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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 { DataType } from '../type';\nimport { MessageHeader } from '../enum';\nimport { Footer } from './metadata/file';\nimport { Schema, Field } from '../schema';\nimport streamAdapters from '../io/adapters';\nimport { Message } from './metadata/message';\nimport * as metadata from './metadata/message';\nimport { ArrayBufferViewInput } from '../util/buffer';\nimport { ByteStream, AsyncByteStream } from '../io/stream';\nimport { RandomAccessFile, AsyncRandomAccessFile } from '../io/file';\nimport { VectorLoader, JSONVectorLoader } from '../visitor/vectorloader';\nimport { RecordBatch, _InternalEmptyPlaceholderRecordBatch } from '../recordbatch';\nimport {\n    FileHandle,\n    ArrowJSONLike,\n    ITERATOR_DONE,\n    ReadableInterop,\n} from '../io/interfaces';\nimport {\n    MessageReader, AsyncMessageReader, JSONMessageReader,\n    checkForMagicArrowString, magicLength, magicAndPadding, magicX2AndPadding\n} from './message';\nimport {\n    isPromise,\n    isIterable, isAsyncIterable,\n    isIteratorResult, isArrowJSON,\n    isFileHandle, isFetchResponse,\n    isReadableDOMStream, isReadableNodeStream\n} from '../util/compat';\n\n/** @ignore */ export type FromArg0 = ArrowJSONLike;\n/** @ignore */ export type FromArg1 = PromiseLike<ArrowJSONLike>;\n/** @ignore */ export type FromArg2 = Iterable<ArrayBufferViewInput> | ArrayBufferViewInput;\n/** @ignore */ export type FromArg3 = PromiseLike<Iterable<ArrayBufferViewInput> | ArrayBufferViewInput>;\n/** @ignore */ export type FromArg4 = Response | NodeJS.ReadableStream | ReadableStream<ArrayBufferViewInput> | AsyncIterable<ArrayBufferViewInput>;\n/** @ignore */ export type FromArg5 = FileHandle | PromiseLike<FileHandle> | PromiseLike<FromArg4>;\n/** @ignore */ export type FromArgs = FromArg0 | FromArg1 | FromArg2 | FromArg3 | FromArg4 | FromArg5;\n\n/** @ignore */ type OpenOptions = { autoDestroy?: boolean; };\n/** @ignore */ type RecordBatchReaders<T extends { [key: string]: DataType } = any> = RecordBatchFileReader<T> | RecordBatchStreamReader<T>;\n/** @ignore */ type AsyncRecordBatchReaders<T extends { [key: string]: DataType } = any> = AsyncRecordBatchFileReader<T> | AsyncRecordBatchStreamReader<T>;\n/** @ignore */ type RecordBatchFileReaders<T extends { [key: string]: DataType } = any> = RecordBatchFileReader<T> | AsyncRecordBatchFileReader<T>;\n/** @ignore */ type RecordBatchStreamReaders<T extends { [key: string]: DataType } = any> = RecordBatchStreamReader<T> | AsyncRecordBatchStreamReader<T>;\n\nexport class RecordBatchReader<T extends { [key: string]: DataType } = any> extends ReadableInterop<RecordBatch<T>> {\n\n    protected _impl: RecordBatchReaderImpls<T>;\n    protected constructor(impl: RecordBatchReaderImpls<T>) {\n        super();\n        this._impl = impl;\n    }\n\n    public get closed() { return this._impl.closed; }\n    public get schema() { return this._impl.schema; }\n    public get autoDestroy() { return this._impl.autoDestroy; }\n    public get dictionaries() { return this._impl.dictionaries; }\n    public get numDictionaries() { return this._impl.numDictionaries; }\n    public get numRecordBatches() { return this._impl.numRecordBatches; }\n    public get footer() { return this._impl.isFile() ? this._impl.footer : null; }\n\n    public isSync(): this is RecordBatchReaders<T> { return this._impl.isSync(); }\n    public isAsync(): this is AsyncRecordBatchReaders<T> { return this._impl.isAsync(); }\n    public isFile(): this is RecordBatchFileReaders<T> { return this._impl.isFile(); }\n    public isStream(): this is RecordBatchStreamReaders<T> { return this._impl.isStream(); }\n\n    public next() {\n        return this._impl.next();\n    }\n    public throw(value?: any) {\n        return this._impl.throw(value);\n    }\n    public return(value?: any) {\n        return this._impl.return(value);\n    }\n    public cancel() {\n        return this._impl.cancel();\n    }\n    public reset(schema?: Schema<T> | null): this {\n        this._impl.reset(schema);\n        this._DOMStream = undefined;\n        this._nodeStream = undefined;\n        return this;\n    }\n    public open(options?: OpenOptions) {\n        const opening = this._impl.open(options);\n        return isPromise(opening) ? 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{ [Symbol.iterator]: () => this } as Iterable<RecordBatch<T>>\n                : { [Symbol.asyncIterator]: () => this } as AsyncIterable<RecordBatch<T>>),\n            { objectMode: true });\n    }\n\n    /** @nocollapse */\n    // @ts-ignore\n    public static throughNode(options?: import('stream').DuplexOptions & { autoDestroy: boolean }): import('stream').Duplex {\n        throw new Error(`\"throughNode\" not available in this environment`);\n    }\n    /** @nocollapse */\n    public static throughDOM<T extends { [key: string]: DataType }>(\n        // @ts-ignore\n        writableStrategy?: ByteLengthQueuingStrategy,\n        // @ts-ignore\n        readableStrategy?: { autoDestroy: boolean }\n    ): { writable: WritableStream<Uint8Array>, readable: ReadableStream<RecordBatch<T>> } {\n        throw new Error(`\"throughDOM\" not available in this environment`);\n    }\n\n    public static from<T extends RecordBatchReader>(source: T): T;\n    public static from<T extends { [key: string]: DataType } = any>(source: FromArg0): RecordBatchStreamReader<T>;\n    public static from<T extends { [key: string]: DataType } = any>(source: FromArg1): Promise<RecordBatchStreamReader<T>>;\n    public static from<T extends { [key: string]: DataType } = any>(source: FromArg2): RecordBatchFileReader<T> | RecordBatchStreamReader<T>;\n    public static from<T extends { [key: string]: DataType } = any>(source: FromArg3): Promise<RecordBatchFileReader<T> | RecordBatchStreamReader<T>>;\n    public static from<T extends { [key: string]: DataType } = any>(source: FromArg4): Promise<RecordBatchFileReader<T> | AsyncRecordBatchReaders<T>>;\n    public static from<T extends { [key: string]: DataType } = any>(source: FromArg5): Promise<AsyncRecordBatchFileReader<T> | AsyncRecordBatchStreamReader<T>>;\n    /** @nocollapse */\n    public static from<T extends { [key: string]: DataType } = any>(source: any) {\n        if (source instanceof RecordBatchReader) {\n            return source;\n        } else if (isArrowJSON(source)) {\n            return fromArrowJSON<T>(source);\n        } else if (isFileHandle(source)) {\n            return fromFileHandle<T>(source);\n        } else if (isPromise<any>(source)) {\n            return (async () => await RecordBatchReader.from<any>(await source))();\n        } else if (isFetchResponse(source) || isReadableDOMStream(source) || isReadableNodeStream(source) || isAsyncIterable(source)) {\n            return fromAsyncByteStream<T>(new AsyncByteStream(source));\n        }\n        return fromByteStream<T>(new ByteStream(source));\n    }\n\n    public static readAll<T extends RecordBatchReader>(source: T): T extends RecordBatchReaders ? IterableIterator<T> : AsyncIterableIterator<T>;\n    public static readAll<T extends { [key: string]: DataType } = any>(source: FromArg0): IterableIterator<RecordBatchStreamReader<T>>;\n    public static readAll<T extends { [key: string]: DataType } = any>(source: FromArg1): AsyncIterableIterator<RecordBatchStreamReader<T>>;\n    public static readAll<T extends { [key: string]: DataType } = any>(source: FromArg2): IterableIterator<RecordBatchFileReader<T> | RecordBatchStreamReader<T>>;\n    public static readAll<T extends { [key: string]: DataType } = any>(source: FromArg3): AsyncIterableIterator<RecordBatchFileReader<T> | RecordBatchStreamReader<T>>;\n    public static readAll<T extends { [key: string]: DataType } = any>(source: FromArg4): AsyncIterableIterator<RecordBatchFileReader<T> | AsyncRecordBatchReaders<T>>;\n    public static readAll<T extends { [key: string]: DataType } = any>(source: FromArg5): AsyncIterableIterator<AsyncRecordBatchFileReader<T> | AsyncRecordBatchStreamReader<T>>;\n    /** @nocollapse */\n    public static readAll<T extends { [key: string]: DataType } = any>(source: any) {\n        if (source instanceof RecordBatchReader) {\n            return source.isSync() ? readAllSync(source) : readAllAsync(source as AsyncRecordBatchReaders<T>);\n        } else if (isArrowJSON(source) || ArrayBuffer.isView(source) || isIterable<ArrayBufferViewInput>(source) || isIteratorResult(source)) {\n            return readAllSync<T>(source) as IterableIterator<RecordBatchReaders<T>>;\n        }\n        return readAllAsync<T>(source) as AsyncIterableIterator<RecordBatchReaders<T> | AsyncRecordBatchReaders<T>>;\n    }\n}\n\n//\n// Since TS is a structural type system, we define the following subclass stubs\n// so that concrete types exist to associate with with the interfaces below.\n//\n// The implementation for each RecordBatchReader is hidden away in the set of\n// `RecordBatchReaderImpl` classes in the second half of this file. This allows\n// us to export a single RecordBatchReader class, and swap out the impl based\n// on the io primitives or underlying arrow (JSON, file, or stream) at runtime.\n//\n// Async/await makes our job a bit harder, since it forces everything to be\n// either fully sync or fully async. This is why the logic for the reader impls\n// has been duplicated into both sync and async variants. Since the RBR\n// delegates to its impl, an RBR with an AsyncRecordBatchFileReaderImpl for\n// example will return async/await-friendly Promises, but one with a (sync)\n// RecordBatchStreamReaderImpl will always return values. Nothing should be\n// different about their logic, aside from the async handling. This is also why\n// this code looks highly structured, as it should be nearly identical and easy\n// to follow.\n//\n\n/** @ignore */\nexport class RecordBatchStreamReader<T extends { [key: string]: DataType } = any> extends RecordBatchReader<T> {\n    constructor(protected _impl: RecordBatchStreamReaderImpl<T>) { super (_impl); }\n    public [Symbol.iterator]() { return (this._impl as IterableIterator<RecordBatch<T>>)[Symbol.iterator](); }\n    public async *[Symbol.asyncIterator](): AsyncIterableIterator<RecordBatch<T>> { yield* this[Symbol.iterator](); }\n}\n/** @ignore */\nexport class AsyncRecordBatchStreamReader<T extends { [key: string]: DataType } = any> extends RecordBatchReader<T> {\n    constructor(protected _impl: AsyncRecordBatchStreamReaderImpl<T>) { super (_impl); }\n    public [Symbol.iterator](): IterableIterator<RecordBatch<T>> { throw new Error(`AsyncRecordBatchStreamReader is not Iterable`); }\n    public [Symbol.asyncIterator]() { return (this._impl as AsyncIterableIterator<RecordBatch<T>>)[Symbol.asyncIterator](); }\n}\n/** @ignore */\nexport class RecordBatchFileReader<T extends { [key: string]: DataType } = any> extends RecordBatchStreamReader<T> {\n    constructor(protected _impl: RecordBatchFileReaderImpl<T>) { super (_impl); }\n}\n/** @ignore */\nexport class AsyncRecordBatchFileReader<T extends { [key: string]: DataType } = any> extends AsyncRecordBatchStreamReader<T> {\n    constructor(protected _impl: AsyncRecordBatchFileReaderImpl<T>) { super (_impl); }\n}\n\n//\n// Now override the return types for each sync/async RecordBatchReader variant\n//\n\n/** @ignore */\nexport interface RecordBatchStreamReader<T extends { [key: string]: DataType } = any> extends RecordBatchReader<T> {\n    open(options?: OpenOptions | undefined): this;\n    cancel(): void;\n    throw(value?: any): IteratorResult<any>;\n    return(value?: any): IteratorResult<any>;\n    next(value?: any): IteratorResult<RecordBatch<T>>;\n}\n\n/** @ignore */\nexport interface AsyncRecordBatchStreamReader<T extends { [key: string]: DataType } = any> extends RecordBatchReader<T> {\n    open(options?: OpenOptions | undefined): Promise<this>;\n    cancel(): Promise<void>;\n    throw(value?: any): Promise<IteratorResult<any>>;\n    return(value?: any): Promise<IteratorResult<any>>;\n    next(value?: any): Promise<IteratorResult<RecordBatch<T>>>;\n}\n\n/** @ignore */\nexport interface RecordBatchFileReader<T extends { [key: string]: DataType } = any> extends RecordBatchStreamReader<T> {\n    footer: Footer;\n    readRecordBatch(index: number): RecordBatch<T> | null;\n}\n\n/** @ignore */\nexport interface AsyncRecordBatchFileReader<T extends { [key: string]: DataType } = any> extends AsyncRecordBatchStreamReader<T> {\n    footer: Footer;\n    readRecordBatch(index: number): Promise<RecordBatch<T> | null>;\n}\n\n/** @ignore */\ntype RecordBatchReaderImpls<T extends { [key: string]: DataType } = any> =\n     RecordBatchJSONReaderImpl<T> |\n     RecordBatchFileReaderImpl<T> |\n     RecordBatchStreamReaderImpl<T> |\n     AsyncRecordBatchFileReaderImpl<T> |\n     AsyncRecordBatchStreamReaderImpl<T>;\n\n/** @ignore */\ninterface RecordBatchReaderImpl<T extends { [key: string]: DataType } = any> {\n\n    closed: boolean;\n    schema: Schema<T>;\n    autoDestroy: boolean;\n    dictionaries: Map<number, Vector>;\n\n    isFile(): this is RecordBatchFileReaders<T>;\n    isStream(): this is RecordBatchStreamReaders<T>;\n    isSync(): this is RecordBatchReaders<T>;\n    isAsync(): this is AsyncRecordBatchReaders<T>;\n\n    reset(schema?: Schema<T> | null): this;\n}\n\n/** @ignore */\ninterface RecordBatchStreamReaderImpl<T extends { [key: string]: DataType } = any> extends RecordBatchReaderImpl<T> {\n\n    open(options?: OpenOptions): this;\n    cancel(): void;\n\n    throw(value?: any): IteratorResult<any>;\n    return(value?: any): IteratorResult<any>;\n    next(value?: any): IteratorResult<RecordBatch<T>>;\n\n    [Symbol.iterator](): IterableIterator<RecordBatch<T>>;\n}\n\n/** @ignore */\ninterface AsyncRecordBatchStreamReaderImpl<T extends { [key: string]: DataType } = any> extends RecordBatchReaderImpl<T> {\n\n    open(options?: OpenOptions): Promise<this>;\n    cancel(): Promise<void>;\n\n    throw(value?: any): Promise<IteratorResult<any>>;\n    return(value?: any): Promise<IteratorResult<any>>;\n    next(value?: any): Promise<IteratorResult<RecordBatch<T>>>;\n\n    [Symbol.asyncIterator](): AsyncIterableIterator<RecordBatch<T>>;\n}\n\n/** @ignore */\ninterface RecordBatchFileReaderImpl<T extends { [key: string]: DataType } = any> extends RecordBatchStreamReaderImpl<T> {\n    readRecordBatch(index: number): RecordBatch<T> | null;\n}\n\n/** @ignore */\ninterface AsyncRecordBatchFileReaderImpl<T extends { [key: string]: DataType } = any> extends AsyncRecordBatchStreamReaderImpl<T> {\n    readRecordBatch(index: number): Promise<RecordBatch<T> | null>;\n}\n\n/** @ignore */\nabstract class RecordBatchReaderImpl<T extends { [key: string]: DataType } = any> implements RecordBatchReaderImpl<T> {\n\n    // @ts-ignore\n    public schema: Schema;\n    public closed = false;\n    public autoDestroy = true;\n    public dictionaries: Map<number, Vector>;\n\n    protected _dictionaryIndex = 0;\n    protected _recordBatchIndex = 0;\n    public get numDictionaries() { return this._dictionaryIndex; }\n    public get numRecordBatches() { return this._recordBatchIndex; }\n\n    constructor(dictionaries = new Map<number, Vector>()) {\n        this.dictionaries = dictionaries;\n    }\n\n    public isSync(): this is RecordBatchReaders<T> { return false; }\n    public isAsync(): this is AsyncRecordBatchReaders<T> { return false; }\n    public isFile(): this is RecordBatchFileReaders<T> { return false; }\n    public isStream(): this is RecordBatchStreamReaders<T> { return false; }\n\n    public reset(schema?: Schema<T> | null) {\n        this._dictionaryIndex = 0;\n        this._recordBatchIndex = 0;\n        this.schema = <any> schema;\n        this.dictionaries = new Map();\n        return this;\n    }\n\n    protected _loadRecordBatch(header: metadata.RecordBatch, body: any) {\n        return new RecordBatch<T>(this.schema, header.length, this._loadVectors(header, body, this.schema.fields));\n    }\n    protected _loadDictionaryBatch(header: metadata.DictionaryBatch, body: any) {\n        const { id, isDelta, data } = header;\n        const { dictionaries, schema } = this;\n        const dictionary = dictionaries.get(id);\n        if (isDelta || !dictionary) {\n            const type = schema.dictionaries.get(id)!;\n            return (dictionary && isDelta ? dictionary.concat(\n                Vector.new(this._loadVectors(data, body, [type])[0])) :\n                Vector.new(this._loadVectors(data, body, [type])[0])) as Vector;\n        }\n        return dictionary;\n    }\n    protected _loadVectors(header: metadata.RecordBatch, body: any, types: (Field | DataType)[]) {\n        return new VectorLoader(body, header.nodes, header.buffers, this.dictionaries).visitMany(types);\n    }\n}\n\n/** @ignore */\nclass RecordBatchStreamReaderImpl<T extends { [key: string]: DataType } = any> extends RecordBatchReaderImpl<T> implements IterableIterator<RecordBatch<T>> {\n\n    protected _reader: MessageReader;\n    protected _handle: ByteStream | ArrowJSONLike;\n\n    constructor(source: ByteStream | ArrowJSONLike, dictionaries?: Map<number, Vector>) {\n        super(dictionaries);\n        this._reader = !isArrowJSON(source)\n            ? new MessageReader(this._handle = source)\n            : new JSONMessageReader(this._handle = source);\n    }\n\n    public isSync(): this is RecordBatchReaders<T> { return true; }\n    public isStream(): this is RecordBatchStreamReaders<T> { return true; }\n    public [Symbol.iterator](): IterableIterator<RecordBatch<T>> {\n        return this as IterableIterator<RecordBatch<T>>;\n    }\n    public cancel() {\n        if (!this.closed && (this.closed = true)) {\n            this.reset()._reader.return();\n            this._reader = <any> null;\n            this.dictionaries = <any> null;\n        }\n    }\n    public open(options?: OpenOptions) {\n        if (!this.closed) {\n            this.autoDestroy = shouldAutoDestroy(this, options);\n            if (!(this.schema || (this.schema = this._reader.readSchema()!))) {\n                this.cancel();\n            }\n        }\n        return this;\n    }\n    public throw(value?: any): IteratorResult<any> {\n        if (!this.closed && this.autoDestroy && (this.closed = true)) {\n            return this.reset()._reader.throw(value);\n        }\n        return ITERATOR_DONE;\n    }\n    public return(value?: any): IteratorResult<any> {\n        if (!this.closed && this.autoDestroy && (this.closed = true)) {\n            return this.reset()._reader.return(value);\n        }\n        return ITERATOR_DONE;\n    }\n    public next(): IteratorResult<RecordBatch<T>> {\n        if (this.closed) { return ITERATOR_DONE; }\n        let message: Message | null, { _reader: reader } = this;\n        while (message = this._readNextMessageAndValidate()) {\n            if (message.isSchema()) {\n                this.reset(message.header());\n            } else if (message.isRecordBatch()) {\n                this._recordBatchIndex++;\n                const header = message.header();\n                const buffer = reader.readMessageBody(message.bodyLength);\n                const recordBatch = this._loadRecordBatch(header, buffer);\n                return { done: false, value: recordBatch };\n            } else if (message.isDictionaryBatch()) {\n                this._dictionaryIndex++;\n                const header = message.header();\n                const buffer = reader.readMessageBody(message.bodyLength);\n                const vector = this._loadDictionaryBatch(header, buffer);\n                this.dictionaries.set(header.id, vector);\n            }\n        }\n        if (this.schema && this._recordBatchIndex === 0) {\n            this._recordBatchIndex++;\n            return { done: false, value: new _InternalEmptyPlaceholderRecordBatch<T>(this.schema) };\n        }\n        return this.return();\n    }\n    protected _readNextMessageAndValidate<T extends MessageHeader>(type?: T | null) {\n        return this._reader.readMessage<T>(type);\n    }\n}\n\n/** @ignore */\nclass AsyncRecordBatchStreamReaderImpl<T extends { [key: string]: DataType } = any> extends RecordBatchReaderImpl<T> implements AsyncIterableIterator<RecordBatch<T>> {\n\n    protected _handle: AsyncByteStream;\n    protected _reader: AsyncMessageReader;\n\n    constructor(source: AsyncByteStream, dictionaries?: Map<number, Vector>) {\n        super(dictionaries);\n        this._reader = new AsyncMessageReader(this._handle = source);\n    }\n    public isAsync(): this is AsyncRecordBatchReaders<T> { return true; }\n    public isStream(): this is RecordBatchStreamReaders<T> { return true; }\n    public [Symbol.asyncIterator](): AsyncIterableIterator<RecordBatch<T>> {\n        return this as AsyncIterableIterator<RecordBatch<T>>;\n    }\n    public async cancel() {\n        if (!this.closed && (this.closed = true)) {\n            await this.reset()._reader.return();\n            this._reader = <any> null;\n            this.dictionaries = <any> null;\n        }\n    }\n    public async open(options?: OpenOptions) {\n        if (!this.closed) {\n            this.autoDestroy = shouldAutoDestroy(this, options);\n            if (!(this.schema || (this.schema = (await this._reader.readSchema())!))) {\n                await this.cancel();\n            }\n        }\n        return this;\n    }\n    public async throw(value?: any): Promise<IteratorResult<any>> {\n        if (!this.closed && this.autoDestroy && (this.closed = true)) {\n            return await this.reset()._reader.throw(value);\n        }\n        return ITERATOR_DONE;\n    }\n    public async return(value?: any): Promise<IteratorResult<any>> {\n        if (!this.closed && this.autoDestroy && (this.closed = true)) {\n            return await this.reset()._reader.return(value);\n        }\n        return ITERATOR_DONE;\n    }\n    public async next() {\n        if (this.closed) { return ITERATOR_DONE; }\n        let message: Message | null, { _reader: reader } = this;\n        while (message = await this._readNextMessageAndValidate()) {\n            if (message.isSchema()) {\n                await this.reset(message.header());\n            } else if (message.isRecordBatch()) {\n                this._recordBatchIndex++;\n                const header = message.header();\n                const buffer = await reader.readMessageBody(message.bodyLength);\n                const recordBatch = this._loadRecordBatch(header, buffer);\n                return { done: false, value: recordBatch };\n            } else if (message.isDictionaryBatch()) {\n                this._dictionaryIndex++;\n                const header = message.header();\n                const buffer = await reader.readMessageBody(message.bodyLength);\n                const vector = this._loadDictionaryBatch(header, buffer);\n                this.dictionaries.set(header.id, vector);\n            }\n        }\n        if (this.schema && this._recordBatchIndex === 0) {\n            this._recordBatchIndex++;\n            return { done: false, value: new _InternalEmptyPlaceholderRecordBatch<T>(this.schema) };\n        }\n        return await this.return();\n    }\n    protected async _readNextMessageAndValidate<T extends MessageHeader>(type?: T | null) {\n        return await this._reader.readMessage<T>(type);\n    }\n}\n\n/** @ignore */\nclass RecordBatchFileReaderImpl<T extends { [key: string]: DataType } = any> extends RecordBatchStreamReaderImpl<T> {\n\n    // @ts-ignore\n    protected _footer?: Footer;\n    // @ts-ignore\n    protected _handle: RandomAccessFile;\n    public get footer() { return this._footer!; }\n    public get numDictionaries() { return this._footer ? this._footer.numDictionaries : 0; }\n    public get numRecordBatches() { return this._footer ? this._footer.numRecordBatches : 0; }\n\n    constructor(source: RandomAccessFile | ArrayBufferViewInput, dictionaries?: Map<number, Vector>) {\n        super(source instanceof RandomAccessFile ? source : new RandomAccessFile(source), dictionaries);\n    }\n    public isSync(): this is RecordBatchReaders<T> { return true; }\n    public isFile(): this is RecordBatchFileReaders<T> { return true; }\n    public open(options?: OpenOptions) {\n        if (!this.closed && !this._footer) {\n            this.schema = (this._footer = this._readFooter()).schema;\n            for (const block of this._footer.dictionaryBatches()) {\n                block && this._readDictionaryBatch(this._dictionaryIndex++);\n            }\n        }\n        return super.open(options);\n    }\n    public readRecordBatch(index: number) {\n        if (this.closed) { return null; }\n        if (!this._footer) { this.open(); }\n        const block = this._footer && this._footer.getRecordBatch(index);\n        if (block && this._handle.seek(block.offset)) {\n            const message = this._reader.readMessage(MessageHeader.RecordBatch);\n            if (message && message.isRecordBatch()) {\n                const header = message.header();\n                const buffer = this._reader.readMessageBody(message.bodyLength);\n                const recordBatch = this._loadRecordBatch(header, buffer);\n                return recordBatch;\n            }\n        }\n        return null;\n    }\n    protected _readDictionaryBatch(index: number) {\n        const block = this._footer && this._footer.getDictionaryBatch(index);\n        if (block && this._handle.seek(block.offset)) {\n            const message = this._reader.readMessage(MessageHeader.DictionaryBatch);\n            if (message && message.isDictionaryBatch()) {\n                const header = message.header();\n                const buffer = this._reader.readMessageBody(message.bodyLength);\n                const vector = this._loadDictionaryBatch(header, buffer);\n                this.dictionaries.set(header.id, vector);\n            }\n        }\n    }\n    protected _readFooter() {\n        const { _handle } = this;\n        const offset = _handle.size - magicAndPadding;\n        const length = _handle.readInt32(offset);\n        const buffer = _handle.readAt(offset - length, length);\n        return Footer.decode(buffer);\n    }\n    protected _readNextMessageAndValidate<T extends MessageHeader>(type?: T | null): Message<T> | null {\n        if (!this._footer) { this.open(); }\n        if (this._footer && this._recordBatchIndex < this.numRecordBatches) {\n            const block = this._footer && this._footer.getRecordBatch(this._recordBatchIndex);\n            if (block && this._handle.seek(block.offset)) {\n                return this._reader.readMessage(type);\n            }\n        }\n        return null;\n    }\n}\n\n/** @ignore */\nclass AsyncRecordBatchFileReaderImpl<T extends { [key: string]: DataType } = any> extends AsyncRecordBatchStreamReaderImpl<T>\n    implements AsyncRecordBatchFileReaderImpl<T> {\n\n    protected _footer?: Footer;\n    // @ts-ignore\n    protected _handle: AsyncRandomAccessFile;\n    public get footer() { return this._footer!; }\n    public get numDictionaries() { return this._footer ? this._footer.numDictionaries : 0; }\n    public get numRecordBatches() { return this._footer ? this._footer.numRecordBatches : 0; }\n\n    constructor(source: FileHandle, byteLength?: number, dictionaries?: Map<number, Vector>);\n    constructor(source: FileHandle | AsyncRandomAccessFile, dictionaries?: Map<number, Vector>);\n    constructor(source: FileHandle | AsyncRandomAccessFile, ...rest: any[]) {\n        const byteLength = typeof rest[0] !== 'number' ? <number> rest.shift() : undefined;\n        const dictionaries = rest[0] instanceof Map ? <Map<number, Vector>> rest.shift() : undefined;\n        super(source instanceof AsyncRandomAccessFile ? source : new AsyncRandomAccessFile(source, byteLength), dictionaries);\n    }\n    public isFile(): this is RecordBatchFileReaders<T> { return true; }\n    public isAsync(): this is AsyncRecordBatchReaders<T> { return true; }\n    public async open(options?: OpenOptions) {\n        if (!this.closed && !this._footer) {\n            this.schema = (this._footer = await this._readFooter()).schema;\n            for (const block of this._footer.dictionaryBatches()) {\n                block && await this._readDictionaryBatch(this._dictionaryIndex++);\n            }\n        }\n        return await super.open(options);\n    }\n    public async readRecordBatch(index: number) {\n        if (this.closed) { return null; }\n        if (!this._footer) { await this.open(); }\n        const block = this._footer && this._footer.getRecordBatch(index);\n        if (block && (await this._handle.seek(block.offset))) {\n            const message = await this._reader.readMessage(MessageHeader.RecordBatch);\n            if (message && message.isRecordBatch()) {\n                const header = message.header();\n                const buffer = await this._reader.readMessageBody(message.bodyLength);\n                const recordBatch = this._loadRecordBatch(header, buffer);\n                return recordBatch;\n            }\n        }\n        return null;\n    }\n    protected async _readDictionaryBatch(index: number) {\n        const block = this._footer && this._footer.getDictionaryBatch(index);\n        if (block && (await this._handle.seek(block.offset))) {\n            const message = await this._reader.readMessage(MessageHeader.DictionaryBatch);\n            if (message && message.isDictionaryBatch()) {\n                const header = message.header();\n                const buffer = await this._reader.readMessageBody(message.bodyLength);\n                const vector = this._loadDictionaryBatch(header, buffer);\n                this.dictionaries.set(header.id, vector);\n            }\n        }\n    }\n    protected async _readFooter() {\n        const { _handle } = this;\n        _handle._pending && await _handle._pending;\n        const offset = _handle.size - magicAndPadding;\n        const length = await _handle.readInt32(offset);\n        const buffer = await _handle.readAt(offset - length, length);\n        return Footer.decode(buffer);\n    }\n    protected async _readNextMessageAndValidate<T extends MessageHeader>(type?: T | null): Promise<Message<T> | null> {\n        if (!this._footer) { await this.open(); }\n        if (this._footer && this._recordBatchIndex < this.numRecordBatches) {\n            const block = this._footer.getRecordBatch(this._recordBatchIndex);\n            if (block && await this._handle.seek(block.offset)) {\n                return await this._reader.readMessage(type);\n            }\n        }\n        return null;\n    }\n}\n\n/** @ignore */\nclass RecordBatchJSONReaderImpl<T extends { [key: string]: DataType } = any> extends RecordBatchStreamReaderImpl<T> {\n    constructor(source: ArrowJSONLike, dictionaries?: Map<number, Vector>) {\n        super(source, dictionaries);\n    }\n    protected _loadVectors(header: metadata.RecordBatch, body: any, types: (Field | DataType)[]) {\n        return new JSONVectorLoader(body, header.nodes, header.buffers, this.dictionaries).visitMany(types);\n    }\n}\n\n//\n// Define some helper functions and static implementations down here. There's\n// a bit of branching in the static methods that can lead to the same routines\n// being executed, so we've broken those out here for readability.\n//\n\n/** @ignore */\nfunction shouldAutoDestroy(self: { autoDestroy: boolean }, options?: OpenOptions) {\n    return options && (typeof options['autoDestroy'] === 'boolean') ? options['autoDestroy'] : self['autoDestroy'];\n}\n\n/** @ignore */\nfunction* readAllSync<T extends { [key: string]: DataType } = any>(source: RecordBatchReaders<T> | FromArg0 | FromArg2) {\n    const reader = RecordBatchReader.from<T>(<any> source) as RecordBatchReaders<T>;\n    try {\n        if (!reader.open({ autoDestroy: false }).closed) {\n            do { yield reader; } while (!(reader.reset().open()).closed);\n        }\n    } finally { reader.cancel(); }\n}\n\n/** @ignore */\nasync function* readAllAsync<T extends { [key: string]: DataType } = any>(source: AsyncRecordBatchReaders<T> | FromArg1 | FromArg3 | FromArg4 | FromArg5) {\n    const reader = await RecordBatchReader.from<T>(<any> source) as RecordBatchReader<T>;\n    try {\n        if (!(await reader.open({ autoDestroy: false })).closed) {\n            do { yield reader; } while (!(await reader.reset().open()).closed);\n        }\n    } finally { await reader.cancel(); }\n}\n\n/** @ignore */\nfunction fromArrowJSON<T extends { [key: string]: DataType }>(source: ArrowJSONLike) {\n    return new RecordBatchStreamReader(new RecordBatchJSONReaderImpl<T>(source));\n}\n\n/** @ignore */\nfunction fromByteStream<T extends { [key: string]: DataType }>(source: ByteStream) {\n    const bytes = source.peek((magicLength + 7) & ~7);\n    return bytes && bytes.byteLength >= 4 ? !checkForMagicArrowString(bytes)\n        ? new RecordBatchStreamReader(new RecordBatchStreamReaderImpl<T>(source))\n        : new RecordBatchFileReader(new RecordBatchFileReaderImpl<T>(source.read()))\n        : new RecordBatchStreamReader(new RecordBatchStreamReaderImpl<T>(function*(): any {}()));\n}\n\n/** @ignore */\nasync function fromAsyncByteStream<T extends { [key: string]: DataType }>(source: AsyncByteStream) {\n    const bytes = await source.peek((magicLength + 7) & ~7);\n    return bytes && bytes.byteLength >= 4 ? !checkForMagicArrowString(bytes)\n        ? new AsyncRecordBatchStreamReader(new AsyncRecordBatchStreamReaderImpl<T>(source))\n        : new RecordBatchFileReader(new RecordBatchFileReaderImpl<T>(await source.read()))\n        : new AsyncRecordBatchStreamReader(new AsyncRecordBatchStreamReaderImpl<T>(async function*(): any {}()));\n}\n\n/** @ignore */\nasync function fromFileHandle<T extends { [key: string]: DataType }>(source: FileHandle) {\n    const { size } = await source.stat();\n    const file = new AsyncRandomAccessFile(source, size);\n    if (size >= magicX2AndPadding) {\n        if (checkForMagicArrowString(await file.readAt(0, (magicLength + 7) & ~7))) {\n            return new AsyncRecordBatchFileReader(new AsyncRecordBatchFileReaderImpl<T>(file));\n        }\n    }\n    return new AsyncRecordBatchStreamReader(new AsyncRecordBatchStreamReaderImpl<T>(file));\n}\n"]}