1 | /* |
2 | * Copyright 2006-2007 the original author or authors. |
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 org.springframework.batch.core.configuration.support; |
18 | |
19 | import org.springframework.beans.BeansException; |
20 | import org.springframework.context.ApplicationContext; |
21 | import org.springframework.context.ApplicationContextAware; |
22 | import org.springframework.context.ConfigurableApplicationContext; |
23 | import org.springframework.context.support.AbstractXmlApplicationContext; |
24 | import org.springframework.core.io.Resource; |
25 | import org.springframework.util.Assert; |
26 | |
27 | /** |
28 | * {@link ApplicationContextFactory} implementation that takes a parent context and a path |
29 | * to the context to create. Each time the createApplicationContext method is called, a new |
30 | * {@link ApplicationContext} will be returned. It should be noted that if a path isn't |
31 | * set, the parent will always be returned. |
32 | * |
33 | */ |
34 | public class ClassPathXmlApplicationContextFactory implements ApplicationContextFactory, ApplicationContextAware { |
35 | |
36 | private ConfigurableApplicationContext parent; |
37 | |
38 | private Resource path; |
39 | |
40 | /** |
41 | * Setter for the path to the xml to load to create an |
42 | * {@link ApplicationContext}. Use imports to centralise the configuration in |
43 | * one file. |
44 | * |
45 | * @param path the resource path to the xml to load for the child context. |
46 | */ |
47 | public void setPath(Resource path) { |
48 | this.path = path; |
49 | } |
50 | |
51 | /** |
52 | * Setter for the parent application context. |
53 | * |
54 | * @see org.springframework.context.ApplicationContextAware#setApplicationContext(org.springframework.context.ApplicationContext) |
55 | */ |
56 | public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { |
57 | Assert.isInstanceOf(ConfigurableApplicationContext.class, applicationContext); |
58 | parent = (ConfigurableApplicationContext) applicationContext; |
59 | } |
60 | |
61 | /** |
62 | * Creates an {@link ApplicationContext} from the provided path. |
63 | * |
64 | * @see ApplicationContextFactory#createApplicationContext() |
65 | */ |
66 | public ConfigurableApplicationContext createApplicationContext() { |
67 | if (path == null) { |
68 | return parent; |
69 | } |
70 | return new ResourceXmlApplicationContext(parent); |
71 | } |
72 | |
73 | /** |
74 | * @author Dave Syer |
75 | * |
76 | */ |
77 | private final class ResourceXmlApplicationContext extends AbstractXmlApplicationContext { |
78 | /** |
79 | * @param parent |
80 | */ |
81 | private ResourceXmlApplicationContext(ApplicationContext parent) { |
82 | super(parent); |
83 | refresh(); |
84 | } |
85 | |
86 | protected Resource[] getConfigResources() { |
87 | return new Resource[] {path}; |
88 | } |
89 | } |
90 | |
91 | } |