public boolean execute(ActionContext actionCtx) throws Exception 
{
    // ---------------------------------------------------------- Public Methods
        if (shouldProcess(actionCtx)) {
            Command command = getCommand(actionCtx);
            if (command != null) {
                return (command.execute(actionCtx));
            }
        }
        return (false);
}

If the context is "valid", lookup a command and execute it.

 protected Command getCommand(ActionContext context) 
{
        ActionConfig actionConfig = context.getActionConfig();
        String commandName = actionConfig.getCommand();
        if (commandName == null) {
            return null;
        }
        String catalogName = actionConfig.getCatalog();
        return getCommand(commandName, catalogName);
}

Find the ActionConfig in the current context and, if it is properly configured, lookup the appropriate commons-chain command.

 protected Command getCommand(String commandName,
    String catalogName) 
{
        if (commandName == null) {
            return null;
        }
        Catalog catalog;
        if (catalogName != null) {
            catalog = CatalogFactory.getInstance().getCatalog(catalogName);
            if (catalog == null) {
                LOG.warn("When looking up " + commandName + ","
                    + " no catalog found under " + catalogName);
                return null;
            }
        } else {
            catalogName = "the default catalog";
            catalog = CatalogFactory.getInstance().getCatalog();
            if (catalog == null) {
                LOG.warn("When looking up " + commandName + ","
                    + " no default catalog found.");
                return null;
            }
        }
        if (LOG.isDebugEnabled()) {
            LOG.debug("looking up command " + commandName + " in "
                + catalogName);
        }
        return catalog.getCommand(commandName);
}

Retrieve the specified Command from the specified Catalog.

 protected boolean shouldProcess(ActionContext context) 
{
        // Skip processing if the current request is not valid
        Boolean valid = context.getFormValid();
        return ((valid != null) && valid.booleanValue());
}

Evaluate the current context to see if a command should even be executed.