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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 { DataType } from '../../type';\nimport { Duplex, DuplexOptions } from 'stream';\nimport { AsyncByteStream } from '../../io/stream';\nimport { RecordBatchWriter } from '../../ipc/writer';\n\n/** @ignore */\nexport function recordBatchWriterThroughNodeStream<T extends { [key: string]: DataType } = any>(this: typeof RecordBatchWriter, options?: DuplexOptions & { autoDestroy: boolean }) {\n    return new RecordBatchWriterDuplex(new this<T>(options));\n}\n\n/** @ignore */\ntype CB = (error?: Error | null | undefined) => void;\n\n/** @ignore */\nclass RecordBatchWriterDuplex<T extends { [key: string]: DataType } = any> extends Duplex {\n    private _pulling: boolean = false;\n    private _reader: AsyncByteStream | null;\n    private _writer: RecordBatchWriter | null;\n    constructor(writer: RecordBatchWriter<T>, options?: DuplexOptions) {\n        super({ allowHalfOpen: false, ...options, writableObjectMode: true, readableObjectMode: false });\n        this._writer = writer;\n        this._reader = new AsyncByteStream(writer);\n    }\n    _final(cb?: CB) {\n        const writer = this._writer;\n        writer && writer.close();\n        cb && cb();\n    }\n    _write(x: any, _: string, cb: CB) {\n        const writer = this._writer;\n        writer && writer.write(x);\n        cb && cb();\n        return true;\n    }\n    _read(size: number) {\n        const it = this._reader;\n        if (it && !this._pulling && (this._pulling = true)) {\n            (async () => this._pulling = await this._pull(size, it))();\n        }\n    }\n    _destroy(err: Error | null, cb: (error: Error | null) => void) {\n        const writer = this._writer;\n        if (writer) { err ? writer.abort(err) : writer.close(); }\n        cb(this._reader = this._writer = null);\n    }\n    async _pull(size: number, reader: AsyncByteStream) {\n        let r: IteratorResult<Uint8Array> | null = null;\n        while (this.readable && !(r = await reader.next(size || null)).done) {\n            if (size != null && r.value) {\n                size -= r.value.byteLength;\n            }\n            if (!this.push(r.value) || size <= 0) { break; }\n        }\n        if ((r && r.done || !this.readable)) {\n            this.push(null);\n            await reader.cancel();\n        }\n        return !this.readable;\n    }\n}\n"]}