@ombori/epc-ean/src/epc/gsrn/gsrn96.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 Gsrn96 extends Epc {
  constructor(hexEpc) {
    super(Gsrn96.TOTAL_BITS);
    if (hexEpc) {
      super.setFromHexString(hexEpc);
    } else {
      super.set(Gsrn96.EPC_HEADER, Epc.EPC_HEADER_OFFSET, Epc.EPC_HEADER_END);
    }
  }

  clone() {
    return new Gsrn96().setFromBitArray(this);
  }

  getType() {
    return Type.GSRN96;
  }

  fromTagURI(uri) {
    const value = uri.split(':');
    try {
      if (value[3] === this.TAG_URI) {
        const data = value[4].split('.');
        const result = new Gsrn96();
        result.setFilter(parseInt(data[0]));
        result.setPartition(12 - data[1].length);
        result.setCompanyPrefix(parseInt(data[1]));
        result.setServiceReference(parseInt(data[2]));
        return result;
      }
    } catch (e) {
      // console.log(e)
    }
    throw new Error(`${uri} is not a known EPC tag URI scheme`);
  }

  toTagURI() {
    // F.C.S (Filter, Company, Service)
    let partition = Gsrn96.PARTITIONS[this.getPartition()];
    return Gsrn96.TAG_URI_TEMPLATE(
      this.getFilter(),
      this.getSegmentString(partition.a),
      this.getSegment(partition.b),
    );
  }

  toIdURI() {
    // C.S (Company, Service))
    let partition = Gsrn96.PARTITIONS[this.getPartition()];
    return Gsrn96.PID_URI_TEMPLATE(
      this.getSegmentString(partition.a),
      this.getSegment(partition.b),
    );
  }

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

  getTotalBits() {
    return Gsrn96.TOTAL_BITS;
  }

  getHeader() {
    return Gsrn96.EPC_HEADER;
  }

  getPartition() {
    return super.get(Gsrn96.PARTITION_OFFSET, Gsrn96.PARTITION_END);
  }

  setPartition(value) {
    if (value < 0 || value >= Gsrn96.PARTITIONS.length) {
      throw new Error(
        `Value '${value}' out of range (min: 0, max: ${Gsrn96.PARTITIONS.length - 1})`,
      );
    }
    super.set(value, Gsrn96.PARTITION_OFFSET, Gsrn96.PARTITION_END);
    return this;
  }

  getGsrn() {
    let partition = Gsrn96.PARTITIONS[this.getPartition()];
    let companyPrefix = super.getSegmentString(partition.a);
    let service = super.getSegmentString(partition.b);
    let result = companyPrefix + service;
    return result + Utils.computeCheckDigit(result);
  }

  setGsrn(gsrn) {
    let partition = Gsrn96.PARTITIONS[this.getPartition()];
    super.setSegment(gsrn.substring(0, partition.a.digits), partition.a);
    let tmp = partition.a.digits + partition.b.digits;
    super.setSegment(gsrn.substring(partition.a.digits, tmp), partition.b);
    return this;
  }

  getCompanyPrefix() {
    return super.getSegment(Gsrn96.PARTITIONS[this.getPartition()].a);
  }

  setCompanyPrefix(value) {
    super.setSegment(value, Gsrn96.PARTITIONS[this.getPartition()].a);
    return this;
  }

  getServiceReference() {
    return super.getSegment(Gsrn96.PARTITIONS[this.getPartition()].b);
  }

  setServiceReference(value) {
    super.setSegment(value, Gsrn96.PARTITIONS[this.getPartition()].b);
    return this;
  }
}

Gsrn96.EPC_HEADER = 0x2d;

Gsrn96.TOTAL_BITS = 96;
Gsrn96.PARTITION_OFFSET = 11;
Gsrn96.PARTITION_END = 14;

Gsrn96.TAG_URI = 'gsrn-96';

Gsrn96.TAG_URI_TEMPLATE = (filter, company, service) => {
  return `urn:epc:tag:${this.TAG_URI}:${filter}.${company}.${service}`;
}; // F.C.S (Filter, Company, Service)
Gsrn96.PID_URI_TEMPLATE = (company, asset) => {
  return `urn:epc:id:gsrn:${company}.${asset}`;
}; // C.S (Company, Service)

// Partition table columns: Company prefix, Service Reference
Gsrn96.PARTITIONS = [
  new Partition(Gsrn96.PARTITION_END, 40, 12, 18, 5), // 0 40 12 18 5
  new Partition(Gsrn96.PARTITION_END, 37, 11, 21, 6), // 1 37 11 21 6
  new Partition(Gsrn96.PARTITION_END, 34, 10, 24, 7), // 2 34 10 24 7
  new Partition(Gsrn96.PARTITION_END, 30, 9, 28, 8), // 3 30 09 28 8
  new Partition(Gsrn96.PARTITION_END, 27, 8, 31, 9), // 4 27 08 31 9
  new Partition(Gsrn96.PARTITION_END, 24, 7, 34, 10), // 5 24 07 34 10
  new Partition(Gsrn96.PARTITION_END, 20, 6, 38, 11),
]; // 6 20 06 38 11