blob: dd5b6094dcca410fc0b0e7420577dbf41e2801a8 (
plain) (
blame)
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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
* Copyright (c) OSGi Alliance (2017). All Rights Reserved.
*
* 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 org.osgi.util.promise;
import static java.util.Objects.requireNonNull;
import java.lang.reflect.InvocationTargetException;
import org.osgi.util.function.Consumer;
import org.osgi.util.function.Function;
import org.osgi.util.function.Predicate;
/**
* Failed Promise implementation.
* <p>
* This class is not used directly by clients. Clients should use
* {@link PromiseFactory#failed(Throwable)} to create a failed {@link Promise}.
*
* @param <T> The result type associated with the Promise.
* @since 1.1
* @ThreadSafe
* @author $Id$
*/
final class FailedPromiseImpl<T> extends PromiseImpl<T> {
/**
* The failure of this failed Promise.
*/
private final Throwable fail;
/**
* Initialize this failed Promise.
*
* @param fail The failure of this failed Promise. Must not be {@code null}.
* @param factory The factory to use for callbacks and scheduled operations.
*/
FailedPromiseImpl(Throwable fail, PromiseFactory factory) {
super(factory);
this.fail = requireNonNull(fail);
}
/**
* {@inheritDoc}
*/
@Override
public boolean isDone() {
return true;
}
/**
* {@inheritDoc}
*/
@Override
public T getValue() throws InvocationTargetException {
throw new InvocationTargetException(fail);
}
/**
* {@inheritDoc}
*/
@Override
public Throwable getFailure() {
return fail;
}
/**
* {@inheritDoc}
*/
@Override
Result<T> collect() {
return new Result<T>(fail);
}
@Override
public String toString() {
return super.toString() + "[failed: " + fail + "]";
}
/**
* Coerce the value type of this FailedPromiseImpl.
*
* @return This FailedPromiseImpl.
*/
@SuppressWarnings("unchecked")
private <V> FailedPromiseImpl<V> coerce() {
return (FailedPromiseImpl<V>) this;
}
/**
* {@inheritDoc}
*/
@Override
public Promise<T> onSuccess(Consumer< ? super T> success) {
requireNonNull(success);
return this;
}
/**
* {@inheritDoc}
*/
@Override
public <R> Promise<R> then(Success< ? super T, ? extends R> success,
Failure failure) {
if (failure == null) {
return coerce();
}
return super.then(success, failure);
}
/**
* {@inheritDoc}
*/
@Override
public Promise<T> thenAccept(Consumer< ? super T> consumer) {
requireNonNull(consumer);
return this;
}
/**
* {@inheritDoc}
*/
@Override
public Promise<T> filter(Predicate< ? super T> predicate) {
requireNonNull(predicate);
return this;
}
/**
* {@inheritDoc}
*/
@Override
public <R> Promise<R> map(Function< ? super T, ? extends R> mapper) {
requireNonNull(mapper);
return coerce();
}
/**
* {@inheritDoc}
*/
@Override
public <R> Promise<R> flatMap(
Function< ? super T,Promise< ? extends R>> mapper) {
requireNonNull(mapper);
return coerce();
}
/**
* {@inheritDoc}
*/
@Override
public Promise<T> timeout(long millis) {
return this;
}
}
|
