71 lines
2.8 KiB
C#
Executable File
71 lines
2.8 KiB
C#
Executable File
/*
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* Copyright 2007 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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namespace ZXing
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{
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/// <summary>
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/// The general exception class throw when something goes wrong during decoding of a barcode.
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/// This includes, but is not limited to, failing checksums / error correction algorithms, being
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/// unable to locate finder timing patterns, and so on.
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/// </summary>
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/// <author>Sean Owen</author>
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[Serializable]
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public class ReaderException : Exception
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{
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/// <summary>
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/// Gets the instance.
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/// </summary>
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public static ReaderException Instance
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{
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get
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{
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return instance;
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}
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}
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// TODO: Currently we throw up to 400 ReaderExceptions while scanning a single 240x240 image before
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// rejecting it. This involves a lot of overhead and memory allocation, and affects both performance
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// and latency on continuous scan clients. In the future, we should change all the decoders not to
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// throw exceptions for routine events, like not finding a barcode on a given row. Instead, we
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// should return error codes back to the callers, and simply delete this class. In the mean time, I
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// have altered this class to be as lightweight as possible, by ignoring the exception string, and
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// by disabling the generation of stack traces, which is especially time consuming. These are just
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// temporary measures, pending the big cleanup.
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//UPGRADE_NOTE: Final was removed from the declaration of 'instance '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
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private static readonly ReaderException instance = new ReaderException();
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// EXCEPTION TRACKING SUPPORT
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// Identifies who is throwing exceptions and how often. To use:
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//
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// 1. Uncomment these lines and the code below which uses them.
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// 2. Uncomment the two corresponding lines in j2se/CommandLineRunner.decode()
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// 3. Change core to build as Java 1.5 temporarily
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// private static int exceptionCount = 0;
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// private static Map<String,Integer> throwers = new HashMap<String,Integer>(32);
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/// <summary>
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/// Initializes a new instance of the <see cref="ReaderException"/> class.
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/// </summary>
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protected ReaderException()
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{
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// do nothing
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}
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}
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} |