1/**
2 * Copyright (C) 2011 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 static com.google.common.base.Preconditions.checkNotNull;
20
21import com.google.inject.spi.Dependency;
22import com.google.inject.spi.ProviderInstanceBinding;
23
24/**
25 * Adapts {@link ProviderInstanceBinding} providers, ensuring circular proxies
26 * fail (or proxy) properly.
27 *
28 * @author sameb@google.com (Sam Berlin)
29*/
30final class InternalFactoryToInitializableAdapter<T> extends ProviderInternalFactory<T> {
31
32  private final ProvisionListenerStackCallback<T> provisionCallback;
33  private final Initializable<? extends javax.inject.Provider<? extends T>> initializable;
34
35  public InternalFactoryToInitializableAdapter(
36      Initializable<? extends javax.inject.Provider<? extends T>> initializable,
37      Object source, ProvisionListenerStackCallback<T> provisionCallback) {
38    super(source);
39    this.provisionCallback = checkNotNull(provisionCallback, "provisionCallback");
40    this.initializable = checkNotNull(initializable, "provider");
41  }
42
43  public T get(Errors errors, InternalContext context, Dependency<?> dependency, boolean linked)
44      throws ErrorsException {
45    return circularGet(initializable.get(errors), errors, context, dependency,
46        provisionCallback);
47  }
48
49  @Override
50  protected T provision(javax.inject.Provider<? extends T> provider, Errors errors,
51      Dependency<?> dependency, ConstructionContext<T> constructionContext) throws ErrorsException {
52    try {
53      return super.provision(provider, errors, dependency, constructionContext);
54    } catch(RuntimeException userException) {
55      throw errors.withSource(source).errorInProvider(userException).toException();
56    }
57  }
58
59  @Override public String toString() {
60    return initializable.toString();
61  }
62}
63