blob: 2ff2af615c7e2b977bcf569438a31535cc320707 (
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
|
/**
* Copyright (C) 2006 Google Inc.
*
* 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.google.inject.internal;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Maps;
import com.google.inject.Key;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.DependencyAndSource;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
/**
* Internal context. Used to coordinate injections and support circular
* dependencies.
*
* @author crazybob@google.com (Bob Lee)
*/
final class InternalContext {
private Map<Object, ConstructionContext<?>> constructionContexts = Maps.newHashMap();
/** Keeps track of the type that is currently being requested for injection. */
private Dependency dependency;
/** Keeps track of the hierarchy of types needed during injection. */
private LinkedList<DependencyAndSource> state = new LinkedList<DependencyAndSource>();
@SuppressWarnings("unchecked")
public <T> ConstructionContext<T> getConstructionContext(Object key) {
ConstructionContext<T> constructionContext
= (ConstructionContext<T>) constructionContexts.get(key);
if (constructionContext == null) {
constructionContext = new ConstructionContext<T>();
constructionContexts.put(key, constructionContext);
}
return constructionContext;
}
public Dependency getDependency() {
return dependency;
}
/** Sets the new current dependency & adds it to the state. */
public Dependency pushDependency(Dependency dependency, Object source) {
Dependency previous = this.dependency;
this.dependency = dependency;
state.addLast(new DependencyAndSource(dependency, source));
return previous;
}
/** Pops the current state & sets the new dependency. */
public void popStateAndSetDependency(Dependency newDependency) {
popState();
this.dependency = newDependency;
}
/** Adds to the state without setting the dependency. */
public void pushState(Key<?> key, Object source) {
state.addLast(new DependencyAndSource(key == null ? null : Dependency.get(key), source));
}
/** Pops from the state without setting a dependency. */
public void popState() {
state.removeLast();
}
/** Returns the current dependency chain (all the state). */
public List<DependencyAndSource> getDependencyChain() {
return ImmutableList.copyOf(state);
}
}
|
