package com.eyeq.pivot4j.pentaho.servlet;
   
   import javax.servlet.ServletRequestAttributeEvent;
   import javax.servlet.ServletRequestEvent;
   import javax.servlet.http.HttpServletRequest;
   import javax.servlet.http.HttpServletRequestWrapper;
   import javax.servlet.http.HttpSession;
   
   import org.apache.commons.lang.ObjectUtils;
  import org.apache.myfaces.webapp.StartupServletContextListener;
  
  public class PluginServletRequest extends HttpServletRequestWrapper {
  
  	public static final String PLUGIN_PREFIX = "/plugin";
  
  	public static final String SERVLET_PATH = "/pivot4j/faces";
  
  	private PluginServletContext servletContext;
  
  	/**
  	 * @param servletContext
  	 * @param request
  	 */
  	public PluginServletRequest(PluginServletContext servletContext,
  			HttpServletRequest request) {
  		super(request);
  
  		this.servletContext = servletContext;
  	}
  
  	/**
  	 * @return the servletContext
  	 */
  	protected PluginServletContext getServletContext() {
  		return servletContext;
  	}
  
  	public void initialize() {
  		StartupServletContextListener listener = servletContext.getListener();
  		listener.requestInitialized(new ServletRequestEvent(servletContext,
  				this));
  	}
  
  	public void destroy() {
  		StartupServletContextListener listener = servletContext.getListener();
  		listener.requestDestroyed(new ServletRequestEvent(servletContext, this));
  	}
  
  	/**
  	 * @see javax.servlet.http.HttpServletRequestWrapper#getServletPath()
  	 */
  	@Override
  	public String getServletPath() {
  		return PLUGIN_PREFIX + SERVLET_PATH;
  	}
  
  	/**
  	 * @see javax.servlet.http.HttpServletRequestWrapper#getPathInfo()
  	 */
  	@Override
  	public String getPathInfo() {
  		String pathInfo = super.getPathInfo();
  
  		if (pathInfo.startsWith(SERVLET_PATH)) {
  			pathInfo = pathInfo.substring(SERVLET_PATH.length());
  		}
  
  		return pathInfo;
  	}
  
  	/**
  	 * @see javax.servlet.ServletRequestWrapper#setAttribute(java.lang.String,
  	 *      java.lang.Object)
  	 */
  	@Override
  	public void setAttribute(String name, Object value) {
  		Object oldValue = getAttribute(name);
  
  		super.setAttribute(name, value);
  
  		StartupServletContextListener listener = servletContext.getListener();
  
  		if (oldValue == null) {
  			listener.attributeAdded(new ServletRequestAttributeEvent(
  					servletContext, this, name, value));
  		} else if (!ObjectUtils.equals(oldValue, value)) {
  			listener.attributeReplaced(new ServletRequestAttributeEvent(
  					servletContext, this, name, value));
  		}
  	}
  
  	/**
  	 * @see javax.servlet.ServletRequestWrapper#removeAttribute(java.lang.String)
  	 */
  	@Override
  	public void removeAttribute(String name) {
  		Object value = getAttribute(name);
  
  		super.removeAttribute(name);
 
 		StartupServletContextListener listener = servletContext.getListener();
 		listener.attributeRemoved(new ServletRequestAttributeEvent(
 				servletContext, this, name, value));
 	}
 
 	/**
 	 * @see javax.servlet.http.HttpServletRequestWrapper#getSession()
 	 */
 	@Override
 	public HttpSession getSession() {
 		HttpSession session = super.getSession();
 
 		if (!(session instanceof PluginServletSession)) {
 			session = new PluginServletSession(servletContext, session);
 		}
 
 		return session;
 	}
 
 	/**
 	 * @see javax.servlet.http.HttpServletRequestWrapper#getSession(boolean)
 	 */
 	@Override
 	public HttpSession getSession(boolean create) {
 		HttpSession session = super.getSession(create);
 
 		if (!(session instanceof PluginServletSession)) {
 			session = new PluginServletSession(servletContext, session);
 		}
 
 		return session;
 	}
 }