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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\n/* tslint:disable:class-name */\n\nimport * as File_ from '../../fb/File';\nimport { flatbuffers } from 'flatbuffers';\n\nimport Long = flatbuffers.Long;\nimport Builder = flatbuffers.Builder;\nimport ByteBuffer = flatbuffers.ByteBuffer;\nimport _Block = File_.org.apache.arrow.flatbuf.Block;\nimport _Footer = File_.org.apache.arrow.flatbuf.Footer;\n\nimport { Schema } from '../../schema';\nimport { MetadataVersion } from '../../enum';\nimport { toUint8Array } from '../../util/buffer';\nimport { ArrayBufferViewInput } from '../../util/buffer';\n\n/** @ignore */\nclass Footer_ {\n\n /** @nocollapse */\n public static decode(buf: ArrayBufferViewInput) {\n buf = new ByteBuffer(toUint8Array(buf));\n const footer = _Footer.getRootAsFooter(buf);\n const schema = Schema.decode(footer.schema()!);\n return new OffHeapFooter(schema, footer) as Footer_;\n }\n\n /** @nocollapse */\n public static encode(footer: Footer_) {\n\n const b: Builder = new Builder();\n const schemaOffset = Schema.encode(b, footer.schema);\n\n _Footer.startRecordBatchesVector(b, footer.numRecordBatches);\n [...footer.recordBatches()].slice().reverse().forEach((rb) => FileBlock.encode(b, rb));\n const recordBatchesOffset = b.endVector();\n\n _Footer.startDictionariesVector(b, footer.numDictionaries);\n [...footer.dictionaryBatches()].slice().reverse().forEach((db) => FileBlock.encode(b, db));\n\n const dictionaryBatchesOffset = b.endVector();\n\n _Footer.startFooter(b);\n _Footer.addSchema(b, schemaOffset);\n _Footer.addVersion(b, MetadataVersion.V4);\n _Footer.addRecordBatches(b, recordBatchesOffset);\n _Footer.addDictionaries(b, dictionaryBatchesOffset);\n _Footer.finishFooterBuffer(b, _Footer.endFooter(b));\n\n return b.asUint8Array();\n }\n\n // @ts-ignore\n protected _recordBatches: FileBlock[];\n // @ts-ignore\n protected _dictionaryBatches: FileBlock[];\n public get numRecordBatches() { return this._recordBatches.length; }\n public get numDictionaries() { return this._dictionaryBatches.length; }\n\n constructor(public schema: Schema,\n public version: MetadataVersion = MetadataVersion.V4,\n recordBatches?: FileBlock[], dictionaryBatches?: FileBlock[]) {\n recordBatches && (this._recordBatches = recordBatches);\n dictionaryBatches && (this._dictionaryBatches = dictionaryBatches);\n }\n\n public *recordBatches(): Iterable<FileBlock> {\n for (let block, i = -1, n = this.numRecordBatches; ++i < n;) {\n if (block = this.getRecordBatch(i)) { yield block; }\n }\n }\n\n public *dictionaryBatches(): Iterable<FileBlock> {\n for (let block, i = -1, n = this.numDictionaries; ++i < n;) {\n if (block = this.getDictionaryBatch(i)) { yield block; }\n }\n }\n\n public getRecordBatch(index: number) {\n return index >= 0\n && index < this.numRecordBatches\n && this._recordBatches[index] || null;\n }\n\n public getDictionaryBatch(index: number) {\n return index >= 0\n && index < this.numDictionaries\n && this._dictionaryBatches[index] || null;\n }\n}\n\nexport { Footer_ as Footer };\n\n/** @ignore */\nclass OffHeapFooter extends Footer_ {\n\n public get numRecordBatches() { return this._footer.recordBatchesLength(); }\n public get numDictionaries() { return this._footer.dictionariesLength(); }\n\n constructor(schema: Schema, protected _footer: _Footer) {\n super(schema, _footer.version());\n }\n\n public getRecordBatch(index: number) {\n if (index >= 0 && index < this.numRecordBatches) {\n const fileBlock = this._footer.recordBatches(index);\n if (fileBlock) { return FileBlock.decode(fileBlock); }\n }\n return null;\n }\n\n public getDictionaryBatch(index: number) {\n if (index >= 0 && index < this.numDictionaries) {\n const fileBlock = this._footer.dictionaries(index);\n if (fileBlock) { return FileBlock.decode(fileBlock); }\n }\n return null;\n }\n}\n\n/** @ignore */\nexport class FileBlock {\n\n /** @nocollapse */\n public static decode(block: _Block) {\n return new FileBlock(block.metaDataLength(), block.bodyLength(), block.offset());\n }\n\n /** @nocollapse */\n public static encode(b: Builder, fileBlock: FileBlock) {\n const { metaDataLength } = fileBlock;\n const offset = new Long(fileBlock.offset, 0);\n const bodyLength = new Long(fileBlock.bodyLength, 0);\n return _Block.createBlock(b, offset, metaDataLength, bodyLength);\n }\n\n public offset: number;\n public bodyLength: number;\n public metaDataLength: number;\n\n constructor(metaDataLength: number, bodyLength: Long | number, offset: Long | number) {\n this.metaDataLength = metaDataLength;\n this.offset = typeof offset === 'number' ? offset : offset.low;\n this.bodyLength = typeof bodyLength === 'number' ? bodyLength : bodyLength.low;\n }\n}\n"]} |