Method resolveUrl

java/org/apache/jasper/tagplugins/jstl/Util.java:264–291

Utility methods taken from org.apache.taglibs.standard.tag.common.core.UrlSupport @param url The URL @param context The context @param pageContext The page context @return the absolute URL @throws JspException If the URL doesn't start with '/'

(String url, String context, PageContext pageContext)

     * @throws JspException If the URL doesn't start with '/'
     */
    public static String resolveUrl(String url, String context, PageContext pageContext) throws JspException {
        // don't touch absolute URLs
        if (isAbsoluteUrl(url)) {
            return url;
        }

        // normalize relative URLs against a context root
        HttpServletRequest request = (HttpServletRequest) pageContext.getRequest();
        if (context == null) {
            if (url.startsWith("/")) {
                return request.getContextPath() + url;
            } else {
                return url;
            }
        } else {
            if (!context.startsWith("/") || !url.startsWith("/")) {
                throw new JspTagException(Localizer.getMessage("jstl.urlMustStartWithSlash"));
            }
            if (context.equals("/")) {
                // Don't produce string starting with '//', many
                // browsers interpret this as host name, not as
                // path on same host.
                return url;
            } else {
                return context + url;
            }
        }
    }

    /**
     * Wraps responses to allow us to retrieve results as Strings. Mainly taken from