/
ReaderException.java
52 lines (44 loc) · 1.98 KB
/
ReaderException.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
/*
* Copyright 2007 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.
*/
package com.google.zxing;
/**
* The general exception class throw when something goes wrong during decoding of a barcode.
* This includes, but is not limited to, failing checksums / error correction algorithms, being
* unable to locate finder timing patterns, and so on.
*
* @author Sean Owen
*/
public final class ReaderException extends Exception {
// TODO: Currently we throw up to 400 ReaderExceptions while scanning a single 240x240 image before
// rejecting it. This involves a lot of overhead and memory allocation, and affects both performance
// and latency on continuous scan clients. In the future, we should change all the decoders not to
// throw exceptions for routine events, like not finding a barcode on a given row. Instead, we
// should return error codes back to the callers, and simply delete this class. In the mean time, I
// have altered this class to be as lightweight as possible, by ignoring the exception string, and
// by disabling the generation of stack traces, which is especially time consuming. These are just
// temporary measures, pending the big cleanup.
private static final ReaderException instance = new ReaderException();
private ReaderException() {
// do nothing
}
public static ReaderException getInstance() {
return instance;
}
// Prevent stack traces from being taken
public Throwable fillInStackTrace() {
return null;
}
}