zxing-js/library

/*
 * Copyright 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*namespace com.google.zxing.oned {*/

import BarcodeFormat from '../BarcodeFormat';
import BinaryBitmap from '../BinaryBitmap';
import BitArray from '../common/BitArray';
import DecodeHintType from '../DecodeHintType';

import Reader from '../Reader';
import Result from '../Result';
import ResultMetadataType from '../ResultMetadataType';
import ResultPoint from '../ResultPoint';
import NotFoundException from '../NotFoundException';

import EAN13Reader from './EAN13Reader';
import UPCEANReader from './UPCEANReader';
import { int } from 'src/customTypings';

/**
 * Encapsulates functionality and implementation that is common to all families
 * of one-dimensional barcodes.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 * @author Sean Owen
 * @author sam2332 (Sam Rudloff)
 *
 * @source https://github.com/zxing/zxing/blob/3c96923276dd5785d58eb970b6ba3f80d36a9505/core/src/main/java/com/google/zxing/oned/UPCAReader.java
 *
 * @experimental
 */
export default class UPCAReader extends UPCEANReader {

  private readonly ean13Reader = new EAN13Reader();

  // @Override
  public getBarcodeFormat(): BarcodeFormat {
    return BarcodeFormat.UPC_A;
  }

  // Note that we don't try rotation without the try harder flag, even if rotation was supported.
  // @Override
  public decode(image: BinaryBitmap, hints?: Map<DecodeHintType, any>): Result {
    return this.maybeReturnResult(this.ean13Reader.decode(image));
  }

  // @Override
  public decodeRow(rowNumber: number, row: BitArray, hints?: Map<DecodeHintType, any>): Result {
    return this.maybeReturnResult(this.ean13Reader.decodeRow(rowNumber, row, hints));
  }

  // @Override
  public decodeMiddle(row: BitArray, startRange: Int32Array, resultString: string) {
    return this.ean13Reader.decodeMiddle(row, startRange, resultString);
  }

  public maybeReturnResult(result: Result) {
    let text = result.getText();
    if (text.charAt(0) === '0') {
      let upcaResult = new Result(text.substring(1), null, null, result.getResultPoints(), BarcodeFormat.UPC_A);
      if (result.getResultMetadata() != null) {
        upcaResult.putAllMetadata(result.getResultMetadata());
      }
      return upcaResult;
    } else {
      throw new NotFoundException();
    }
  }

  public reset() {
    this.ean13Reader.reset();
  }
}