Binding


1   /**
2    * Copyright (C) 2006 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  
17  package com.google.inject;
18  
19  /**
20   * A mapping from a key (type and optional annotation) to a provider of
21   * instances of that type.  This interface is part of the {@link Injector}
22   * introspection API and is intended primary for use by tools.
23   *
24   * @author crazybob@google.com (Bob Lee)
25   */
26  public interface Binding<T> {
27  
28    /**
29     * Returns the key for this binding.
30     */
31    Key<T> getKey();
32  
33    /**
34     * Returns an arbitrary object containing information about the "place"
35     * where this binding was configured. Used by Guice in the production of
36     * descriptive error messages.
37     */
38    Object   getSource();
39  
40    /**
41     * Returns the provider guice uses to fulfill requests for this binding.
42     */
43    Provider<T> getProvider();
44  }
45

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