@ombori/epc-ean/src/epc/grai/grai96.js

EPC Tag Data Standard encoding and decoding library, written in javascript

import Utils from '../utils/utils';
import { Epc } from '../epc';
import { Type } from '../type';
import { Partition } from '../partition';

export class Grai96 extends Epc {
  constructor(hexEpc) {
    super(Grai96.TOTAL_BITS);
    if (hexEpc) {
      super.setFromHexString(hexEpc);
    } else {
      super.set(Grai96.EPC_HEADER, Epc.EPC_HEADER_OFFSET, Epc.EPC_HEADER_END);
    }
  }

  clone() {
    return new Grai96().setFromBitArray(this);
  }

  getType() {
    return Type.GRAI96;
  }

  fromTagURI(uri) {
    const value = uri.split(':');
    try {
      if (value[3] === this.TAG_URI) {
        const data = value[4].split('.');
        const result = new Grai96();
        result.setFilter(parseInt(data[0]));
        result.setPartition(12 - data[1].length);
        result.setCompanyPrefix(parseInt(data[1]));
        result.setAssetType(parseInt(data[2]));
        result.setSerial(parseInt(data[3]));
        return result;
      }
    } catch (e) {
      // console.log(e)
    }
    throw new Error(`${uri} is not a known EPC tag URI scheme`);
  }

  toTagURI() {
    // F.C.I.S (Filter, Company, Asset Type, Serial)
    let partition = Grai96.PARTITIONS[this.getPartition()];
    return Grai96.TAG_URI_TEMPLATE(
      this.getFilter(),
      this.getSegmentString(partition.a),
      this.getSegmentString(partition.b),
      this.getSerial(),
    );
  }

  toIdURI() {
    // C.I.S (Company, Asset Type, Serial)
    let partition = Grai96.PARTITIONS[this.getPartition()];
    return Grai96.PID_URI_TEMPLATE(
      this.getSegmentString(partition.a),
      this.getSegmentString(partition.b),
      this.getSerial(),
    );
  }

  toBarcode() {
    return this.getGrai();
  }

  getTotalBits() {
    return Grai96.TOTAL_BITS;
  }

  getHeader() {
    return Grai96.EPC_HEADER;
  }

  getPartition() {
    return super.get(Grai96.PARTITION_OFFSET, Grai96.PARTITION_END);
  }

  setPartition(value) {
    if (value < 0 || value >= Grai96.PARTITIONS.length) {
      throw new Error(
        `Value '${value}' out of range (min: 0, max: ${Grai96.PARTITIONS.length - 1})`,
      );
    }
    super.set(value, Grai96.PARTITION_OFFSET, Grai96.PARTITION_END);
    return this;
  }

  getGrai() {
    let partition = Grai96.PARTITIONS[this.getPartition()];
    let companyPrefix = super.getSegmentString(partition.a);
    let assetType = super.getSegmentString(partition.b);
    let result = companyPrefix + assetType;
    return result + Utils.computeCheckDigit(result) + this.getSerial();
  }

  setGrai(grai) {
    let partition = Grai96.PARTITIONS[this.getPartition()];
    super.setSegment(grai.substring(0, partition.a.digits), partition.a);
    let tmp = partition.a.digits + partition.b.digits;
    super.setSegment(grai.substring(partition.a.digits, tmp), partition.b);
    this.setSerial(Number(grai.substring(tmp + 1, grai.length)));
    return this;
  }

  getCompanyPrefix() {
    return super.getSegment(Grai96.PARTITIONS[this.getPartition()].a);
  }

  setCompanyPrefix(value) {
    super.setSegment(value, Grai96.PARTITIONS[this.getPartition()].a);
    return this;
  }

  getAssetType() {
    return super.getSegment(Grai96.PARTITIONS[this.getPartition()].b);
  }

  setAssetType(value) {
    super.setSegment(value, Grai96.PARTITIONS[this.getPartition()].b);
    return this;
  }

  getSerial() {
    return super.get(Grai96.SERIAL_OFFSET, Grai96.SERIAL_END);
  }

  setSerial(value) {
    if (value > Grai96.MAX_SERIAL)
      throw new Error(
        `Value '${value}' out of range (min: 0, max: ${Grai96.MAX_SERIAL})`,
      );
    super.set(value, Grai96.SERIAL_OFFSET, Grai96.SERIAL_END);
    return this;
  }
}

Grai96.EPC_HEADER = 0x33;

Grai96.TOTAL_BITS = 96;
Grai96.PARTITION_OFFSET = 11;
Grai96.PARTITION_END = 14;
Grai96.SERIAL_OFFSET = 58;
Grai96.SERIAL_END = Grai96.TOTAL_BITS;
Grai96.SERIAL_BITS = 38;
Grai96.MAX_SERIAL = Utils.getMaxValue(Grai96.SERIAL_BITS); // 274877906943

Grai96.TAG_URI = 'grai-96';

Grai96.TAG_URI_TEMPLATE = (filter, company, asset, serial) => {
  return `urn:epc:tag:${this.TAG_URI}:${filter}.${company}.${asset}.${serial}`;
}; // F.C.A.S (Filter, Company, AssetType, Serial)
Grai96.PID_URI_TEMPLATE = (company, asset, serial) => {
  return `urn:epc:id:grai:${company}.${asset}.${serial}`;
}; // C.A.S   (Company, AssetType, Serial)

// Partition table columns: Company prefix, Asset Type
Grai96.PARTITIONS = [
  new Partition(Grai96.PARTITION_END, 40, 12, 4, 0), // 0 40 12 04 0
  new Partition(Grai96.PARTITION_END, 37, 11, 7, 1), // 1 37 11 07 1
  new Partition(Grai96.PARTITION_END, 34, 10, 10, 2), // 2 34 10 10 2
  new Partition(Grai96.PARTITION_END, 30, 9, 14, 3), // 3 30 09 14 3
  new Partition(Grai96.PARTITION_END, 27, 8, 17, 4), // 4 27 08 17 4
  new Partition(Grai96.PARTITION_END, 24, 7, 20, 5), // 5 24 07 20 5
  new Partition(Grai96.PARTITION_END, 20, 6, 24, 6),
]; // 6 20 06 24 6