public boolean execute(Context context) throws Exception 
{
        // Is there a form bean for this request?
        ActionForm actionForm = (ActionForm)
            context.get(getActionFormKey());
        if (actionForm == null) {
            return (false);
        }
        // Reset the form bean property values
        ActionConfig actionConfig = (ActionConfig)
            context.get(getActionConfigKey());
        reset(context, actionConfig, actionForm);
        populate(context, actionConfig, actionForm);
        handleCancel(context, actionConfig, actionForm);
        return (false);
}

Populate the form bean (if any) for this request.

 public String getActionConfigKey() 
{
        return (this.actionConfigKey);
}

Return the context attribute key under which the ActionConfig for the currently selected application action is stored.

 public String getActionFormKey() 
{
        return (this.actionFormKey);
}

Return the context attribute key under which the ActionForm for the currently selected application action is stored.

 public String getCancelKey() 
{
        return (this.cancelKey);
}

Return the context attribute key under which the cancellation flag for this request is stored.

 protected  void handleCancel(Context context,
    ActionConfig actionConfig,
    ActionForm actionForm) throws Exception 
{
        WebContext wcontext = (WebContext) context;
        Map paramValues = wcontext.getParamValues();
        // Set the cancellation attribute if appropriate
        if ((paramValues.get(org.apache.struts.taglib.html.Constants.CANCEL_PROPERTY) != null) ||
            (paramValues.get(org.apache.struts.taglib.html.Constants.CANCEL_PROPERTY_X) != null)) {
            context.put(getCancelKey(), Boolean.TRUE);
            wcontext.getRequestScope().put(Globals.CANCEL_KEY, Boolean.TRUE);
        } else {
            context.put(getCancelKey(), Boolean.FALSE);
        }
}

 protected  void populate(Context context,
    ActionConfig actionConfig,
    ActionForm actionForm) throws Exception 
{
        WebContext wcontext = (WebContext) context;
        Map paramValues = wcontext.getParamValues();
        Map parameters = new HashMap();
        String prefix = actionConfig.getPrefix();
        String suffix = actionConfig.getSuffix();
        Iterator keys = paramValues.keySet().iterator();
        while (keys.hasNext()) {
            String name = (String) keys.next();
            String stripped = name;
            if (prefix != null) {
                if (!stripped.startsWith(prefix)) {
                    continue;
                }
                stripped = stripped.substring(prefix.length());
            }
            if (suffix != null) {
                if (!stripped.endsWith(suffix)) {
                    continue;
                }
                stripped =
                        stripped.substring(0, stripped.length() - suffix.length());
            }
            parameters.put(stripped, paramValues.get(name));
        }
        BeanUtils.populate(actionForm, parameters);
}

Base implementation assumes that the Context can be cast to WebContext and copies the parameter values from the context to the ActionForm.

Note that this implementation does not handle "file uploads" because as far as I know there is no API for handling that without committing to servlets -- in a servlet environment, use org.apache.struts.chain.servlet.PopulateActionForm.

 abstract protected  void reset(Context context,
    ActionConfig actionConfig,
    ActionForm actionForm)
Call the reset() method on the specified form bean.

 public  void setActionConfigKey(String actionConfigKey) 
{
        this.actionConfigKey = actionConfigKey;
}

Set the context attribute key under which the ActionConfig for the currently selected application action is stored.

 public  void setActionFormKey(String actionFormKey) 
{
        this.actionFormKey = actionFormKey;
}

Set the context attribute key under which the ActionForm for the currently selected application action is stored.

 public  void setCancelKey(String cancelKey) 
{
        this.cancelKey = cancelKey;
}

Set the context attribute key under which the cancellation flag for this request is stored.