public toJSON() {\n const obj = {} as any;\n this.forEach((val, key) => obj[key] = val);\n return obj;\n }\n\n public inspect() { return this.toString(); }\n public [kCustomInspect]() { return this.toString(); }\n public toString() {\n const str: string[] = [];\n this.forEach((val, key) => {\n key = valueToString(key);\n val = valueToString(val);\n str.push(`${key}: ${val}`);\n });\n return `{ ${str.join(', ')} }`;\n }\n\n protected static [Symbol.toStringTag] = ((proto: Row) => {\n Object.defineProperties(proto, {\n 'size': { writable: true, enumerable: false, configurable: false, value: 0 },\n [kParent]: { writable: true, enumerable: false, configurable: false, value: null },\n [kRowIndex]: { writable: true, enumerable: false, configurable: false, value: -1 },\n });\n return (proto as any)[Symbol.toStringTag] = 'Row';\n })(Row.prototype);\n}\n\nexport class MapRow<K extends DataType = any, V extends DataType = any> extends Row<K['TValue'], V['TValue'] | null> {\n constructor(slice: Vector<Struct<{ key: K, value: V }>>) {\n super(slice, slice.length);\n return createRowProxy(this);\n }\n public keys() {\n return this[kParent].getChildAt(0)![Symbol.iterator]();\n }\n public values() {\n return this[kParent].getChildAt(1)![Symbol.iterator]();\n }\n public getKey(idx: number): K['TValue'] {\n return this[kParent].getChildAt(0)!.get(idx);\n }\n public getIndex(key: K['TValue']): number {\n return this[kParent].getChildAt(0)!.indexOf(key);\n }\n public getValue(index: number): V['TValue'] | null {\n return this[kParent].getChildAt(1)!.get(index);\n }\n public setValue(index: number, value: V['TValue'] | null): void {\n this[kParent].getChildAt(1)!.set(index, value);\n }\n}\n\nexport class StructRow<T extends { [key: string]: DataType } = any> extends Row<keyof T, T[keyof T]['TValue'] | null> {\n constructor(parent: StructVector<T>) {\n super(parent, parent.type.children.length);\n return defineRowProxyProperties(this);\n }\n public *keys() {\n for (const field of this[kParent].type.children) {\n yield field.name as keyof T;\n }\n }\n public *values() {\n for (const field of this[kParent].type.children) {\n yield (this as RowLike<T>)[field.name];\n }\n }\n public getKey(idx: number): keyof T {\n return this[kParent].type.children[idx].name as keyof T;\n }\n public getIndex(key: keyof T): number {\n return this[kParent].type.children.findIndex((f) => f.name === key);\n }\n public getValue(index: number): T[keyof T]['TValue'] | null {\n return this[kParent].getChildAt(index)!.get(this[kRowIndex]);\n }\n public setValue(index: number, value: T[keyof T]['TValue'] | null): void {\n return this[kParent].getChildAt(index)!.set(this[kRowIndex], value);\n }\n}\n\nObject.setPrototypeOf(Row.prototype, Map.prototype);\n\n/** @ignore */\nconst defineRowProxyProperties = (() => {\n const desc = { enumerable: true, configurable: false, get: null as any, set: null as any };\n return <T extends Row>(row: T) => {\n let idx = -1, ktoi = row[kKeyToIdx] || (row[kKeyToIdx] = new Map());\n const getter = (key: any) => function(this: T) { return this.get(key); };\n const setter = (key: any) => function(this: T, val: any) { return this.set(key, val); };\n for (const key of row.keys()) {\n ktoi.set(key, ++idx);\n desc.get = getter(key);\n desc.set = setter(key);\n row.hasOwnProperty(key) || (desc.enumerable = true, Object.defineProperty(row, key, desc));\n row.hasOwnProperty(idx) || (desc.enumerable = false, Object.defineProperty(row, idx, desc));\n }\n desc.get = desc.set = null;\n return row;\n };\n})();\n\n/** @ignore */\nconst createRowProxy = (() => {\n if (typeof Proxy === 'undefined') {\n return defineRowProxyProperties;\n }\n const has = Row.prototype.has;\n const get = Row.prototype.get;\n const set = Row.prototype.set;\n const getKey = Row.prototype.getKey;\n const RowProxyHandler: ProxyHandler<Row> = {\n isExtensible() { return false; },\n deleteProperty() { return false; },\n preventExtensions() { return true; },\n ownKeys(row: Row) { return [...row.keys()].map((x) => `${x}`); },\n has(row: Row, key: PropertyKey) {\n switch (key) {\n case 'getKey': case 'getIndex': case 'getValue': case 'setValue': case 'toArray': case 'toJSON': case 'inspect':\n case 'constructor': case 'isPrototypeOf': case 'propertyIsEnumerable': case 'toString': case 'toLocaleString': case 'valueOf':\n case 'size': case 'has': case 'get': case 'set': case 'clear': case 'delete': case 'keys': case 'values': case 'entries': case 'forEach':\n case '__proto__': case '__defineGetter__': case '__defineSetter__': case 'hasOwnProperty': case '__lookupGetter__': case '__lookupSetter__':\n case Symbol.iterator: case Symbol.toStringTag: case kParent: case kRowIndex: case kIdxToVal: case kKeyToIdx: case kCustomInspect:\n return true;\n }\n if (typeof key === 'number' && !row.has(key)) {\n key = row.getKey(key);\n }\n return row.has(key);\n },\n get(row: Row, key: PropertyKey, receiver: any) {\n switch (key) {\n case 'getKey': case 'getIndex': case 'getValue': case 'setValue': case 'toArray': case 'toJSON': case 'inspect':\n case 'constructor': case 'isPrototypeOf': case 'propertyIsEnumerable': case 'toString': case 'toLocaleString': case 'valueOf':\n case 'size': case 'has': case 'get': case 'set': case 'clear': case 'delete': case 'keys': case 'values': case 'entries': case 'forEach':\n case '__proto__': case '__defineGetter__': case '__defineSetter__': case 'hasOwnProperty': case '__lookupGetter__': case '__lookupSetter__':\n case Symbol.iterator: case Symbol.toStringTag: case kParent: case kRowIndex: case kIdxToVal: case kKeyToIdx: case kCustomInspect:\n return Reflect.get(row, key, receiver);\n }\n if (typeof key === 'number' && !has.call(receiver, key)) {\n key = getKey.call(receiver, key);\n }\n return get.call(receiver, key);\n },\n set(row: Row, key: PropertyKey, val: any, receiver: any) {\n switch (key) {\n case kParent: case kRowIndex: case kIdxToVal: case kKeyToIdx:\n return Reflect.set(row, key, val, receiver);\n case 'getKey': case 'getIndex': case 'getValue': case 'setValue': case 'toArray': case 'toJSON': case 'inspect':\n case 'constructor': case 'isPrototypeOf': case 'propertyIsEnumerable': case 'toString': case 'toLocaleString': case 'valueOf':\n case 'size': case 'has': case 'get': case 'set': case 'clear': case 'delete': case 'keys': case 'values': case 'entries': case 'forEach':\n case '__proto__': case '__defineGetter__': case '__defineSetter__': case 'hasOwnProperty': case '__lookupGetter__': case '__lookupSetter__':\n case Symbol.iterator: case Symbol.toStringTag:\n return false;\n }\n if (typeof key === 'number' && !has.call(receiver, key)) {\n key = getKey.call(receiver, key);\n }\n return has.call(receiver, key) ? !!set.call(receiver, key, val) : false;\n },\n };\n return <T extends Row>(row: T) => new Proxy(row, RowProxyHandler) as T;\n})();\n"]}