Source Code Cross Referenced for AbstractXmlApplicationContext.java in  » J2EE » spring-framework-2.0.6 » org » springframework » context » support » 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.support 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2007 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.context.support;
018:
019:        import java.io.IOException;
020:
021:        import org.springframework.beans.BeansException;
022:        import org.springframework.beans.factory.support.DefaultListableBeanFactory;
023:        import org.springframework.beans.factory.xml.ResourceEntityResolver;
024:        import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
025:        import org.springframework.context.ApplicationContext;
026:        import org.springframework.core.io.Resource;
027:
028:        /**
029:         * Convenient base class for {@link org.springframework.context.ApplicationContext}
030:         * implementations, drawing configuration from XML documents containing bean definitions
031:         * understood by an {@link org.springframework.beans.factory.xml.XmlBeanDefinitionReader}.
032:         *
033:         * <p>Subclasses just have to implement the {@link #getConfigResources} and/or
034:         * the {@link #getConfigLocations} method. Furthermore, they might override
035:         * the {@link #getResourceByPath} hook to interpret relative paths in an
036:         * environment-specific fashion, and/or {@link #getResourcePatternResolver}
037:         * for extended pattern resolution.
038:         *
039:         * @author Rod Johnson
040:         * @author Juergen Hoeller
041:         * @see #getConfigResources
042:         * @see #getConfigLocations
043:         * @see org.springframework.beans.factory.xml.XmlBeanDefinitionReader
044:         */
045:        public abstract class AbstractXmlApplicationContext extends
046:                AbstractRefreshableApplicationContext {
047:
048:            /**
049:             * Create a new AbstractXmlApplicationContext with no parent.
050:             */
051:            public AbstractXmlApplicationContext() {
052:            }
053:
054:            /**
055:             * Create a new AbstractXmlApplicationContext with the given parent context.
056:             * @param parent the parent context
057:             */
058:            public AbstractXmlApplicationContext(ApplicationContext parent) {
059:                super (parent);
060:            }
061:
062:            /**
063:             * Loads the bean definitions via an XmlBeanDefinitionReader.
064:             * @see org.springframework.beans.factory.xml.XmlBeanDefinitionReader
065:             * @see #initBeanDefinitionReader
066:             * @see #loadBeanDefinitions
067:             */
068:            protected void loadBeanDefinitions(
069:                    DefaultListableBeanFactory beanFactory) throws IOException {
070:                // Create a new XmlBeanDefinitionReader for the given BeanFactory.
071:                XmlBeanDefinitionReader beanDefinitionReader = new XmlBeanDefinitionReader(
072:                        beanFactory);
073:
074:                // Configure the bean definition reader with this context's
075:                // resource loading environment.
076:                beanDefinitionReader.setResourceLoader(this );
077:                beanDefinitionReader
078:                        .setEntityResolver(new ResourceEntityResolver(this ));
079:
080:                // Allow a subclass to provide custom initialization of the reader,
081:                // then proceed with actually loading the bean definitions.
082:                initBeanDefinitionReader(beanDefinitionReader);
083:                loadBeanDefinitions(beanDefinitionReader);
084:            }
085:
086:            /**
087:             * Initialize the bean definition reader used for loading the bean
088:             * definitions of this context. Default implementation is empty.
089:             * <p>Can be overridden in subclasses, e.g. for turning off XML validation
090:             * or using a different XmlBeanDefinitionParser implementation.
091:             * @param beanDefinitionReader the bean definition reader used by this context
092:             * @see org.springframework.beans.factory.xml.XmlBeanDefinitionReader#setDocumentReaderClass
093:             */
094:            protected void initBeanDefinitionReader(
095:                    XmlBeanDefinitionReader beanDefinitionReader) {
096:            }
097:
098:            /**
099:             * Load the bean definitions with the given XmlBeanDefinitionReader.
100:             * <p>The lifecycle of the bean factory is handled by the {@link #refreshBeanFactory}
101:             * method; hence this method is just supposed to load and/or register bean definitions.
102:             * @param reader the XmlBeanDefinitionReader to use
103:             * @throws BeansException in case of bean registration errors
104:             * @throws IOException if the required XML document isn't found
105:             * @see #refreshBeanFactory
106:             * @see #getConfigLocations
107:             * @see #getResources
108:             * @see #getResourcePatternResolver
109:             */
110:            protected void loadBeanDefinitions(XmlBeanDefinitionReader reader)
111:                    throws BeansException, IOException {
112:                Resource[] configResources = getConfigResources();
113:                if (configResources != null) {
114:                    reader.loadBeanDefinitions(configResources);
115:                }
116:                String[] configLocations = getConfigLocations();
117:                if (configLocations != null) {
118:                    reader.loadBeanDefinitions(configLocations);
119:                }
120:            }
121:
122:            /**
123:             * Return an array of Resource objects, referring to the XML bean definition
124:             * files that this context should be built with.
125:             * <p>The default implementation returns <code>null</code>. Subclasses can override
126:             * this to provide pre-built Resource objects rather than location Strings.
127:             * @return an array of Resource objects, or <code>null</code> if none
128:             * @see #getConfigLocations()
129:             */
130:            protected Resource[] getConfigResources() {
131:                return null;
132:            }
133:
134:            /**
135:             * Return an array of resource locations, referring to the XML bean definition
136:             * files that this context should be built with. Can also include location
137:             * patterns, which will get resolved via a ResourcePatternResolver.
138:             * <p>The default implementation returns <code>null</code>. Subclasses can override
139:             * this to provide a set of resource locations to load bean definitions from.
140:             * @return an array of resource locations, or <code>null</code> if none
141:             * @see #getResources
142:             * @see #getResourcePatternResolver
143:             */
144:            protected String[] getConfigLocations() {
145:                return null;
146:            }
147:
148:        }
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