1/**
2 * Copyright (C) 2009 Google Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.inject.internal;
18
19import com.google.common.collect.Lists;
20import com.google.inject.Key;
21import com.google.inject.MembersInjector;
22import com.google.inject.Provider;
23import com.google.inject.TypeLiteral;
24import com.google.inject.spi.Element;
25import com.google.inject.spi.MembersInjectorLookup;
26import com.google.inject.spi.ProviderLookup;
27
28import java.util.List;
29
30/**
31 * Returns providers and members injectors that haven't yet been initialized. As a part of injector
32 * creation it's necessary to {@link #initialize initialize} these lookups.
33 *
34 * @author jessewilson@google.com (Jesse Wilson)
35 */
36final class DeferredLookups implements Lookups {
37  private final InjectorImpl injector;
38  private final List<Element> lookups = Lists.newArrayList();
39
40  DeferredLookups(InjectorImpl injector) {
41    this.injector = injector;
42  }
43
44  /**
45   * Initialize the specified lookups, either immediately or when the injector is created.
46   */
47  void initialize(Errors errors) {
48    injector.lookups = injector;
49    new LookupProcessor(errors).process(injector, lookups);
50  }
51
52  public <T> Provider<T> getProvider(Key<T> key) {
53    ProviderLookup<T> lookup = new ProviderLookup<T>(key, key);
54    lookups.add(lookup);
55    return lookup.getProvider();
56  }
57
58  public <T> MembersInjector<T> getMembersInjector(TypeLiteral<T> type) {
59    MembersInjectorLookup<T> lookup = new MembersInjectorLookup<T>(type, type);
60    lookups.add(lookup);
61    return lookup.getMembersInjector();
62  }
63}
64