package com.eyeq.pivot4j.pentaho.servlet;
   
   import java.io.IOException;
   import java.io.InputStream;
   import java.net.MalformedURLException;
   import java.net.URL;
   import java.util.Enumeration;
   import java.util.LinkedList;
   import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import javax.faces.view.facelets.ResourceResolver;
  import javax.servlet.RequestDispatcher;
  import javax.servlet.Servlet;
  import javax.servlet.ServletContext;
  import javax.servlet.ServletContextAttributeEvent;
  import javax.servlet.ServletContextEvent;
  import javax.servlet.ServletException;
  
  import org.apache.commons.lang.ObjectUtils;
  import org.apache.commons.lang.UnhandledException;
  import org.apache.myfaces.webapp.StartupServletContextListener;
  
  import edu.emory.mathcs.backport.java.util.Collections;
  
  public class PluginServletContext implements ServletContext {
  
  	private ServletContext wrappedContext;
  
  	private StartupServletContextListener listener;
  
  	private Map<String, String> initParameters;
  
  	private ResourceResolver resourceResolver;
  
  	/**
  	 * @param context
  	 * @param initParameters
  	 */
  	public PluginServletContext(ServletContext context,
  			Map<String, String> initParameters) {
  		this.wrappedContext = context;
  		this.initParameters = initParameters;
  
  		this.listener = new StartupServletContextListener();
  		this.resourceResolver = new PluginResourceResolver();
  	}
  
  	/**
  	 * @return the wrappedContext
  	 */
  	protected ServletContext getWrappedContext() {
  		return wrappedContext;
  	}
  
  	/**
  	 * @return the resourceResolver
  	 */
  	protected ResourceResolver getResourceResolver() {
  		return resourceResolver;
  	}
  
  	/**
  	 * @return the listener
  	 */
  	public StartupServletContextListener getListener() {
  		return listener;
  	}
  
  	public void initialize() {
  		setAttribute("org.apache.myfaces.DYNAMICALLY_ADDED_FACES_SERVLET", true);
  
  		listener.contextInitialized(new ServletContextEvent(this));
  	}
  
  	public void destroy() {
  		listener.contextDestroyed(new ServletContextEvent(this));
  	}
  
  	/**
  	 * @param name
  	 * @return
  	 * @see javax.servlet.ServletContext#getAttribute(java.lang.String)
  	 */
  	public Object getAttribute(String name) {
  		return wrappedContext.getAttribute(name);
  	}
  
  	/**
  	 * @return
  	 * @see javax.servlet.ServletContext#getAttributeNames()
  	 */
  	public Enumeration<?> getAttributeNames() {
  		return wrappedContext.getAttributeNames();
  	}
  
  	/**
  	 * @param uripath
 	 * @return
 	 * @see javax.servlet.ServletContext#getContext(java.lang.String)
 	 */
 	public ServletContext getContext(String uripath) {
 		return wrappedContext.getContext(uripath);
 	}
 
 	/**
 	 * @return
 	 */
 	public String getContextPath() {
 		return wrappedContext.getContextPath();
 	}
 
 	/**
 	 * @param name
 	 * @return
 	 * @see javax.servlet.ServletContext#getInitParameter(java.lang.String)
 	 */
 	public String getInitParameter(String name) {
 		if (initParameters != null && initParameters.containsKey(name)) {
 			return initParameters.get(name);
 		}
 
 		return wrappedContext.getInitParameter(name);
 	}
 
 	/**
 	 * @return
 	 * @see javax.servlet.ServletContext#getInitParameterNames()
 	 */
 	public Enumeration<?> getInitParameterNames() {
 		Enumeration<?> e = wrappedContext.getInitParameterNames();
 
 		if (initParameters == null) {
 			return e;
 		}
 
 		List<String> names = new LinkedList<String>();
 
 		for (String name : initParameters.keySet()) {
 			names.add(name);
 		}
 
 		while (e.hasMoreElements()) {
 			names.add(e.nextElement().toString());
 		}
 
 		return Collections.enumeration(names);
 	}
 
 	/**
 	 * @return
 	 * @see javax.servlet.ServletContext#getMajorVersion()
 	 */
 	public int getMajorVersion() {
 		return wrappedContext.getMajorVersion();
 	}
 
 	/**
 	 * @return
 	 * @see javax.servlet.ServletContext#getMinorVersion()
 	 */
 	public int getMinorVersion() {
 		return wrappedContext.getMinorVersion();
 	}
 
 	/**
 	 * @param file
 	 * @return
 	 * @see javax.servlet.ServletContext#getMimeType(java.lang.String)
 	 */
 	public String getMimeType(String file) {
 		return wrappedContext.getMimeType(file);
 	}
 
 	/**
 	 * @param name
 	 * @return
 	 * @see javax.servlet.ServletContext#getNamedDispatcher(java.lang.String)
 	 */
 	public RequestDispatcher getNamedDispatcher(String name) {
 		return wrappedContext.getNamedDispatcher(name);
 	}
 
 	/**
 	 * @param path
 	 * @return
 	 * @see javax.servlet.ServletContext#getRealPath(java.lang.String)
 	 */
 	public String getRealPath(String path) {
 		return wrappedContext.getRealPath(path);
 	}
 
 	/**
 	 * @param path
 	 * @return
 	 * @see javax.servlet.ServletContext#getRequestDispatcher(java.lang.String)
 	 */
 	public RequestDispatcher getRequestDispatcher(String path) {
 		return wrappedContext.getRequestDispatcher(path);
 	}
 
 	/**
 	 * @param path
 	 * @return
 	 * @throws MalformedURLException
 	 * @see javax.servlet.ServletContext#getResource(java.lang.String)
 	 */
 	public URL getResource(String path) throws MalformedURLException {
 		return resourceResolver.resolveUrl(path);
 	}
 
 	/**
 	 * @param path
 	 * @return
 	 * @see javax.servlet.ServletContext#getResourceAsStream(java.lang.String)
 	 */
 	public InputStream getResourceAsStream(String path) {
 		InputStream in = null;
 
 		try {
 			URL url = getResource(path);
 
 			if (url != null) {
 				in = url.openStream();
 			}
 		} catch (IOException e) {
 			throw new UnhandledException(e);
 		}
 
 		return in;
 	}
 
 	/**
 	 * @param path
 	 * @return
 	 * @see javax.servlet.ServletContext#getResourcePaths(java.lang.String)
 	 */
 	public Set<?> getResourcePaths(String path) {
 		return wrappedContext.getResourcePaths(path);
 	}
 
 	/**
 	 * @return
 	 * @see javax.servlet.ServletContext#getServerInfo()
 	 */
 	public String getServerInfo() {
 		return wrappedContext.getServerInfo();
 	}
 
 	/**
 	 * @param name
 	 * @return
 	 * @throws ServletException
 	 * @deprecated
 	 * @see javax.servlet.ServletContext#getServlet(java.lang.String)
 	 */
 	public Servlet getServlet(String name) throws ServletException {
 		return wrappedContext.getServlet(name);
 	}
 
 	/**
 	 * @return
 	 * @see javax.servlet.ServletContext#getServletContextName()
 	 */
 	public String getServletContextName() {
 		return wrappedContext.getServletContextName();
 	}
 
 	/**
 	 * @return
 	 * @deprecated
 	 * @see javax.servlet.ServletContext#getServletNames()
 	 */
 	public Enumeration<?> getServletNames() {
 		return wrappedContext.getServletNames();
 	}
 
 	/**
 	 * @return
 	 * @deprecated
 	 * @see javax.servlet.ServletContext#getServlets()
 	 */
 	public Enumeration<?> getServlets() {
 		return wrappedContext.getServlets();
 	}
 
 	/**
 	 * @param throwable
 	 * @param msg
 	 * @deprecated
 	 * @see javax.servlet.ServletContext#log(java.lang.Exception,
 	 *      java.lang.String)
 	 */
 	public void log(Exception throwable, String msg) {
 		wrappedContext.log(throwable, msg);
 	}
 
 	/**
 	 * @param msg
 	 * @param throwable
 	 * @see javax.servlet.ServletContext#log(java.lang.String,
 	 *      java.lang.Throwable)
 	 */
 	public void log(String msg, Throwable throwable) {
 		wrappedContext.log(msg, throwable);
 	}
 
 	/**
 	 * @param msg
 	 * @see javax.servlet.ServletContext#log(java.lang.String)
 	 */
 	public void log(String msg) {
 		wrappedContext.log(msg);
 	}
 
 	/**
 	 * @param name
 	 * @see javax.servlet.ServletContext#removeAttribute(java.lang.String)
 	 */
 	public void removeAttribute(String name) {
 		Object value = getAttribute(name);
 
 		wrappedContext.removeAttribute(name);
 
 		listener.attributeRemoved(new ServletContextAttributeEvent(this, name,
 				value));
 	}
 
 	/**
 	 * @param name
 	 * @param value
 	 * @see javax.servlet.ServletContext#setAttribute(java.lang.String,
 	 *      java.lang.Object)
 	 */
 	public void setAttribute(String name, Object value) {
 		Object oldValue = getAttribute(name);
 
 		wrappedContext.setAttribute(name, value);
 
 		if (oldValue == null) {
 			listener.attributeAdded(new ServletContextAttributeEvent(this,
 					name, value));
 		} else if (!ObjectUtils.equals(oldValue, value)) {
 			listener.attributeReplaced(new ServletContextAttributeEvent(this,
 					name, value));
 		}
 	}
 }