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Java > Open Source Codes > org > springframework > beans > factory > xml > XmlBeanFactory


1 /*
2  * Copyright 2002-2006 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.beans.factory.xml;
18
19 import org.springframework.beans.BeansException;
20 import org.springframework.beans.factory.BeanFactory;
21 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
22 import org.springframework.core.io.Resource;
23
24 /**
25  * Convenience extension of DefaultListableBeanFactory that reads bean definitions
26  * from an XML document. Delegates to XmlBeanDefinitionReader underneath; effectively
27  * equivalent to using an XmlBeanDefinitionReader with a DefaultListableBeanFactory.
28  *
29  * <p>The structure, element and attribute names of the required XML document
30  * are hard-coded in this class. (Of course a transform could be run if necessary
31  * to produce this format). "beans" doesn't need to be the root element of the XML
32  * document: This class will parse all bean definition elements in the XML file.
33  *
34  * <p>This class registers each bean definition with the DefaultListableBeanFactory
35  * superclass, and relies on the latter's implementation of the BeanFactory interface.
36  * It supports singletons, prototypes, and references to either of these kinds of bean.
37  * See "spring-beans_2_0.dtd" for details on options and configuration style.
38  *
39  * <p><b>For advanced needs, consider using a DefaultListableBeanFactory with
40  * an XmlBeanDefinitionReader.</b> The latter allows for reading from multiple XML
41  * resources and is highly configurable in its actual XML parsing behavior.
42  *
43  * @author Rod Johnson
44  * @author Juergen Hoeller
45  * @since 15 April 2001
46  * @see org.springframework.beans.factory.support.DefaultListableBeanFactory
47  * @see XmlBeanDefinitionReader
48  */
49 public class XmlBeanFactory extends DefaultListableBeanFactory {
50
51     private final XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(this);
52
53
54     /**
55      * Create a new XmlBeanFactory with the given resource,
56      * which must be parsable using DOM.
57      * @param resource XML resource to load bean definitions from
58      * @throws BeansException in case of loading or parsing errors
59      */
60     public XmlBeanFactory(Resource resource) throws BeansException {
61         this(resource, null);
62     }
63
64     /**
65      * Create a new XmlBeanFactory with the given input stream,
66      * which must be parsable using DOM.
67      * @param resource XML resource to load bean definitions from
68      * @param parentBeanFactory parent bean factory
69      * @throws BeansException in case of loading or parsing errors
70      */
71     public XmlBeanFactory(Resource resource, BeanFactory parentBeanFactory) throws BeansException {
72         super(parentBeanFactory);
73         this.reader.loadBeanDefinitions(resource);
74     }
75
76 }
77
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