apache-arrow/fb/decimal.js

Apache Arrow columnar in-memory format

"use strict";
// automatically generated by the FlatBuffers compiler, do not modify
Object.defineProperty(exports, "__esModule", { value: true });
exports.Decimal = void 0;
const flatbuffers = require("flatbuffers");
/**
 * Exact decimal value represented as an integer value in two's
 * complement. Currently only 128-bit (16-byte) and 256-bit (32-byte) integers
 * are used. The representation uses the endianness indicated
 * in the Schema.
 */
class Decimal {
    constructor() {
        this.bb = null;
        this.bb_pos = 0;
    }
    __init(i, bb) {
        this.bb_pos = i;
        this.bb = bb;
        return this;
    }
    static getRootAsDecimal(bb, obj) {
        return (obj || new Decimal()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
    }
    static getSizePrefixedRootAsDecimal(bb, obj) {
        bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
        return (obj || new Decimal()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
    }
    /**
     * Total number of decimal digits
     */
    precision() {
        const offset = this.bb.__offset(this.bb_pos, 4);
        return offset ? this.bb.readInt32(this.bb_pos + offset) : 0;
    }
    /**
     * Number of digits after the decimal point "."
     */
    scale() {
        const offset = this.bb.__offset(this.bb_pos, 6);
        return offset ? this.bb.readInt32(this.bb_pos + offset) : 0;
    }
    /**
     * Number of bits per value. The only accepted widths are 128 and 256.
     * We use bitWidth for consistency with Int::bitWidth.
     */
    bitWidth() {
        const offset = this.bb.__offset(this.bb_pos, 8);
        return offset ? this.bb.readInt32(this.bb_pos + offset) : 128;
    }
    static startDecimal(builder) {
        builder.startObject(3);
    }
    static addPrecision(builder, precision) {
        builder.addFieldInt32(0, precision, 0);
    }
    static addScale(builder, scale) {
        builder.addFieldInt32(1, scale, 0);
    }
    static addBitWidth(builder, bitWidth) {
        builder.addFieldInt32(2, bitWidth, 128);
    }
    static endDecimal(builder) {
        const offset = builder.endObject();
        return offset;
    }
    static createDecimal(builder, precision, scale, bitWidth) {
        Decimal.startDecimal(builder);
        Decimal.addPrecision(builder, precision);
        Decimal.addScale(builder, scale);
        Decimal.addBitWidth(builder, bitWidth);
        return Decimal.endDecimal(builder);
    }
}
exports.Decimal = Decimal;

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