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package er.extensions.jspservlet;

import java.lang.reflect.Method;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.UnavailableException;

import com.webobjects.jspservlet.WOServletAdaptor;

import er.extensions.appserver.ERXApplication;

/**
 * This class is just a wrapper around <code>WOServletAdaptor</code>.
 * <code>ERXServletAdaptor</code> must be used to make Wonder applications
 * compliant with WAR deployment.
 * <p>
 * This class is responsible to invoke the
 * {@link ERXApplication#setup(String[])} method before the application
 * initialization.
 * 
 * @see WOServletAdaptor
 * @author <a href="mailto:hprange@moleque.com.br">Henrique Prange</a>
 */
public class ERXServletAdaptor extends WOServletAdaptor {

	/**
	 * Overrides the <code>_appliationInit</code> and invoke the
	 * {@link ERXApplication#setup(String[])} method before the application
	 * initialization.
	 * 
	 * @see WOServletAdaptor#_applicationInit(ServletContext)
	 */
	
	/*
	 * 
	 * @param servletContext
	 *            The servlet context to get the application class
	 * @throws UnavailableException
	 *             If something wrong happens while trying to invoke the
	 *             application setup method.
	 */
	static void invokeApplicationSetupMethod(ServletContext servletContext) throws UnavailableException {
		ClassLoader classLoader = WOServletAdaptor.class.getClassLoader();

		try {
			String applicationClassName = servletContext.getInitParameter("WOApplicationClass");

			if (applicationClassName == null || "".equals(applicationClassName)) {
				throw new UnavailableException("WOApplicationClass must be defined. Verify your web.xml configuration.");
			}

			Class applicationClass = classLoader.loadClass(applicationClassName);

			Method method = applicationClass.getMethod("setup", new Class[] { String[].class });

			method.invoke(null, new Object[] { new String[0] });
		}
		catch (Exception e) {
			e.printStackTrace();

			throw new UnavailableException("Error initializing ERXServletAdaptor: " + e.getMessage());
		}
	}

	public ERXServletAdaptor() throws ServletException {
		super();
	}

	@Override
	public void init() throws ServletException {
		ERXServletAdaptor.invokeApplicationSetupMethod(getServletContext());
		super.init();
	}
	
}