blob: bfdfe6b912bb28c22a9d568ab4a06c5275775a3b (
plain)
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
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/*********************************************************************
* Sangria *
* Copyright (C) 2014 Tavian Barnes <tavianator@tavianator.com> *
* *
* This library is free software. It comes without any warranty, to *
* the extent permitted by applicable law. You can redistribute it *
* and/or modify it under the terms of the Do What The Fuck You Want *
* To Public License, Version 2, as published by Sam Hocevar. See *
* the COPYING file or http://www.wtfpl.net/ for more details. *
*********************************************************************/
package com.tavianator.sangria.core;
import java.lang.annotation.Annotation;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.concurrent.atomic.AtomicLong;
import javax.inject.Qualifier;
import com.google.common.annotations.VisibleForTesting;
/**
* Re-implementation of Guice's internal UniqueAnnotations utility.
*
* @author Tavian Barnes (tavianator@tavianator.com)
* @version 1.0
* @since 1.0
*/
public class UniqueAnnotations {
private static final AtomicLong SEQUENCE = new AtomicLong();
private UniqueAnnotations() {
// Not for instantiating
}
@Retention(RetentionPolicy.RUNTIME)
@Qualifier
@VisibleForTesting
@interface UniqueAnnotation {
long value();
}
/**
* Actual implementation of {@link UniqueAnnotation}.
*/
@SuppressWarnings("ClassExplicitlyAnnotation")
private static class UniqueAnnotationImpl implements UniqueAnnotation {
private final long value;
UniqueAnnotationImpl(long value) {
this.value = value;
}
@Override
public long value() {
return value;
}
public Class<? extends Annotation> annotationType() {
return UniqueAnnotation.class;
}
@Override
public String toString() {
return "@" + UniqueAnnotation.class.getName() + "(value=" + value + ")";
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
} else if (!(obj instanceof UniqueAnnotation)) {
return false;
}
UniqueAnnotation other = (UniqueAnnotation)obj;
return value == other.value();
}
@Override
public int hashCode() {
return (127*"value".hashCode()) ^ Long.valueOf(value).hashCode();
}
}
/**
* @return An {@link Annotation} that will be unequal to every other annotation.
*/
public static Annotation create() {
return create(SEQUENCE.getAndIncrement());
}
@VisibleForTesting
static Annotation create(long value) {
return new UniqueAnnotationImpl(value);
}
}
|