apache-arrow/visitor/vectorloader.mjs.map

Apache Arrow columnar in-memory format

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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 { Data } from '../data';\nimport * as type from '../type';\nimport { Field } from '../schema';\nimport { Vector } from '../vector';\nimport { DataType } from '../type';\nimport { Visitor } from '../visitor';\nimport { packBools } from '../util/bit';\nimport { encodeUtf8 } from '../util/utf8';\nimport { Int64, Int128 } from '../util/int';\nimport { UnionMode, DateUnit } from '../enum';\nimport { toArrayBufferView } from '../util/buffer';\nimport { BufferRegion, FieldNode } from '../ipc/metadata/message';\n\n/** @ignore */\nexport interface VectorLoader extends Visitor {\n    visit<T extends DataType>(node: Field<T> | T): Data<T>;\n    visitMany<T extends DataType>(nodes: (Field<T> | T)[]): Data<T>[];\n}\n\n/** @ignore */\nexport class VectorLoader extends Visitor {\n    private bytes: Uint8Array;\n    private nodes: FieldNode[];\n    private nodesIndex: number = -1;\n    private buffers: BufferRegion[];\n    private buffersIndex: number = -1;\n    private dictionaries: Map<number, Vector<any>>;\n    constructor(bytes: Uint8Array, nodes: FieldNode[], buffers: BufferRegion[], dictionaries: Map<number, Vector<any>>) {\n        super();\n        this.bytes = bytes;\n        this.nodes = nodes;\n        this.buffers = buffers;\n        this.dictionaries = dictionaries;\n    }\n\n    public visit<T extends DataType>(node: Field<T> | T): Data<T> {\n        return super.visit(node instanceof Field ? node.type : node);\n    }\n\n    public visitNull            <T extends type.Null>            (type: T, { length,           } = this.nextFieldNode()) { return            Data.Null(type, 0, length);                                                                                                                                 }\n    public visitBool            <T extends type.Bool>            (type: T, { length, nullCount } = this.nextFieldNode()) { return            Data.Bool(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type));                                                           }\n    public visitInt             <T extends type.Int>             (type: T, { length, nullCount } = this.nextFieldNode()) { return             Data.Int(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type));                                                           }\n    public visitFloat           <T extends type.Float>           (type: T, { length, nullCount } = this.nextFieldNode()) { return           Data.Float(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type));                                                           }\n    public visitUtf8            <T extends type.Utf8>            (type: T, { length, nullCount } = this.nextFieldNode()) { return            Data.Utf8(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readOffsets(type), this.readData(type));                                   }\n    public visitBinary          <T extends type.Binary>          (type: T, { length, nullCount } = this.nextFieldNode()) { return          Data.Binary(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readOffsets(type), this.readData(type));                                   }\n    public visitFixedSizeBinary <T extends type.FixedSizeBinary> (type: T, { length, nullCount } = this.nextFieldNode()) { return Data.FixedSizeBinary(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type));                                                           }\n    public visitDate            <T extends type.Date_>           (type: T, { length, nullCount } = this.nextFieldNode()) { return            Data.Date(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type));                                                           }\n    public visitTimestamp       <T extends type.Timestamp>       (type: T, { length, nullCount } = this.nextFieldNode()) { return       Data.Timestamp(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type));                                                           }\n    public visitTime            <T extends type.Time>            (type: T, { length, nullCount } = this.nextFieldNode()) { return            Data.Time(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type));                                                           }\n    public visitDecimal         <T extends type.Decimal>         (type: T, { length, nullCount } = this.nextFieldNode()) { return         Data.Decimal(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type));                                                           }\n    public visitList            <T extends type.List>            (type: T, { length, nullCount } = this.nextFieldNode()) { return            Data.List(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readOffsets(type), this.visit(type.children[0]));                          }\n    public visitStruct          <T extends type.Struct>          (type: T, { length, nullCount } = this.nextFieldNode()) { return          Data.Struct(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.visitMany(type.children));                                                 }\n    public visitUnion           <T extends type.Union>           (type: T                                              ) { return type.mode === UnionMode.Sparse ? this.visitSparseUnion(type as type.SparseUnion) : this.visitDenseUnion(type as type.DenseUnion);                                      }\n    public visitDenseUnion      <T extends type.DenseUnion>      (type: T, { length, nullCount } = this.nextFieldNode()) { return           Data.Union(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readTypeIds(type), this.readOffsets(type), this.visitMany(type.children)); }\n    public visitSparseUnion     <T extends type.SparseUnion>     (type: T, { length, nullCount } = this.nextFieldNode()) { return           Data.Union(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readTypeIds(type), this.visitMany(type.children));                         }\n    public visitDictionary      <T extends type.Dictionary>      (type: T, { length, nullCount } = this.nextFieldNode()) { return      Data.Dictionary(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type.indices), this.readDictionary(type));                        }\n    public visitInterval        <T extends type.Interval>        (type: T, { length, nullCount } = this.nextFieldNode()) { return        Data.Interval(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type));                                                           }\n    public visitFixedSizeList   <T extends type.FixedSizeList>   (type: T, { length, nullCount } = this.nextFieldNode()) { return   Data.FixedSizeList(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.visit(type.children[0]));                                                  }\n    public visitMap             <T extends type.Map_>            (type: T, { length, nullCount } = this.nextFieldNode()) { return             Data.Map(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readOffsets(type), this.visit(type.children[0]));                          }\n\n    protected nextFieldNode() { return this.nodes[++this.nodesIndex]; }\n    protected nextBufferRange() { return this.buffers[++this.buffersIndex]; }\n    protected readNullBitmap<T extends DataType>(type: T, nullCount: number, buffer = this.nextBufferRange()) {\n        return nullCount > 0 && this.readData(type, buffer) || new Uint8Array(0);\n    }\n    protected readOffsets<T extends DataType>(type: T, buffer?: BufferRegion) { return this.readData(type, buffer); }\n    protected readTypeIds<T extends DataType>(type: T, buffer?: BufferRegion) { return this.readData(type, buffer); }\n    protected readData<T extends DataType>(_type: T, { length, offset } = this.nextBufferRange()) {\n        return this.bytes.subarray(offset, offset + length);\n    }\n    protected readDictionary<T extends type.Dictionary>(type: T): Vector<T['dictionary']> {\n        return this.dictionaries.get(type.id)!;\n    }\n}\n\n/** @ignore */\nexport class JSONVectorLoader extends VectorLoader {\n    private sources: any[][];\n    constructor(sources: any[][], nodes: FieldNode[], buffers: BufferRegion[], dictionaries: Map<number, Vector<any>>) {\n        super(new Uint8Array(0), nodes, buffers, dictionaries);\n        this.sources = sources;\n    }\n    protected readNullBitmap<T extends DataType>(_type: T, nullCount: number, { offset } = this.nextBufferRange()) {\n        return nullCount <= 0 ? new Uint8Array(0) : packBools(this.sources[offset]);\n    }\n    protected readOffsets<T extends DataType>(_type: T, { offset } = this.nextBufferRange()) {\n        return toArrayBufferView(Uint8Array, toArrayBufferView(Int32Array, this.sources[offset]));\n    }\n    protected readTypeIds<T extends DataType>(type: T, { offset } = this.nextBufferRange()) {\n        return toArrayBufferView(Uint8Array, toArrayBufferView(type.ArrayType, this.sources[offset]));\n    }\n    protected readData<T extends DataType>(type: T, { offset } = this.nextBufferRange()) {\n        const { sources } = this;\n        if (DataType.isTimestamp(type)) {\n            return toArrayBufferView(Uint8Array, Int64.convertArray(sources[offset] as string[]));\n        } else if ((DataType.isInt(type) || DataType.isTime(type)) && type.bitWidth === 64) {\n            return toArrayBufferView(Uint8Array, Int64.convertArray(sources[offset] as string[]));\n        } else if (DataType.isDate(type) && type.unit === DateUnit.MILLISECOND) {\n            return toArrayBufferView(Uint8Array, Int64.convertArray(sources[offset] as string[]));\n        } else if (DataType.isDecimal(type)) {\n            return toArrayBufferView(Uint8Array, Int128.convertArray(sources[offset] as string[]));\n        } else if (DataType.isBinary(type) || DataType.isFixedSizeBinary(type)) {\n            return binaryDataFromJSON(sources[offset] as string[]);\n        } else if (DataType.isBool(type)) {\n            return packBools(sources[offset] as number[]);\n        } else if (DataType.isUtf8(type)) {\n            return encodeUtf8((sources[offset] as string[]).join(''));\n        }\n        return toArrayBufferView(Uint8Array, toArrayBufferView(type.ArrayType, sources[offset].map((x) => +x)));\n    }\n}\n\n/** @ignore */\nfunction binaryDataFromJSON(values: string[]) {\n    // \"DATA\": [\"49BC7D5B6C47D2\",\"3F5FB6D9322026\"]\n    // There are definitely more efficient ways to do this... but it gets the\n    // job done.\n    const joined = values.join('');\n    const data = new Uint8Array(joined.length / 2);\n    for (let i = 0; i < joined.length; i += 2) {\n        data[i >> 1] = parseInt(joined.substr(i, 2), 16);\n    }\n    return data;\n}\n"]}