1/**
2 * Copyright (C) 2007 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.throwingproviders;
18
19import static java.lang.annotation.RetentionPolicy.RUNTIME;
20
21import com.google.inject.Key;
22import com.google.inject.Provider;
23import com.google.inject.Scope;
24import com.google.inject.ScopeAnnotation;
25
26import java.lang.annotation.Retention;
27import java.util.HashMap;
28import java.util.Map;
29
30/**
31 * A simple scope that can be explicitly reset.
32 *
33 * @author jmourits@google.com (Jerome Mourits)
34 */
35class TestScope implements Scope {
36
37  @Retention(RUNTIME) @ScopeAnnotation
38  public @interface Scoped { }
39
40  private Map<Key, Object> inScopeObjectsMap = new HashMap<Key, Object>();
41
42  public <T> Provider<T> scope(
43      final Key<T> key, final Provider<T> provider) {
44    return new Provider<T>() {
45      @SuppressWarnings({"unchecked"})
46      public T get() {
47        T t = (T) inScopeObjectsMap.get(key);
48        if (t == null) {
49          t = provider.get();
50          inScopeObjectsMap.put(key, t);
51        }
52        return t;
53      }
54    };
55  }
56
57  public void beginNewScope() {
58    inScopeObjectsMap = new HashMap<Key, Object>();
59  }
60}
61