forked from angular/angular
/
injector.js
133 lines (108 loc) · 3.76 KB
/
injector.js
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
import {Map, List, MapWrapper, ListWrapper} from 'facade/collection';
import {Binding, BindingBuilder, bind} from './binding';
import {NoProviderError, InvalidBindingError, AsyncProviderError} from './exceptions';
import {Type, isPresent, isBlank} from 'facade/lang';
import {Future, FutureWrapper} from 'facade/async';
import {Key} from './key';
export class Injector {
constructor(bindings:List) {
var flatten = _flattenBindings(bindings);
this._bindings = this._createListOfBindings(flatten);
this._instances = this._createInstances();
this._parent = null; //TODO: vsavkin make a parameter
}
_createListOfBindings(flattenBindings):List {
var bindings = ListWrapper.createFixedSize(Key.numberOfKeys() + 1);
MapWrapper.forEach(flattenBindings, (keyId, v) => bindings[keyId] = v);
return bindings;
}
_createInstances():List {
return ListWrapper.createFixedSize(Key.numberOfKeys() + 1);
}
get(token) {
return this.getByKey(Key.get(token));
}
asyncGet(token) {
return this.asyncGetByKey(Key.get(token));
}
getByKey(key:Key) {
return this._getByKey(key, [], false);
}
asyncGetByKey(key:Key) {
return this._getByKey(key, [], true);
}
_getByKey(key:Key, resolving:List, async) {
var keyId = key.id;
//TODO: vsavkin: use LinkedList to remove clone
resolving = ListWrapper.clone(resolving)
ListWrapper.push(resolving, key);
if (key.token === Injector) return this._injector(async);
var instance = this._get(this._instances, keyId);
if (isPresent(instance)) return instance;
var binding = this._get(this._bindings, keyId);
if (isPresent(binding)) {
return this._instantiate(key, binding, resolving, async);
}
if (isPresent(this._parent)) {
return this._parent._getByKey(key, resolving, async);
}
throw new NoProviderError(resolving);
}
createChild(bindings:List):Injector {
var inj = new Injector(bindings);
inj._parent = this; //TODO: vsavkin: change it when optional parameters are working
return inj;
}
_injector(async){
return async ? FutureWrapper.value(this) : this;
}
_get(list:List, index){
if (list.length <= index) return null;
return ListWrapper.get(list, index);
}
_instantiate(key:Key, binding:Binding, resolving:List, async) {
if (binding.async && !async) {
throw new AsyncProviderError(resolving);
}
if (async) {
return this._instantiateAsync(key, binding, resolving, async);
} else {
return this._instantiateSync(key, binding, resolving, async);
}
}
_instantiateSync(key:Key, binding:Binding, resolving:List, async) {
var deps = ListWrapper.map(binding.dependencies, d => this._getByKey(d, resolving, false));
var instance = binding.factory(deps);
ListWrapper.set(this._instances, key.id, instance);
if (!binding.async && async) {
return FutureWrapper.value(instance);
}
return instance;
}
_instantiateAsync(key:Key, binding:Binding, resolving:List, async):Future {
var instances = this._createInstances();
var futures = ListWrapper.map(binding.dependencies, d => this._getByKey(d, resolving, true));
return FutureWrapper.wait(futures).
then(binding.factory).
then(function(instance) {
ListWrapper.set(instances, key.id, instance);
return instance
});
}
}
function _flattenBindings(bindings:List) {
var res = {};
ListWrapper.forEach(bindings, function (b){
if (b instanceof Binding) {
MapWrapper.set(res, b.key.id, b);
} else if (b instanceof Type) {
var s = bind(b).toClass(b);
MapWrapper.set(res, s.key.id, s);
} else if (b instanceof BindingBuilder) {
throw new InvalidBindingError(b.token);
} else {
throw new InvalidBindingError(b);
}
});
return res;
}