1 /*
2 * Copyright 2007-2008 Naoki NOSE.
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 package jp.liq.container.component;
17
18 import jp.liq.container.Component;
19 import jp.liq.container.Resolver;
20
21 /**
22 * 自分のクラスのサブクラスのインスタンスを取得して返すコンポーネントです。
23 * @author nosen
24 */
25 public class MappingComponent<T> implements Component<T> {
26
27 private Class<?> subtype;
28 private Class<T> type;
29
30 /**
31 * このクラスのインスタンスを構築します。
32 * @param type このコンポーネントによってインスタンスを生成されるクラスです。
33 * @param subtype 引数 type のサブクラスです。
34 */
35 public MappingComponent(Class<T> type, Class<?> subtype) {
36 this.type = type;
37 this.subtype = subtype;
38 }
39
40 /**
41 * @see jp.liq.container.Component#getDescription()
42 */
43 public Object getDescription() {
44 return "{" + type + "=>" + subtype + "}";
45 }
46
47 /**
48 * @see jp.liq.container.Component#getInstance(jp.liq.container.Resolver)
49 */
50 public T getInstance(Resolver resolver) {
51 return type.cast(resolver.resolve(subtype));
52 }
53
54 /**
55 * @see jp.liq.container.Component#getType()
56 */
57 public Class<T> getType() {
58 return type;
59 }
60
61 }