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Spring Framework example source code file (AbstractBeanDefinitionReader.java)

This example Spring Framework source code file (AbstractBeanDefinitionReader.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

abstractbeandefinitionreader, beandefinitionregistry, beandefinitionregistry, beandefinitionstoreexception, beandefinitionstoreexception, beannamegenerator, classloader, defaultbeannamegenerator, io, loaded, resource, resource, resourceloader, resourceloader, resourcepatternresolver, util

The Spring Framework AbstractBeanDefinitionReader.java source code

/*
 * Copyright 2002-2007 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 java.io.IOException;
import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.beans.factory.BeanDefinitionStoreException;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.util.Assert;

/**
 * Abstract base class for bean definition readers which implement
 * the {@link BeanDefinitionReader} interface.
 *
 * <p>Provides common properties like the bean factory to work on
 * and the class loader to use for loading bean classes.
 *
 * @author Juergen Hoeller
 * @since 11.12.2003
 * @see BeanDefinitionReaderUtils
 */
public abstract class AbstractBeanDefinitionReader implements BeanDefinitionReader {

	/** Logger available to subclasses */
	protected final Log logger = LogFactory.getLog(getClass());

	private final BeanDefinitionRegistry registry;

	private ResourceLoader resourceLoader;

	private ClassLoader beanClassLoader;

	private BeanNameGenerator beanNameGenerator = new DefaultBeanNameGenerator();


	/**
	 * Create a new AbstractBeanDefinitionReader for the given bean factory.
	 * <p>If the passed-in bean factory does not only implement the BeanDefinitionRegistry
	 * interface but also the ResourceLoader interface, it will be used as default
	 * ResourceLoader as well. This will usually be the case for
	 * {@link org.springframework.context.ApplicationContext} implementations.
	 * <p>If given a plain BeanDefinitionRegistry, the default ResourceLoader will be a
	 * {@link org.springframework.core.io.support.PathMatchingResourcePatternResolver}.
	 * @param registry the BeanFactory to load bean definitions into,
	 * in the form of a BeanDefinitionRegistry
	 * @see #setResourceLoader
	 */
	protected AbstractBeanDefinitionReader(BeanDefinitionRegistry registry) {
		Assert.notNull(registry, "BeanDefinitionRegistry must not be null");
		this.registry = registry;

		// Determine ResourceLoader to use.
		if (this.registry instanceof ResourceLoader) {
			this.resourceLoader = (ResourceLoader) this.registry;
		}
		else {
			this.resourceLoader = new PathMatchingResourcePatternResolver();
		}
	}


	public final BeanDefinitionRegistry getBeanFactory() {
		return this.registry;
	}

	public final BeanDefinitionRegistry getRegistry() {
		return this.registry;
	}

	/**
	 * Set the ResourceLoader to use for resource locations.
	 * If specifying a ResourcePatternResolver, the bean definition reader
	 * will be capable of resolving resource patterns to Resource arrays.
	 * <p>Default is PathMatchingResourcePatternResolver, also capable of
	 * resource pattern resolving through the ResourcePatternResolver interface.
	 * <p>Setting this to null suggests that absolute resource loading
	 * is not available for this bean definition reader.
	 * @see org.springframework.core.io.support.ResourcePatternResolver
	 * @see org.springframework.core.io.support.PathMatchingResourcePatternResolver
	 */
	public void setResourceLoader(ResourceLoader resourceLoader) {
		this.resourceLoader = resourceLoader;
	}

	public ResourceLoader getResourceLoader() {
		return this.resourceLoader;
	}

	/**
	 * Set the ClassLoader to use for bean classes.
	 * <p>Default is null, which suggests to not load bean classes
	 * eagerly but rather to just register bean definitions with class names,
	 * with the corresponding Classes to be resolved later (or never).
	 * @see java.lang.Thread#getContextClassLoader()
	 */
	public void setBeanClassLoader(ClassLoader beanClassLoader) {
		this.beanClassLoader = beanClassLoader;
	}

	public ClassLoader getBeanClassLoader() {
		return this.beanClassLoader;
	}

	/**
	 * Set the BeanNameGenerator to use for anonymous beans
	 * (without explicit bean name specified).
	 * <p>Default is a {@link DefaultBeanNameGenerator}.
	 */
	public void setBeanNameGenerator(BeanNameGenerator beanNameGenerator) {
		this.beanNameGenerator = (beanNameGenerator != null ? beanNameGenerator : new DefaultBeanNameGenerator());
	}

	public BeanNameGenerator getBeanNameGenerator() {
		return this.beanNameGenerator;
	}


	public int loadBeanDefinitions(Resource[] resources) throws BeanDefinitionStoreException {
		Assert.notNull(resources, "Resource array must not be null");
		int counter = 0;
		for (int i = 0; i < resources.length; i++) {
			counter += loadBeanDefinitions(resources[i]);
		}
		return counter;
	}

	public int loadBeanDefinitions(String location) throws BeanDefinitionStoreException {
		return loadBeanDefinitions(location, null);
	}

	/**
	 * Load bean definitions from the specified resource location.
	 * <p>The location can also be a location pattern, provided that the
	 * ResourceLoader of this bean definition reader is a ResourcePatternResolver.
	 * @param location the resource location, to be loaded with the ResourceLoader
	 * (or ResourcePatternResolver) of this bean definition reader
	 * @param actualResources a Set to be filled with the actual Resource objects
	 * that have been resolved during the loading process. May be <code>null
	 * to indicate that the caller is not interested in those Resource objects.
	 * @return the number of bean definitions found
	 * @throws BeanDefinitionStoreException in case of loading or parsing errors
	 * @see #getResourceLoader()
	 * @see #loadBeanDefinitions(org.springframework.core.io.Resource)
	 * @see #loadBeanDefinitions(org.springframework.core.io.Resource[])
	 */
	public int loadBeanDefinitions(String location, Set actualResources) throws BeanDefinitionStoreException {
		ResourceLoader resourceLoader = getResourceLoader();
		if (resourceLoader == null) {
			throw new BeanDefinitionStoreException(
					"Cannot import bean definitions from location [" + location + "]: no ResourceLoader available");
		}

		if (resourceLoader instanceof ResourcePatternResolver) {
			// Resource pattern matching available.
			try {
				Resource[] resources = ((ResourcePatternResolver) resourceLoader).getResources(location);
				int loadCount = loadBeanDefinitions(resources);
				if (actualResources != null) {
					for (int i = 0; i < resources.length; i++) {
						actualResources.add(resources[i]);
					}
				}
				if (logger.isDebugEnabled()) {
					logger.debug("Loaded " + loadCount + " bean definitions from location pattern [" + location + "]");
				}
				return loadCount;
			}
			catch (IOException ex) {
				throw new BeanDefinitionStoreException(
						"Could not resolve bean definition resource pattern [" + location + "]", ex);
			}
		}
		else {
			// Can only load single resources by absolute URL.
			Resource resource = resourceLoader.getResource(location);
			int loadCount = loadBeanDefinitions(resource);
			if (actualResources != null) {
				actualResources.add(resource);
			}
			if (logger.isDebugEnabled()) {
				logger.debug("Loaded " + loadCount + " bean definitions from location [" + location + "]");
			}
			return loadCount;
		}
	}

	public int loadBeanDefinitions(String[] locations) throws BeanDefinitionStoreException {
		Assert.notNull(locations, "Location array must not be null");
		int counter = 0;
		for (int i = 0; i < locations.length; i++) {
			counter += loadBeanDefinitions(locations[i]);
		}
		return counter;
	}

}

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