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
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
/*
* Copyright © 2009 Reinier Zwitserloot and Roel Spilker.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* @SneakyThrow will avoid javac's insistence that you either catch or throw onward any checked exceptions that
* statements in your method body declare they generate.
* <p>
* @SneakyThrow does not silently swallow, wrap into RuntimeException, or otherwise modify any exceptions of the listed
* checked exception types. The JVM does not check for the consistency of the checked exception system; javac does,
* and this annotation lets you opt out of its mechanism.
* <p>
* You should use this annotation ONLY in the following two cases:<ol>
* <li>You are certain the listed exception can't actually ever happen, or only in vanishingly rare situations.
* You don't try to catch OutOfMemoryError on every statement either. Examples:<br>
* <code>IOException</code> in <code>ByteArrayOutputStream</code><br>
* <code>UnsupportedEncodingException</code> in new String(byteArray, "UTF-8").</li>
* <li>You know for certain the caller can handle the exception (for example, because the caller is
* an app manager that will handle all throwables that fall out of your method the same way), but due
* to interface restrictions you can't just add these exceptions to your 'throws' clause.
* <p>
* Note that, as SneakyThrow is an implementation detail and <i>NOT</i> part of your method signature, it is
* a compile time error if none of the statements in your method body can throw a listed exception.
* <p>
* <b><i>WARNING: </b></i>You must have lombok.jar available at the runtime of your app if you use SneakyThrows,
* because your code is rewritten to use {@link Lombok#sneakyThrow(Throwable)}.
* <p>
* <p>
* Example:
* <pre>
* @SneakyThrows(UnsupportedEncodingException.class)
* public void utf8ToString(byte[] bytes) {
* return new String(bytes, "UTF-8");
* }
* </pre>
*
* <code>@SneakyThrows</code> without a parameter defaults to allowing <i>every</i> checked exception.
* (The default is <code>Throwable.class</code>).
*
* @see Lombok#sneakyThrow(Throwable)
*/
@Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
@Retention(RetentionPolicy.SOURCE)
public @interface SneakyThrows {
/** The exception type(s) you want to sneakily throw onward. */
Class<? extends Throwable>[] value() default java.lang.Throwable.class;
//The package is mentioned in java.lang due to a bug in javac (presence of an annotation processor throws off the type resolver for some reason).
}
|
