有点问题提问(有研究过 struts-examples的老兄请进)

Question

用于数据验证，请看html:javascript标签的作用,JavascriptValidatorTag.java:
public int doStartTag() throws JspException {
        StringBuffer results = new StringBuffer();        ModuleConfig config = RequestUtils.getModuleConfig(pageContext);
        ValidatorResources resources =
            (ValidatorResources) pageContext.getAttribute(
                ValidatorPlugIn.VALIDATOR_KEY + config.getPrefix(),
                PageContext.APPLICATION_SCOPE);        Locale locale = RequestUtils.retrieveUserLocale(this.pageContext, null);        Form form = resources.get(locale, formName);
        if (form != null) {
            if ("true".equalsIgnoreCase(dynamicJavascript)) {
                MessageResources messages =
                    (MessageResources) pageContext.getAttribute(
                        bundle + config.getPrefix(),
                        PageContext.APPLICATION_SCOPE);                List lActions = new ArrayList();
                List lActionMethods = new ArrayList();                // Get List of actions for this Form
                for (Iterator i = form.getFields().iterator(); i.hasNext();) {
                    Field field = (Field) i.next();                    for (Iterator x = field.getDependencies().iterator(); x.hasNext();) {
                        Object o = x.next();                        if (o != null && !lActionMethods.contains(o)) {
                            lActionMethods.add(o);
                        }
                    }                }                // Create list of ValidatorActions based on lActionMethods
                for (Iterator i = lActionMethods.iterator(); i.hasNext();) {
                    String depends = (String) i.next();
                    ValidatorAction va = resources.getValidatorAction(depends);                    // throw nicer NPE for easier debugging
                    if (va == null) {
                        throw new NullPointerException(
                            "Depends string \""
                                + depends
                                + "\" was not found in validator-rules.xml.");
                    }               
                    
                    String javascript = va.getJavascript();
                    if (javascript != null && javascript.length() > 0) {
                        lActions.add(va);
                    } else {
                        i.remove();
                    }
                }                Collections.sort(lActions, new Comparator() {
                    public int compare(Object o1, Object o2) {
                        ValidatorAction va1 = (ValidatorAction) o1;
                        ValidatorAction va2 = (ValidatorAction) o2;                        if ((va1.getDepends() == null || va1.getDepends().length() == 0)
                            && (va2.getDepends() == null || va2.getDepends().length() == 0)) {
                            return 0;
                        } else if (
                            (va1.getDepends() != null && va1.getDepends().length() > 0)
                                && (va2.getDepends() == null || va2.getDepends().length() == 0)) {
                            return 1;
                        } else if (
                            (va1.getDepends() == null || va1.getDepends().length() == 0)
                                && (va2.getDepends() != null && va2.getDepends().length() > 0)) {
                            return -1;
                        } else {
                            return va1.getDependencies().size() - va2.getDependencies().size();
                        }
                    }
                });           ...................太长了！！！！！！！