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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.xbean.spring.context;

import java.io.IOException;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.apache.xbean.spring.context.impl.XBeanHelper;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.xml.ResourceEntityResolver;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.AbstractXmlApplicationContext;
import org.springframework.core.io.Resource;

/**
 * An XBean version of a regular Spring ApplicationContext which takes a
 * {@link Resource} as a parameter to load the application context
 * 
 * @author James Strachan
 * @author Dain Sundstrom
 * @version $Id$
 * @since 2.0
 */
public class ResourceXmlApplicationContext extends AbstractXmlApplicationContext implements SpringApplicationContext {
    private final List xmlPreprocessors;
    private final Resource resource;

    /**
     * Creates a ResourceXmlApplicationContext which loads the configuration from the specified Resource.
     * @param resource the resource from which the configuration is loaded
     */
    public ResourceXmlApplicationContext(Resource resource) {
        this(resource, Collections.EMPTY_LIST);
    }
  
    /**
     * Creates a ResourceXmlApplicationContext which loads the configuration from the specified Resource.
     * @param resource the resource from which the configuration is loaded
     * @param xmlPreprocessors the SpringXmlPreprocessors to apply before passing the xml to Spring for processing
     */
    public ResourceXmlApplicationContext(Resource resource, List xmlPreprocessors) {
        super();
        this.xmlPreprocessors = xmlPreprocessors;
        this.resource = resource;
        refresh();
    }

    public ResourceXmlApplicationContext(Resource resource, ApplicationContext parent) {
        this(resource, Collections.EMPTY_LIST, parent);
    }

    public ResourceXmlApplicationContext(Resource resource,  List xmlPreprocessors, ApplicationContext parent) {
        this(resource, xmlPreprocessors, parent, Collections.EMPTY_LIST);
    }
    
    public ResourceXmlApplicationContext(Resource resource,  List xmlPreprocessors, ApplicationContext parent, List beanPostProcessors) {
        this(resource, xmlPreprocessors, parent, beanPostProcessors, true);
    }

    public ResourceXmlApplicationContext(Resource resource,  List xmlPreprocessors, ApplicationContext parent, List beanPostProcessors, boolean refresh) {
        super(parent);
        this.xmlPreprocessors = xmlPreprocessors;
        this.resource = resource;
        for (Iterator iter = beanPostProcessors.iterator(); iter.hasNext();) {
            BeanFactoryPostProcessor processor =  (BeanFactoryPostProcessor) iter.next();
            addBeanFactoryPostProcessor(processor);
        }
        if (refresh) {
            refresh();
        }
    }

    protected void loadBeanDefinitions(DefaultListableBeanFactory beanFactory) throws IOException {
        // Create a new XmlBeanDefinitionReader for the given BeanFactory.
        XmlBeanDefinitionReader beanDefinitionReader = XBeanHelper.createBeanDefinitionReader(this, beanFactory, xmlPreprocessors);

        // 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);
    }
    
    /**
     * {@inheritDoc}
     */
    protected void loadBeanDefinitions(XmlBeanDefinitionReader reader) throws BeansException, IOException {
        reader.loadBeanDefinitions(resource);
    }

    /**
     * {@inheritDoc}
     */
    protected String[] getConfigLocations() {
        return null;
    }
}