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1   /*
2    * Copyright 2004-2009 the Seasar Foundation and the Others.
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,
13   * either express or implied. See the License for the specific language
14   * governing permissions and limitations under the License.
15   */
16  package org.seasar.cubby.plugins.guice.spi;
17  
18  import org.seasar.cubby.spi.ContainerProvider;
19  import org.seasar.cubby.spi.container.Container;
20  import org.seasar.cubby.spi.container.LookupException;
21  
22  import com.google.inject.ConfigurationException;
23  import com.google.inject.Inject;
24  import com.google.inject.Injector;
25  
26  /**
27   * Guice の {@link Injector} による {@link Container} の実装を提供します。
28   * 
29   * @author baba
30   */
31  public class GuiceContainerProvider implements ContainerProvider {
32  
33  	/** {@link Container} */
34  	private final Container container;
35  
36  	/**
37  	 * インスタンス化します。
38  	 * 
39  	 * @param injector
40  	 *            インジェクタ
41  	 */
42  	@Inject
43  	public GuiceContainerProvider(final Injector injector) {
44  		this.container = new GuiceContainerImpl(injector);
45  	}
46  
47  	/**
48  	 * {@inheritDoc}
49  	 */
50  	public Container getContainer() {
51  		return container;
52  	}
53  
54  	/**
55  	 * {@link Injector} による {@link Container} の実装です。
56  	 * 
57  	 * @author baba
58  	 */
59  	private static class GuiceContainerImpl implements Container {
60  
61  		/** インスタンスをルックアップするための {@link Injector} */
62  		private final Injector injector;
63  
64  		/**
65  		 * インスタンス化します。
66  		 * 
67  		 * @param injector
68  		 *            インスタンスをルックアップするための {@link Injector}
69  		 */
70  		public GuiceContainerImpl(final Injector injector) {
71  			this.injector = injector;
72  		}
73  
74  		/**
75  		 * {@inheritDoc}
76  		 */
77  		public <T> T lookup(final Class<T> type) throws LookupException {
78  			try {
79  				return injector.getInstance(type);
80  			} catch (final ConfigurationException e) {
81  				throw new LookupException(e);
82  			}
83  		}
84  
85  	}
86  
87  }