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99 lines
3.7 KiB
Java
99 lines
3.7 KiB
Java
/*
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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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package com.google.zxing;
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/**
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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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*
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* @author Sean Owen
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*/
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public abstract class ReaderException extends Exception {
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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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//private static final 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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ReaderException() {
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// do nothing
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}
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//public static ReaderException getInstance() {
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// Exception e = new Exception();
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// // Take the stack frame before this one.
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// StackTraceElement stack = e.getStackTrace()[1];
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// String key = stack.getClassName() + "." + stack.getMethodName() + "(), line " +
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// stack.getLineNumber();
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// if (throwers.containsKey(key)) {
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// Integer value = throwers.get(key);
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// value++;
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// throwers.put(key, value);
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// } else {
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// throwers.put(key, 1);
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// }
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// exceptionCount++;
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//return instance;
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//}
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// public static int getExceptionCountAndReset() {
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// int temp = exceptionCount;
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// exceptionCount = 0;
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// return temp;
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// }
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//
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// public static String getThrowersAndReset() {
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// StringBuilder builder = new StringBuilder(1024);
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// Object[] keys = throwers.keySet().toArray();
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// for (int x = 0; x < keys.length; x++) {
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// String key = (String) keys[x];
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// Integer value = throwers.get(key);
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// builder.append(key);
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// builder.append(": ");
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// builder.append(value);
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// builder.append("\n");
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// }
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// throwers.clear();
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// return builder.toString();
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// }
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// Prevent stack traces from being taken
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// srowen says: huh, my IDE is saying this is not an override. native methods can't be overridden?
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// This, at least, does not hurt. Because we use a singleton pattern here, it doesn't matter anyhow.
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public final Throwable fillInStackTrace() {
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return null;
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}
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}
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