beandefinitionreader.java

一个关于Spring框架的示例应用程序,简单使用,可以参考.

/*
 * Copyright 2002-2004 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.beans.factory.support;

import org.springframework.beans.BeansException;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;

/**
 * Simple interface for bean definition readers.
 * Specifies load methods with Resource parameters.
 *
 * <p>Concrete bean definition readers can of course add additional
 * load and register methods for bean definitions, specific to
 * their bean definition format.
 *
 * <p>Note that a bean definition reader does not have to implement
 * this interface. It only serves as suggestion for bean definition
 * readers that want to follow standard naming conventions.
 *
 * @author Juergen Hoeller
 * @since 1.1
 * @see org.springframework.core.io.Resource
 */
public interface BeanDefinitionReader {

	/**
	 * Return the bean factory to register the bean definitions with.
	 */
	BeanDefinitionRegistry getBeanFactory();

	/**
	 * Return the class loader to use for bean classes.
	 * <p>Null suggests to not load bean classes but just register bean definitions
	 * with class names, for example when just registering beans in a registry
	 * but not actually instantiating them in a factory.
	 */
	ClassLoader getBeanClassLoader();

	/**
	 * Return the resource loader to use for resource locations.
	 * Can be checked for the <b>ResourcePatternResolver</b> interface and cast
	 * accordingly, for loading multiple resources for a given resource pattern.
	 * <p>Null suggests that absolute resource loading is not available
	 * for this bean definition reader.
	 * <p>This is mainly meant to be used for importing further resources
	 * from within a bean definition resource, for example via the "import"
	 * tag in XML bean definitions. It is recommended, however, to apply
	 * such imports relative to the defining resource; only explicit full
	 * resource locations will trigger absolute resource loading.
	 * @see org.springframework.core.io.support.ResourcePatternResolver
	 */
	ResourceLoader getResourceLoader();


	/**
	 * Load bean definitions from the specified resource.
	 * @param resource the resource descriptor
	 * @return the number of bean definitions found
	 * @throws BeansException in case of loading or parsing errors
	 */
	int loadBeanDefinitions(Resource resource) throws BeansException;

	/**
	 * Load bean definitions from the specified resources.
	 * @param resources the resource descriptors
	 * @return the number of bean definitions found
	 * @throws BeansException in case of loading or parsing errors
	 */
	int loadBeanDefinitions(Resource[] resources) throws BeansException;

}