/*
 * 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.web.portlet.context;

import java.io.IOException;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.xml.ResourceEntityResolver;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;

/**
 * Portlet-based {@link org.springframework.web.context.WebApplicationContext}
 * implementation which takes its configuration from XML documents, understood
 * by an {@link org.springframework.beans.factory.xml.XmlBeanDefinitionReader}.
 * This is essentially the equivalent of
 * {@link org.springframework.context.support.AbstractXmlApplicationContext}
 * for a portlet environment.
 *
 * <p>By default, the configuration will be taken from "/WEB-INF/applicationContext.xml"
 * for the root context, and "/WEB-INF/test-portlet.xml" for a context with the namespace
 * "test-portlet" (like for a DispatcherPortlet instance with the portlet-name "test").
 *
 * <p>The config location defaults can be overridden via the "contextConfigLocation"
 * portlet init-param of {@link org.springframework.web.portlet.FrameworkPortlet}.
 * Config locations can either denote concrete files like "/WEB-INF/context.xml"
 * or Ant-style patterns like "/WEB-INF/*-context.xml" (see
 * {@link org.springframework.util.PathMatcher} javadoc for pattern details).
 *
 * <p>Note: In case of multiple config locations, later bean definitions will
 * override ones defined in earlier loaded files. This can be leveraged to
 * deliberately override certain bean definitions via an extra XML file.
 *
 * <p><b>For a Portlet-based context that reads in a different bean definition format,
 * create an analogous subclass of {@link AbstractRefreshablePortletApplicationContext}.</b>
 * Such a context implementation can be specified as "contextClass" init-param
 * for a FrameworkPortlet instance.
 *
 * @author Juergen Hoeller
 * @author John A. Lewis
 * @since 2.0
 * @see #setNamespace
 * @see #setConfigLocations
 * @see org.springframework.beans.factory.xml.XmlBeanDefinitionReader
 * @see org.springframework.web.portlet.FrameworkPortlet#initPortletApplicationContext
 */
public class XmlPortletApplicationContext extends AbstractRefreshablePortletApplicationContext {

	/** Default config location for the root context */
	public static final String DEFAULT_CONFIG_LOCATION = "/WEB-INF/applicationContext.xml";

	/** Default prefix for building a config location for a namespace */
	public static final String DEFAULT_CONFIG_LOCATION_PREFIX = "/WEB-INF/";

	/** Default suffix for building a config location for a namespace */
	public static final String DEFAULT_CONFIG_LOCATION_SUFFIX = ".xml";


	/**
	 * Loads the bean definitions via an XmlBeanDefinitionReader.
	 * @see org.springframework.beans.factory.xml.XmlBeanDefinitionReader
	 * @see #initBeanDefinitionReader
	 * @see #loadBeanDefinitions
	 */
	protected void loadBeanDefinitions(DefaultListableBeanFactory beanFactory) throws IOException {
		// Create a new XmlBeanDefinitionReader for the given BeanFactory.
		XmlBeanDefinitionReader beanDefinitionReader = new XmlBeanDefinitionReader(beanFactory);

		// Configure the bean definition reader with this context's
		// resource loading environment.
		beanDefinitionReader.setResourceLoader(this);
		beanDefinitionReader.setEntityResolver(new ResourceEntityResolver(this));

		// Allow a subclass to provide custom initialization of the reader,
		// then proceed with actually loading the bean definitions.
		initBeanDefinitionReader(beanDefinitionReader);
		loadBeanDefinitions(beanDefinitionReader);
	}

	/**
	 * Initialize the bean definition reader used for loading the bean
	 * definitions of this context. Default implementation is empty.
	 * <p>Can be overridden in subclasses, e.g. for turning off XML validation
	 * or using a different XmlBeanDefinitionParser implementation.
	 * @param beanDefinitionReader the bean definition reader used by this context
	 * @see org.springframework.beans.factory.xml.XmlBeanDefinitionReader#setValidationMode
	 * @see org.springframework.beans.factory.xml.XmlBeanDefinitionReader#setDocumentReaderClass
	 */
	protected void initBeanDefinitionReader(XmlBeanDefinitionReader beanDefinitionReader) {
	}

	/**
	 * Load the bean definitions with the given XmlBeanDefinitionReader.
	 * <p>The lifecycle of the bean factory is handled by the refreshBeanFactory method;
	 * therefore this method is just supposed to load and/or register bean definitions.
	 * <p>Delegates to a ResourcePatternResolver for resolving location patterns
	 * into Resource instances.
	 * @throws org.springframework.beans.BeansException in case of bean registration errors
	 * @throws java.io.IOException if the required XML document isn't found
	 * @see #refreshBeanFactory
	 * @see #getConfigLocations
	 * @see #getResources
	 * @see #getResourcePatternResolver
	 */
	protected void loadBeanDefinitions(XmlBeanDefinitionReader reader) throws BeansException, IOException {
		String[] configLocations = getConfigLocations();
		if (configLocations != null) {
			for (int i = 0; i < configLocations.length; i++) {
				reader.loadBeanDefinitions(configLocations[i]);
			}
		}
	}

	/**
	 * The default location for the root context is "/WEB-INF/applicationContext.xml",
	 * and "/WEB-INF/test-portlet.xml" for a context with the namespace "test-portlet"
	 * (like for a DispatcherPortlet instance with the portlet-name "test").
	 */
	protected String[] getDefaultConfigLocations() {
		if (getNamespace() != null) {
			return new String[] {DEFAULT_CONFIG_LOCATION_PREFIX + getNamespace() + DEFAULT_CONFIG_LOCATION_SUFFIX};
		}
		else {
			return new String[] {DEFAULT_CONFIG_LOCATION};
		}
	}

}
