@Override

    public ValidationResult validate(IResource resource, int kind, ValidationState state, IProgressMonitor monitor) {

        return main(resource.getLocationURI().toString(), resource);

    }

    public ValidationResult main(String uri, IResource resource) {

        String language = "en";

        String profile = "css3"; // css2, css21 (default), css3, svg, svgbasic,

        // svgtiny, atsc-tv, mobile, tv

        String medium = ""; // (default), aural, braille, embossed,

        // handheld, print, projection, screen,

        // tty, tv, presentation

        int warningLevel = 2; // -1 (no warning), 0, 1, 2 (default, all the

        // warnings)

        // first, we get the parameters and create an application context

        ApplContext ac = new ApplContext(language);

        if (profile != null && !"none".equals(profile)) {

            if ("css1".equals(profile) || "css2".equals(profile) || "css21".equals(profile) || "css3".equals(profile)

                    || "svg".equals(profile) || "svgbasic".equals(profile) || "svgtiny".equals(profile)) {

                ac.setCssVersion(profile);

            } else {

                ac.setProfile(profile);

                ac.setCssVersion(PropertiesLoader.config.getProperty("defaultProfile"));

            }

        } else {

            ac.setProfile(profile);

            ac.setCssVersion(PropertiesLoader.config.getProperty("defaultProfile"));

        }

        // medium to use

        ac.setMedium(medium);

        // HTML document

        try {

            DocumentParser urlParser = new DocumentParser(ac, uri);

            return handleRequest(ac, uri, urlParser.getStyleSheet(), warningLevel, true, resource);

        } catch (Exception e) {

            Activator.log(e);

        }

        return null;

    }

    private ValidationResult handleRequest(ApplContext ac, String title, StyleSheet styleSheet, int warningLevel,

            boolean errorReport, IResource resource) throws Exception {

        if (styleSheet == null) {

            throw new IOException(ac.getMsg().getServletString("process") + " " + title);

        }

        styleSheet.findConflicts(ac);

        ValidationResult result = new ValidationResult();

        CssError[] errors = styleSheet.getErrors().getErrors();

        for (CssError cssError : errors) {

            String msg = cssError.getException().getLocalizedMessage();

            if (msg != null && msg.trim().length() > 0) {

                ValidatorMessage message = createMessage(resource, cssError.getLine(), msg, IMarker.SEVERITY_WARNING);

                result.add(message);

            }

        }

        Warning[] warnings = styleSheet.getWarnings().getWarnings();

        for (Warning warning : warnings) {

            ValidatorMessage message = createMessage(resource, warning.getLine(), warning.getWarningMessage(),

                    IMarker.SEVERITY_WARNING);

            result.add(message);

        }

        return result;

    }

    private ValidatorMessage createMessage(IResource resource, int line, String msg, int severity) {

        ValidatorMessage message = ValidatorMessage.create(msg, resource);

        message.setAttribute(IMarker.LINE_NUMBER, line);

        message.setAttribute(IMarker.SEVERITY, severity);

        return message;

    }