core/src/main/java/com/opensymphony/xwork2/spring/SpringProxyableObjectFactory.java

/*
 * 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 com.opensymphony.xwork2.spring;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.context.ApplicationContext;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * SpringProxyableObjectFactory.
 *
 * @author Jason Carreira
 */
public class SpringProxyableObjectFactory extends SpringObjectFactory {
    
    private static final Logger LOG = LogManager.getLogger(SpringProxyableObjectFactory.class);

    private List<String> skipBeanNames = new ArrayList<>();

    public SpringProxyableObjectFactory() {
    }

    @Override
    public Object buildBean(String beanName, Map<String, Object> extraContext) throws Exception {
        LOG.debug("Building bean for name {}", beanName);
        if (!skipBeanNames.contains(beanName)) {
            ApplicationContext anAppContext = getApplicationContext(extraContext);
            try {
                LOG.debug("Trying the application context... appContext = {},\n bean name = {}", anAppContext, beanName);
                return anAppContext.getBean(beanName);
            } catch (NoSuchBeanDefinitionException e) {
                LOG.debug("Did not find bean definition for bean named {}, creating a new one...", beanName);
                if (autoWiringFactory instanceof BeanDefinitionRegistry) {
                    try {
                        Class clazz = Class.forName(beanName);
                        BeanDefinitionRegistry registry = (BeanDefinitionRegistry) autoWiringFactory;
                        RootBeanDefinition def = new RootBeanDefinition(clazz, autowireStrategy, true);
                        def.setScope(BeanDefinition.SCOPE_SINGLETON);
                        LOG.debug("Registering a new bean definition for class {}", beanName);
                        registry.registerBeanDefinition(beanName,def);
                        try {
                            return anAppContext.getBean(beanName);
                        } catch (NoSuchBeanDefinitionException e2) {
                            LOG.warn("Could not register new bean definition for bean {}", beanName);
                            skipBeanNames.add(beanName);
                        }
                    } catch (ClassNotFoundException e1) {
                        skipBeanNames.add(beanName);
                    }
                }
            }
        }
        LOG.debug("Returning autowired instance created by default ObjectFactory");
        return autoWireBean(super.buildBean(beanName, extraContext), autoWiringFactory);
    }

    /**
     * Subclasses may override this to return a different application context.
     * Note that this application context should see any changes made to the
     * <code>autoWiringFactory</code>, so the application context should be either
     * the original or a child context of the original.
     *
     * @param context provided context.
     * @return the application context
     */
    protected ApplicationContext getApplicationContext(Map<String, Object> context) {
        return appContext;
    }
}