/*
* Copyright 2005 Joe Walker
*
* 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.directwebremoting.spring;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.directwebremoting.ServerContextFactory;
import org.directwebremoting.WebContextFactory;
import org.directwebremoting.extend.AbstractCreator;
import org.directwebremoting.extend.Creator;
import org.directwebremoting.util.LocalUtil;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import org.springframework.web.servlet.support.RequestContextUtils;
/**
* A creator that relies on a spring bean factory.
* @author Joe Walker [joe at getahead dot ltd dot uk]
*/
public class SpringCreator extends AbstractCreator implements Creator
{
/**
* @return Returns the beanName.
*/
public String getBeanName()
{
return beanName;
}
/**
* @param beanName The beanName to set.
*/
public void setBeanName(String beanName)
{
this.beanName = beanName;
}
/**
* What sort of class do we create?
* @param classname The name of the class
*/
public void setClass(String classname)
{
try
{
this.clazz = LocalUtil.classForName(classname);
}
catch (ClassNotFoundException ex)
{
throw new IllegalArgumentException("Class not found: " + classname, ex);
}
}
/* (non-Javadoc)
* @see org.directwebremoting.create.Creator#init(org.w3c.dom.Element)
*/
@Override
public void setProperties(Map<String, String> params) throws IllegalArgumentException
{
List<String> locValues = new ArrayList<String>();
for (Map.Entry<String, String> entry : params.entrySet())
{
String key = entry.getKey();
String value = entry.getValue();
if (key.startsWith("location"))
{
log.debug("Adding configLocation: " + value + " from parameter: " + key);
locValues.add(value);
}
}
configLocation = locValues.toArray(new String[locValues.size()]);
}
/* (non-Javadoc)
* @see org.directwebremoting.Creator#getType()
*/
public Class<?> getType()
{
if (clazz == null)
{
try
{
clazz = getInstance().getClass();
}
catch (InstantiationException ex)
{
log.error("Failed to instansiate object to detect type.", ex);
return Object.class;
}
}
return clazz;
}
/* (non-Javadoc)
* @see org.directwebremoting.Creator#getInstance()
*/
public Object getInstance() throws InstantiationException
{
try
{
if (overrideFactory != null)
{
return overrideFactory.getBean(beanName);
}
if (factory == null)
{
factory = getBeanFactory();
}
if (factory == null)
{
log.error("DWR can't find a spring config. See following info logs for solutions");
log.info("- Option 1. In dwr.xml, <create creator='spring' ...> add <param name='location1' value='beans.xml'/> for each spring config file.");
log.info("- Option 2. Use a spring org.springframework.web.context.ContextLoaderListener.");
log.info("- Option 3. Call SpringCreator.setOverrideBeanFactory() from your web-app");
throw new InstantiationException("DWR can't find a spring config. See the logs for solutions");
}
return factory.getBean(beanName);
}
catch (InstantiationException ex)
{
throw ex;
}
catch (Exception ex)
{
throw new InstantiationException("Illegal Access to default constructor on " + clazz.getName() + " due to: " + ex);
}
}
/**
* @return A found BeanFactory configuration
*/
private BeanFactory getBeanFactory()
{
// If someone has set a resource name then we need to load that.
if (configLocation != null && configLocation.length > 0)
{
log.info("Spring BeanFactory via ClassPathXmlApplicationContext using " + configLocation.length + "configLocations.");
return new ClassPathXmlApplicationContext(configLocation);
}
ServletContext srvCtx = ServerContextFactory.get().getServletContext();
HttpServletRequest request = null;
try
{
request = WebContextFactory.get().getHttpServletRequest();
}
catch (Exception ex)
{
// Probably on boot time
}
return request != null ? RequestContextUtils.getWebApplicationContext(request, srvCtx) : WebApplicationContextUtils.getWebApplicationContext(srvCtx);
}
/**
* Set a web-app wide BeanFactory.
* This method is misnamed (The parameter is a BeanFactory and not a
* XmlBeanFactory)
* @param factory The factory to set.
* @deprecated This method is misnamed use setOverrideBeanFactory
*/
@Deprecated
public static void setXmlBeanFactory(BeanFactory factory)
{
overrideFactory = factory;
}
/**
* Set a web-app wide BeanFactory.
* @param factory The factory to set.
*/
public static void setOverrideBeanFactory(BeanFactory factory)
{
overrideFactory = factory;
}
/**
* The name of the spring bean we want to create
*/
private String beanName = null;
/**
* The log stream
*/
private static final Log log = LogFactory.getLog(SpringCreator.class);
/**
* The Spring beans factory from which we get our beans.
*/
private BeanFactory factory = null;
/**
* An web-app wide BeanFactory that we can use to override any calculated
* ones.
*/
private static BeanFactory overrideFactory = null;
/**
* The cached type of bean that we are creating
*/
private Class<?> clazz = null;
/**
* An array of locations to search through for a beans.xml file
*/
private String[] configLocation = null;
}