blob: 19853fa474a21db998ee5b7bc58aea16fcb53bae (
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
|
/*
* Copyright 2000-2018 Vaadin Ltd.
*
* 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.vaadin.util;
import java.io.Serializable;
/**
* Fallback that is used to revolve current instances when they are not
* available by regular means.
* <p>
* This interface is used internally by the framework and it's not meant for
* public usage.
*
* @author Vaadin Ltd.
*
* @param <T>
* the type of the instances returned by this resolver
*
* @see CurrentInstance#get(Class)
* @see CurrentInstance#defineFallbackResolver(Class,
* CurrentInstanceFallbackResolver)
*
* @since 8.5.2
*
*/
public interface CurrentInstanceFallbackResolver<T> extends Serializable {
/**
* Resolves a current instance for the type {@code T}.
*
* @return the current instance, or <code>null</code> if none can be found
*/
T resolve();
}
|
