@ombori/epc-ean/src/epc/gdti/gdti174.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 Gdti174 extends Epc {
  constructor(hexEpc) {
    super(Gdti174.TOTAL_BITS);
    if (hexEpc) {
      super.setFromHexString(hexEpc);
    } else {
      super.set(Gdti174.EPC_HEADER, Epc.EPC_HEADER_OFFSET, Epc.EPC_HEADER_END);
    }
  }

  clone() {
    return new Gdti174().setFromBitArray(this);
  }

  getType() {
    return Type.Gdti174;
  }

  fromTagURI(uri) {
    const value = uri.split(':');
    try {
      if (value[3] === this.TAG_URI) {
        const data = value[4].split('.');
        const result = new Gdti174();
        result.setFilter(parseInt(data[0]));
        result.setPartition(12 - data[1].length);
        result.setCompanyPrefix(parseInt(data[1]));
        result.setDocumentReference(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.D.S (Filter, Company, Document, Serial)
    let partition = Gdti174.PARTITIONS[this.getPartition()];
    return Gdti174.TAG_URI_TEMPLATE(
      this.getFilter(),
      this.getSegmentString(partition.a),
      this.getSegmentString(partition.b),
      this.getSerial(),
    );
  }

  toIdURI() {
    // C.D.S (Company, Document, Serial)
    let partition = Gdti174.PARTITIONS[this.getPartition()];
    return Gdti174.PID_URI_TEMPLATE(
      this.getSegmentString(partition.a),
      this.getSegmentString(partition.b),
      this.getSerial(),
    );
  }

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

  getTotalBits() {
    return Gdti174.TOTAL_BITS;
  }

  getHeader() {
    return Gdti174.EPC_HEADER;
  }

  getPartition() {
    return super.get(Gdti174.PARTITION_OFFSET, Gdti174.PARTITION_END);
  }

  setPartition(value) {
    if (value < 0 || value >= Gdti174.PARTITIONS.length) {
      throw new Error(
        `Value '${value}' out of range (min: 0, max: ${Gdti174.PARTITIONS.length - 1})`,
      );
    }
    super.set(value, Gdti174.PARTITION_OFFSET, Gdti174.PARTITION_END);
    return this;
  }

  getGdti() {
    let partition = Gdti174.PARTITIONS[this.getPartition()];
    let companyPrefix = super.getSegmentString(partition.a);
    let document = super.getSegmentString(partition.b);
    let result = companyPrefix + document;
    return result + Utils.computeCheckDigit(result) + this.getSerial();
  }

  setGdti(gdti) {
    let partition = Gdti174.PARTITIONS[this.getPartition()];
    super.setSegment(gdti.substring(0, partition.a.digits), partition.a);
    let tmp = partition.a.digits + partition.b.digits;
    super.setSegment(gdti.substring(partition.a.digits, tmp), partition.b);
    this.setSerial(gdti.substring(tmp + 1, gdti.length));
    return this;
  }

  getCompanyPrefix() {
    return super.getSegment(Gdti174.PARTITIONS[this.getPartition()].a);
  }

  setCompanyPrefix(value) {
    super.setSegment(value, Gdti174.PARTITIONS[this.getPartition()].a);
    return this;
  }

  getDocumentReference() {
    return super.getSegment(Gdti174.PARTITIONS[this.getPartition()].b);
  }

  setDocumentReference(value) {
    super.setSegment(value, Gdti174.PARTITIONS[this.getPartition()].b);
    return this;
  }

  getSerial() {
    return super.getString(Gdti174.SERIAL_OFFSET, Gdti174.SERIAL_END, Gdti174.CHAR_BITS);
  }

  setSerial(value) {
    if (!value || value.length > Gdti174.MAX_SERIAL_LEN)
      throw new Error(
        `Value '${value}' length out of range (max length: ${Gdti174.MAX_SERIAL_LEN})`,
      );
    super.setString(value, Gdti174.SERIAL_OFFSET, Gdti174.SERIAL_END, Gdti174.CHAR_BITS);
    return this;
  }
}

Gdti174.EPC_HEADER = 0x3e;

Gdti174.TOTAL_BITS = 174;
Gdti174.PARTITION_OFFSET = 11;
Gdti174.PARTITION_END = 14;
Gdti174.SERIAL_OFFSET = 55;
Gdti174.SERIAL_END = Gdti174.TOTAL_BITS;
Gdti174.SERIAL_BITS = 119;
Gdti174.MAX_SERIAL_LEN = 17;
Gdti174.CHAR_BITS = (Gdti174.SERIAL_END - Gdti174.SERIAL_OFFSET) / Gdti174.MAX_SERIAL_LEN; // 7

Gdti174.TAG_URI = 'gdti-174';

Gdti174.TAG_URI_TEMPLATE = (filter, company, document, serial) => {
  return `urn:epc:tag:${this.TAG_URI}:${filter}.${company}.${document}.${serial}`;
}; // F.C.D.S (Filter, Company, Document, Serial)
Gdti174.PID_URI_TEMPLATE = (company, document, serial) => {
  return `urn:epc:id:gdti:${company}.${document}.${serial}`;
}; // C.D.S   (Company, Document, Serial)

// Partition table columns: Company prefix, Item Reference
Gdti174.PARTITIONS = [
  new Partition(Gdti174.PARTITION_END, 40, 12, 1, 0), // 0 40 12 01 0
  new Partition(Gdti174.PARTITION_END, 37, 11, 4, 1), // 1 37 11 04 1
  new Partition(Gdti174.PARTITION_END, 34, 10, 7, 2), // 2 34 10 07 2
  new Partition(Gdti174.PARTITION_END, 30, 9, 11, 3), // 3 30 09 11 3
  new Partition(Gdti174.PARTITION_END, 27, 8, 14, 4), // 4 27 08 14 4
  new Partition(Gdti174.PARTITION_END, 24, 7, 17, 5), // 5 24 07 17 5
  new Partition(Gdti174.PARTITION_END, 20, 6, 21, 6),
]; // 6 20 06 21 6