/*
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* Copyright 2008 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import BarcodeFormat from '../BarcodeFormat';
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import DecodeHintType from '../DecodeHintType';
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import Result from '../Result';
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import OneDReader from './OneDReader';
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import EAN13Reader from './EAN13Reader';
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import EAN8Reader from './EAN8Reader';
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import UPCAReader from './UPCAReader';
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import NotFoundException from '../NotFoundException';
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import UPCEReader from './UPCEReader';
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/**
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* <p>A reader that can read all available UPC/EAN formats. If a caller wants to try to
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* read all such formats, it is most efficient to use this implementation rather than invoke
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* individual readers.</p>
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*
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* @author Sean Owen
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*/
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export default class MultiFormatUPCEANReader extends OneDReader {
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constructor(hints) {
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super();
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let possibleFormats = hints == null ? null : hints.get(DecodeHintType.POSSIBLE_FORMATS);
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let readers = [];
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if (possibleFormats != null) {
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if (possibleFormats.indexOf(BarcodeFormat.EAN_13) > -1) {
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readers.push(new EAN13Reader());
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}
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if (possibleFormats.indexOf(BarcodeFormat.UPC_A) > -1) {
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readers.push(new UPCAReader());
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}
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if (possibleFormats.indexOf(BarcodeFormat.EAN_8) > -1) {
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readers.push(new EAN8Reader());
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}
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if (possibleFormats.indexOf(BarcodeFormat.UPC_E) > -1) {
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readers.push(new UPCEReader());
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}
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}
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if (readers.length === 0) {
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readers.push(new EAN13Reader());
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readers.push(new UPCAReader());
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readers.push(new EAN8Reader());
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readers.push(new UPCEReader());
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}
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this.readers = readers;
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}
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decodeRow(rowNumber, row, hints) {
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for (let reader of this.readers) {
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try {
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// const result: Result = reader.decodeRow(rowNumber, row, startGuardPattern, hints);
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const result = reader.decodeRow(rowNumber, row, hints);
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// Special case: a 12-digit code encoded in UPC-A is identical to a "0"
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// followed by those 12 digits encoded as EAN-13. Each will recognize such a code,
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// UPC-A as a 12-digit string and EAN-13 as a 13-digit string starting with "0".
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// Individually these are correct and their readers will both read such a code
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// and correctly call it EAN-13, or UPC-A, respectively.
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//
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// In this case, if we've been looking for both types, we'd like to call it
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// a UPC-A code. But for efficiency we only run the EAN-13 decoder to also read
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// UPC-A. So we special case it here, and convert an EAN-13 result to a UPC-A
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// result if appropriate.
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//
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// But, don't return UPC-A if UPC-A was not a requested format!
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const ean13MayBeUPCA = result.getBarcodeFormat() === BarcodeFormat.EAN_13 &&
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result.getText().charAt(0) === '0';
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// @SuppressWarnings("unchecked")
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const possibleFormats = hints == null ? null : hints.get(DecodeHintType.POSSIBLE_FORMATS);
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const canReturnUPCA = possibleFormats == null || possibleFormats.includes(BarcodeFormat.UPC_A);
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if (ean13MayBeUPCA && canReturnUPCA) {
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const rawBytes = result.getRawBytes();
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// Transfer the metadata across
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const resultUPCA = new Result(result.getText().substring(1), rawBytes, (rawBytes ? rawBytes.length : null), result.getResultPoints(), BarcodeFormat.UPC_A);
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resultUPCA.putAllMetadata(result.getResultMetadata());
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return resultUPCA;
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}
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return result;
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}
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catch (err) {
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// continue;
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}
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}
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throw new NotFoundException();
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}
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reset() {
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for (let reader of this.readers) {
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reader.reset();
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}
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}
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}
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