/*
 * Created on 25/Fev/2003
 *
 * 
 */
package net.sourceforge.fenixedu.presentationTier.config;

import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sourceforge.fenixedu.presentationTier.Action.exceptions.FenixActionException;
import net.sourceforge.fenixedu.presentationTier.Action.resourceAllocationManager.utils.PresentationConstants;

import org.apache.struts.Globals;
import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.config.ExceptionConfig;

/**
 * @author Joćo Mota
 */
public class FenixPublicExceptionHandler extends FenixExceptionHandler {

    /**
     * Handle the exception. Return the <code>ActionForward</code> instance (if
     * any) returned by the called <code>ExceptionHandler</code>.
     * 
     * @param ex
     *            The exception to handle
     * @param ae
     *            The ExceptionConfig corresponding to the exception
     * @param mapping
     *            The ActionMapping we are processing
     * @param formInstance
     *            The ActionForm we are processing
     * @param request
     *            The servlet request we are processing
     * @param response
     *            The servlet response we are creating
     * 
     * @exception ServletException
     *                if a servlet exception occurs
     * 
     * @since Struts 1.1
     */
    public ActionForward execute(Exception ex, ExceptionConfig ae, ActionMapping mapping, ActionForm formInstance,
	    HttpServletRequest request, HttpServletResponse response) throws ServletException {

	super.execute(ex, ae, mapping, formInstance, request, response);

	ActionForward forward = null;
	ActionError error = null;

	request.setAttribute(PresentationConstants.ORIGINAL_MAPPING_KEY, mapping);

	request.setAttribute(PresentationConstants.EXCEPTION_STACK_TRACE, ex.getStackTrace());

	request.setAttribute(PresentationConstants.REQUEST_CONTEXT, requestContextGetter(request));

	if (ae.getScope() != "request") {
	    ae.setScope("request");
	}

	String property = null;

	// Figure out the error
	if (ex instanceof FenixActionException) {
	    error = ((FenixActionException) ex).getError();
	    property = ((FenixActionException) ex).getProperty();
	} else {
	    error = new ActionError(ae.getKey(), ex.getMessage());
	    property = error.getKey();
	}

	// Store the exception
	request.setAttribute(Globals.EXCEPTION_KEY, ex);
	super.storeException(request, property, error, forward, ae.getScope());

	return super.execute(ex, ae, mapping, formInstance, request, response);
    }

    private String requestContextGetter(HttpServletRequest request) {

	Enumeration requestContents = request.getAttributeNames();
	String context = "";
	while (requestContents.hasMoreElements()) {
	    String requestElement = requestContents.nextElement().toString();
	    context += "RequestElement:" + requestElement + "\n";
	    context += "RequestElement Value:" + request.getAttribute(requestElement) + "\n";
	}

	return context;
    }

}