Source Code Cross Referenced for ResourceLoaderAware.java in  » J2EE » spring-framework-2.0.6 » org » springframework » context » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.context 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Copyright 2002-2006 the original author or authors.
03:         *
04:         * Licensed under the Apache License, Version 2.0 (the "License");
05:         * you may not use this file except in compliance with the License.
06:         * You may obtain a copy of the License at
07:         *
08:         *      http://www.apache.org/licenses/LICENSE-2.0
09:         *
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.context;
18:
19:        import org.springframework.core.io.ResourceLoader;
20:
21:        /**
22:         * Interface to be implemented by any object that wishes to be notified of
23:         * the <b>ResourceLoader</b> (typically the ApplicationContext) that it runs in.
24:         * This is an alternative to a full ApplicationContext dependency via the
25:         * ApplicationContextAware interface.
26:         *
27:         * <p>Note that Resource dependencies can also be exposed as bean properties
28:         * of type Resource, populated via Strings with automatic type conversion by
29:         * the bean factory. This removes the need for implementing any callback
30:         * interface just for the purpose of accessing a specific file resource.
31:         *
32:         * <p>You typically need a ResourceLoader when your application object has
33:         * to access a variety of file resources whose names are calculated. A good
34:         * strategy is to make the object use a DefaultResourceLoader but still
35:         * implement ResourceLoaderAware to allow for overriding when running in an
36:         * ApplicationContext. See ReloadableResourceBundleMessageSource for an example.
37:         *
38:         * <p>A passed-in ResourceLoader can also be checked for the
39:         * <b>ResourcePatternResolver</b> interface and cast accordingly, to be able
40:         * to resolve resource patterns into arrays of Resource objects. This will always
41:         * work when running in an ApplicationContext (the context interface extends
42:         * ResourcePatternResolver). Use a PathMatchingResourcePatternResolver as default.
43:         * See also the <code>ResourcePatternUtils.getResourcePatternResolver</code> method.
44:         *
45:         * <p>As alternative to a ResourcePatternResolver dependency, consider exposing
46:         * bean properties of type Resource array, populated via pattern Strings with
47:         * automatic type conversion by the bean factory.
48:         * 
49:         * @author Juergen Hoeller
50:         * @since 10.03.2004
51:         * @see ApplicationContextAware
52:         * @see org.springframework.beans.factory.InitializingBean
53:         * @see org.springframework.core.io.Resource
54:         * @see org.springframework.core.io.support.ResourcePatternResolver
55:         * @see org.springframework.core.io.support.ResourcePatternUtils#getResourcePatternResolver
56:         * @see org.springframework.core.io.DefaultResourceLoader
57:         * @see org.springframework.core.io.support.PathMatchingResourcePatternResolver
58:         * @see org.springframework.context.support.ReloadableResourceBundleMessageSource
59:         */
60:        public interface ResourceLoaderAware {
61:
62:            /**
63:             * Set the ResourceLoader that this object runs in.
64:             * <p>This might be a ResourcePatternResolver, which can be checked
65:             * through <code>instanceof ResourcePatternResolver</code>. See also the
66:             * <code>ResourcePatternUtils.getResourcePatternResolver</code> method.
67:             * <p>Invoked after population of normal bean properties but before an init callback
68:             * like InitializingBean's <code>afterPropertiesSet</code> or a custom init-method.
69:             * Invoked before ApplicationContextAware's <code>setApplicationContext</code>.
70:             * @param resourceLoader ResourceLoader object to be used by this object
71:             * @see org.springframework.core.io.support.ResourcePatternResolver
72:             * @see org.springframework.core.io.support.ResourcePatternUtils#getResourcePatternResolver
73:             */
74:            void setResourceLoader(ResourceLoader resourceLoader);
75:
76:        }
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