@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
73 lines (72 loc) • 2.54 kB
JavaScript
/*
* 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 Result from '../Result';
import NotFoundException from '../NotFoundException';
import EAN13Reader from './EAN13Reader';
import UPCEANReader from './UPCEANReader';
/**
* 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 {
constructor() {
super(...arguments);
this.ean13Reader = new EAN13Reader();
}
// @Override
getBarcodeFormat() {
return BarcodeFormat.UPC_A;
}
// Note that we don't try rotation without the try harder flag, even if rotation was supported.
// @Override
decode(image, hints) {
return this.maybeReturnResult(this.ean13Reader.decode(image));
}
// @Override
decodeRow(rowNumber, row, hints) {
return this.maybeReturnResult(this.ean13Reader.decodeRow(rowNumber, row, hints));
}
// @Override
decodeMiddle(row, startRange, resultString) {
return this.ean13Reader.decodeMiddle(row, startRange, resultString);
}
maybeReturnResult(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();
}
}
reset() {
this.ean13Reader.reset();
}
}