facesrequestprocessor.java

structs源码

        if (log.isTraceEnabled()) {
            log.trace("Performing standard action perform");
        }
        ActionForward result =
            super.processActionPerform(request, response, action,
                                       form, mapping);
        if (log.isDebugEnabled()) {
            log.debug("Standard action perform returned " +
                      (result == null ? "NULL" :
                      result.getPath()) + " forward path");
        }
        return (result);

    }


    // Override default processing to provide logging
    protected boolean processForward(HttpServletRequest request,
                                     HttpServletResponse response,
                                     ActionMapping mapping)
        throws IOException, ServletException {

        if (log.isTraceEnabled()) {
            log.trace("Performing standard forward handling");
        }
        boolean result = super.processForward
            (request, response, mapping);
        if (log.isDebugEnabled()) {
            log.debug("Standard forward handling returned " + result);
        }
        return (result);

    }


    // Override default processing to provide logging
    protected void processForwardConfig(HttpServletRequest request,
                                        HttpServletResponse response,
                                        ForwardConfig forward)
        throws IOException, ServletException {

        if (log.isTraceEnabled()) {
            log.trace("Performing standard forward config handling");
        }
        super.processForwardConfig(request, response, forward);
        if (log.isDebugEnabled()) {
            log.debug("Standard forward config handling completed");
        }

    }


    // Override default processing to provide logging
    protected boolean processInclude(HttpServletRequest request,
                                     HttpServletResponse response,
                                     ActionMapping mapping)
        throws IOException, ServletException {

        if (log.isTraceEnabled()) {
            log.trace("Performing standard include handling");
        }
        boolean result = super.processInclude
            (request, response, mapping);
        if (log.isDebugEnabled()) {
            log.debug("Standard include handling returned " + result);
        }
        return (result);

    }


    /**
     * <p>Identify and return the path component (from the request URI for a
     * non-Faces request, or from the form event for a Faces request)
     * that we will use to select an ActionMapping to dispatch with.
     * If no such path can be identified, create an error response and return
     * <code>null</code>.</p>
     *
     * @param request The servlet request we are processing
     * @param response The servlet response we are creating
     *
     * @exception IOException if an input/output error occurs
     */
    protected String processPath(HttpServletRequest request,
                                 HttpServletResponse response)
        throws IOException {

        // Are we processing a Faces request?
        ActionEvent event = (ActionEvent)
            request.getAttribute(Constants.ACTION_EVENT_KEY);

        // Handle non-Faces requests in the usual way
        if (event == null) {
            if (log.isTraceEnabled()) {
                log.trace("Performing standard processPath() processing");
            }
            return (super.processPath(request, response));
        }

        // Calculate the path from the form name
        UIComponent component = event.getComponent();
        if (log.isTraceEnabled()) {
            log.trace("Locating form parent for command component " +
                      event.getComponent());
        }
        while (!(component instanceof FormComponent)) {
            component = component.getParent();
            if (component == null) {
                log.warn("Command component was not nested in a Struts form!");
                return (null);
            }
        }
        if (log.isDebugEnabled()) {
            log.debug("Returning selected path of '" +
                      ((FormComponent) component).getAction() + "'");
        }
        return (((FormComponent) component).getAction());

    }


    /**
     * <p>Populate the properties of the specified <code>ActionForm</code>
     * instance from the request parameters included with this request,
     * <strong>IF</strong> this is a non-Faces request.  For a Faces request,
     * this will have already been done by the <em>Update Model Values</em>
     * phase of the request processing lifecycle, so all we have to do is
     * recognize whether the request was cancelled or not.</p>
     *
     * @param request The servlet request we are processing
     * @param response The servlet response we are creating
     * @param form The ActionForm instance we are populating
     * @param mapping The ActionMapping we are using
     *
     * @exception ServletException if thrown by RequestUtils.populate()
     */
    protected void processPopulate(HttpServletRequest request,
                                   HttpServletResponse response,
                                   ActionForm form,
                                   ActionMapping mapping)
        throws ServletException {

        // Are we processing a Faces request?
        ActionEvent event = (ActionEvent)
            request.getAttribute(Constants.ACTION_EVENT_KEY);

        // Handle non-Faces requests in the usual way
        if (event == null) {
            if (log.isTraceEnabled()) {
                log.trace("Performing standard processPopulate() processing");
            }
            super.processPopulate(request, response, form, mapping);
            return;
        }

        // Faces Requests require no processing for form bean population
        // so we need only check for the cancellation command name
        if (log.isTraceEnabled()) {
            log.trace("Faces request, so no processPopulate() processing");
        }
        UIComponent source = event.getComponent();
        if (source instanceof UICommand) {
            if ("cancel".equals(((UICommand) source).getId())) {
                if (log.isTraceEnabled()) {
                    log.trace("Faces request with cancel button pressed");
                }
                request.setAttribute(Globals.CANCEL_KEY, Boolean.TRUE);
            }
        }

    }


    // Override default processing to provide logging
    protected boolean processValidate(HttpServletRequest request,
                                      HttpServletResponse response,
                                      ActionForm form,
                                      ActionMapping mapping)
        throws IOException, ServletException, InvalidCancelException {

        if (log.isTraceEnabled()) {
            log.trace("Performing standard validation");
        }
        boolean result = super.processValidate
            (request, response, form, mapping);
        if (log.isDebugEnabled()) {
            log.debug("Standard validation processing returned " + result);
        }
        return (result);

    }


    // --------------------------------------------------------- Private Methods


    /**
     * <p>Return the used Lifecycle ID (default or custom).</p>
     */
    private String getLifecycleId()
    {
        String lifecycleId = this.servlet.getServletContext().getInitParameter(LIFECYCLE_ID_ATTR);
        return lifecycleId != null ? lifecycleId : LifecycleFactory.DEFAULT_LIFECYCLE;
    }  

    /**
     * <p>Return <code>true</code> if the specified context-relative URI
     * specifies a request to be processed by the Struts controller servlet.</p>
     *
     * @param uri URI to be checked
     */
    private boolean isStrutsRequest(String uri) {

        int question = uri.indexOf("?");
        if (question >= 0) {
            uri = uri.substring(0, question);
        }
        String mapping = (String)
            servlet.getServletContext().getAttribute(Globals.SERVLET_KEY);
        if (mapping == null) {
            return (false);
        } else if (mapping.startsWith("*.")) {
            return (uri.endsWith(mapping.substring(1)));
        } else if (mapping.endsWith("/*")) {
            return (uri.startsWith(mapping.substring(0, mapping.length() - 2)));
        } else {
            return (false);
        }

    }


}