@ombori/epc-ean/src/epc/sgtin/sgtin198.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 { Sgtin96 } from './sgtin96';

export class Sgtin198 extends Epc {
  constructor(hexEpc) {
    super(Sgtin198.TOTAL_BITS);
    if (hexEpc) {
      super.setFromHexString(hexEpc);
    } else {
      super.set(Sgtin198.EPC_HEADER, Epc.EPC_HEADER_OFFSET, Epc.EPC_HEADER_END);
    }
  }

  clone() {
    return new Sgtin198().setFromBitArray(this);
  }

  getType() {
    return Type.SGTIN198;
  }

  fromTagURI(uri) {
    const value = uri.split(':');
    try {
      if (value[3] === this.TAG_URI) {
        const data = value[4].split('.');
        const result = new Sgtin198();
        result.setFilter(parseInt(data[0]));
        result.setPartition(12 - data[1].length);
        result.setCompanyPrefix(parseInt(data[1]));
        result.setItemReference(parseInt(data[2]));
        result.setSerial(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, Item, Serial)
    let partition = Sgtin96.PARTITIONS[this.getPartition()];
    return Sgtin198.TAG_URI_TEMPLATE(
      this.getFilter(),
      this.getSegmentString(partition.a),
      this.getSegmentString(partition.b),
      this.getSerial(),
    );
  }

  toIdURI() {
    // C.I.S (Company, Item, Serial)
    let partition = Sgtin96.PARTITIONS[this.getPartition()];
    return Sgtin198.PID_URI_TEMPLATE(
      this.getSegmentString(partition.a),
      this.getSegmentString(partition.b),
      this.getSerial(),
    );
  }

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

  getTotalBits() {
    return Sgtin198.TOTAL_BITS;
  }

  getHeader() {
    return Sgtin198.EPC_HEADER;
  }

  getPartition() {
    return super.get(Sgtin198.PARTITION_OFFSET, Sgtin198.PARTITION_END);
  }

  setPartition(value) {
    if (value < 0 || value >= Sgtin96.PARTITIONS.length) {
      throw new Error(
        `Value '${value}' out of range (min: 0, max: ${Sgtin96.PARTITIONS.length - 1})`,
      );
    }
    super.set(value, Sgtin96.PARTITION_OFFSET, Sgtin96.PARTITION_END);
    return this;
  }

  getGtin() {
    let partition = Sgtin96.PARTITIONS[this.getPartition()];
    let item = super.getSegmentString(partition.b);
    let result =
      item.substring(0, 1) + super.getSegmentString(partition.a) + item.substring(1);
    return result + Utils.computeCheckDigit(result);
  }

  setGtin(gtin) {
    // ean
    let partition = Sgtin96.PARTITIONS[this.getPartition()];
    super.setSegment(gtin.substring(1, partition.a.digits + 1), partition.a);
    super.setSegment(
      Number(
        gtin.charAt(0) +
          gtin.substring(partition.a.digits + 1, partition.a.digits + partition.b.digits),
      ),
      partition.b,
    );
    return this;
  }

  getCompanyPrefix() {
    return super.getSegment(Sgtin96.PARTITIONS[this.getPartition()].a);
  }

  setCompanyPrefix(value) {
    super.setSegment(value, Sgtin96.PARTITIONS[this.getPartition()].a);
    return this;
  }

  getItemReference() {
    return super.getSegment(Sgtin96.PARTITIONS[this.getPartition()].b);
  }

  setItemReference(value) {
    super.setSegment(value, Sgtin96.PARTITIONS[this.getPartition()].b);
    return this;
  }

  getSerial() {
    return super.getString(
      Sgtin198.SERIAL_OFFSET,
      Sgtin198.SERIAL_END,
      Sgtin198.CHAR_BITS,
    );
  }

  /**
   * All values permitted by GS1 General Specifications (up to 20 alphanumeric characters)
   * @param value
   */
  setSerial(value) {
    if (!value || value.length > Sgtin198.MAX_SERIAL_LEN)
      throw new Error(
        `Value '${value}' length out of range (max length: ${Sgtin198.MAX_SERIAL_LEN})`,
      );
    super.setString(
      value,
      Sgtin198.SERIAL_OFFSET,
      Sgtin198.SERIAL_END,
      Sgtin198.CHAR_BITS,
    );
    return this;
  }
}

Sgtin198.EPC_HEADER = 0x36;

Sgtin198.TOTAL_BITS = 198;
Sgtin198.PARTITION_OFFSET = 11;
Sgtin198.PARTITION_END = 14;
Sgtin198.SERIAL_OFFSET = 58;
Sgtin198.SERIAL_END = Sgtin198.TOTAL_BITS;
Sgtin198.MAX_SERIAL_LEN = 20;
Sgtin198.CHAR_BITS =
  (Sgtin198.SERIAL_END - Sgtin198.SERIAL_OFFSET) / Sgtin198.MAX_SERIAL_LEN; // 7

Sgtin198.TAG_URI = 'sgtin-198';

Sgtin198.TAG_URI_TEMPLATE = (filter, company, item, serial) => {
  return `urn:epc:tag:${this.TAG_URI}:${filter}.${company}.${item}.${serial}`;
}; // F.C.I.S (Filter, Company, Item, Serial)
Sgtin198.PID_URI_TEMPLATE = (company, item, serial) => {
  return `urn:epc:id:sgtin:${company}.${item}.${serial}`;
}; // C.I.S   (Company, Item, Serial)