/
ContextException.java
78 lines (70 loc) · 2.53 KB
/
ContextException.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
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
/*
* Copyright 2015 Austin Keener, Michael Ritter, Florian Spieß, and the JDA contributors
*
* 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 net.dv8tion.jda.api.exceptions;
import net.dv8tion.jda.internal.utils.Helpers;
import javax.annotation.Nonnull;
import java.util.function.Consumer;
/**
* Used to pass a context to async exception handling for debugging purposes.
*/
public class ContextException extends Exception
{
/**
* Creates a failure consumer that appends a context cause
* before printing the stack trace using {@link Throwable#printStackTrace()}.
* <br>Equivalent to {@code here(Throwable::printStackTrace)}
*
* @return Wrapping failure consumer around {@code Throwable::printStackTrace}
*/
@Nonnull
public static Consumer<Throwable> herePrintingTrace()
{
return here(Throwable::printStackTrace);
}
/**
* Creates a wrapping {@link java.util.function.Consumer Consumer} for
* the provided target.
*
* @param acceptor
* The end-target for the throwable
*
* @return Wrapper of the provided consumer that will append a context with the current stack-trace
*/
@Nonnull
public static Consumer<Throwable> here(@Nonnull Consumer<? super Throwable> acceptor)
{
return new ContextConsumer(new ContextException(), acceptor);
}
/**
* Wrapper for a failure {@link Consumer} that carries a {@link ContextException} as cause.
*/
public static class ContextConsumer implements Consumer<Throwable>
{
private final ContextException context;
private final Consumer<? super Throwable> callback;
private ContextConsumer(ContextException context, Consumer<? super Throwable> callback)
{
this.context = context;
this.callback = callback;
}
@Override
public void accept(Throwable throwable)
{
if (callback != null)
callback.accept(Helpers.appendCause(throwable, context));
}
}
}