@ombori/epc-ean/src/epc/grai/grai170.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 { Grai96 } from './grai96';

export class Grai170 extends Epc {
  constructor(hexEpc) {
    super(Grai170.TOTAL_BITS);
    if (hexEpc) {
      super.setFromHexString(hexEpc);
    } else {
      super.set(Grai170.EPC_HEADER, Epc.EPC_HEADER_OFFSET, Epc.EPC_HEADER_END);
    }
  }

  clone() {
    return new Grai170().setFromBitArray(this);
  }

  getType() {
    return Type.GRAI170;
  }

  fromTagURI(uri) {
    const value = uri.split(':');
    try {
      if (value[3] === this.TAG_URI) {
        const data = value[4].split('.');
        const result = new Grai170();
        result.setFilter(parseInt(data[0]));
        result.setPartition(12 - data[1].length);
        result.setCompanyPrefix(parseInt(data[1]));
        result.setAssetType(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, Asset Type, Serial)
    let partition = Grai96.PARTITIONS[this.getPartition()];
    return Grai170.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 Grai170.PID_URI_TEMPLATE(
      this.getSegmentString(partition.a),
      this.getSegmentString(partition.b),
      this.getSerial(),
    );
  }

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

  getTotalBits() {
    return Grai170.TOTAL_BITS;
  }

  getHeader() {
    return Grai170.EPC_HEADER;
  }

  getPartition() {
    return super.get(Grai170.PARTITION_OFFSET, Grai170.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, Grai170.PARTITION_OFFSET, Grai170.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(String(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.getString(Grai170.SERIAL_OFFSET, Grai170.SERIAL_END, Grai170.CHAR_BITS);
  }

  /**
   * All values permitted by GS1 General Specifications (up to 16 alphanumeric characters)
   * @param value
   */
  setSerial(value) {
    if (!value || value.length > Grai170.MAX_SERIAL_LEN)
      throw new Error(
        `Value '${value}' length out of range (max length: ${Grai170.MAX_SERIAL_LEN})`,
      );
    super.setString(value, Grai170.SERIAL_OFFSET, Grai170.SERIAL_END, Grai170.CHAR_BITS);
    return this;
  }
}

Grai170.EPC_HEADER = 0x37;

Grai170.TOTAL_BITS = 170;
Grai170.PARTITION_OFFSET = 11;
Grai170.PARTITION_END = 14;
Grai170.SERIAL_OFFSET = 58;
Grai170.SERIAL_END = Grai170.TOTAL_BITS;
Grai170.SERIAL_BITS = 112;
Grai170.MAX_SERIAL_LEN = 16;
Grai170.CHAR_BITS = (Grai170.SERIAL_END - Grai170.SERIAL_OFFSET) / Grai170.MAX_SERIAL_LEN; // 7

Grai170.TAG_URI = 'grai-170';

Grai170.TAG_URI_TEMPLATE = (filter, company, asset, serial) => {
  return `urn:epc:tag:${this.TAG_URI}:${filter}.${company}.${asset}.${serial}`;
}; // F.C.A.S (Filter, Company, AssetType, Serial)
Grai170.PID_URI_TEMPLATE = (company, asset, serial) => {
  return `urn:epc:id:grai:${company}.${asset}.${serial}`;
}; // C.A.S   (Company, AssetType, Serial)