package com.googlecode.richrest.server.provider;
import java.io.Serializable;
import java.util.List;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.ContextLoader;
import com.googlecode.richrest.Action;
import com.googlecode.richrest.server.ActionInterceptor;
import com.googlecode.richrest.server.ExceptionHandler;
import com.googlecode.richrest.server.interceptor.ActionInterceptorStack;
/**
* ActionProvider Spring Implementation. See:
* <a href="http://www.springframework.org">http://www.springframework.org</a>
* @author <a href="mailto:liangfei0201@gmail.com">liangfei</a>
*/
public class SpringActionProvider extends AbstractActionProvider {
private ApplicationContext applicationContext;
protected void init(ServletContext servletContext, ServletConfig servletConfig) {
this.applicationContext = ContextLoader.getCurrentWebApplicationContext();
if (this.applicationContext == null) { // 如果未配置Spring上下文，启用缺省配置
throw new IllegalStateException("Spring framework non initialized! Please config web.xml: \n<listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener>" );
}
}
@SuppressWarnings("unchecked")
protected Action<Serializable, Serializable> findAction(String actionName) throws Exception {
return (Action<Serializable, Serializable>)applicationContext.getBean(actionName);
}
/**
* 拦截器栈Bean引用ID，该Bean应该为<code>ActionInterceptorStack</code>的实例
* @see com.googlecode.richrest.server.interceptor.ActionInterceptorStack
*/
public static final String ACTION_INTERCEPTOR_STACK_BEAN_ID = "actionInterceptorStack";
protected List<ActionInterceptor> findActionInterceptors() throws Exception {
try {
ActionInterceptorStack actionInterceptorStack = (ActionInterceptorStack)applicationContext.getBean(ACTION_INTERCEPTOR_STACK_BEAN_ID);
if (actionInterceptorStack == null)
return null;
return actionInterceptorStack.getActionInterceptors();
} catch (NoSuchBeanDefinitionException e) {
return null;
}
}
public ExceptionHandler getExceptionHandler(Class<? extends Throwable> exceptionClass) {
return (ExceptionHandler)applicationContext.getBean(exceptionClass.getName());
}
}