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d4efd44fb0
git-svn-id: https://zxing.googlecode.com/svn/trunk@1202 59b500cc-1b3d-0410-9834-0bbf25fbcc57
109 lines
4 KiB
C#
Executable file
109 lines
4 KiB
C#
Executable file
/*
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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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using System;
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using BarcodeFormat = com.google.zxing.BarcodeFormat;
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using DecodeHintType = com.google.zxing.DecodeHintType;
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using ReaderException = com.google.zxing.ReaderException;
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using Result = com.google.zxing.Result;
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using BitArray = com.google.zxing.common.BitArray;
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namespace com.google.zxing.oned
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{
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/// <summary> <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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/// </summary>
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/// <author> Sean Owen
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/// </author>
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/// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source
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/// </author>
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public sealed class MultiFormatUPCEANReader:OneDReader
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{
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//UPGRADE_NOTE: Final was removed from the declaration of 'readers '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
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private System.Collections.ArrayList readers;
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public MultiFormatUPCEANReader(System.Collections.Hashtable hints)
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{
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System.Collections.ArrayList possibleFormats = hints == null?null:(System.Collections.ArrayList) hints[DecodeHintType.POSSIBLE_FORMATS];
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readers = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10));
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if (possibleFormats != null)
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{
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if (possibleFormats.Contains(BarcodeFormat.EAN_13))
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{
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readers.Add(new EAN13Reader());
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}
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else if (possibleFormats.Contains(BarcodeFormat.UPC_A))
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{
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readers.Add(new UPCAReader());
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}
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if (possibleFormats.Contains(BarcodeFormat.EAN_8))
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{
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readers.Add(new EAN8Reader());
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}
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if (possibleFormats.Contains(BarcodeFormat.UPC_E))
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{
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readers.Add(new UPCEReader());
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}
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}
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if ((readers.Count == 0))
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{
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readers.Add(new EAN13Reader());
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// UPC-A is covered by EAN-13
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readers.Add(new EAN8Reader());
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readers.Add(new UPCEReader());
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}
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}
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public override Result decodeRow(int rowNumber, BitArray row, System.Collections.Hashtable hints)
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{
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// Compute this location once and reuse it on multiple implementations
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int[] startGuardPattern = UPCEANReader.findStartGuardPattern(row);
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int size = readers.Count;
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for (int i = 0; i < size; i++)
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{
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UPCEANReader reader = (UPCEANReader) readers[i];
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Result result;
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try
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{
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result = reader.decodeRow(rowNumber, row, startGuardPattern, hints);
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}
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catch (ReaderException re)
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{
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continue;
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}
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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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if (result.BarcodeFormat.Equals(BarcodeFormat.EAN_13) && result.Text[0] == '0')
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{
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return new Result(result.Text.Substring(1), null, result.ResultPoints, BarcodeFormat.UPC_A);
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}
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return result;
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}
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throw ReaderException.Instance;
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}
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}
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} |