private Url tryGet(String url) {
        SoftReference<Url> softRef = Url.parsedUrls.get(url);
        return (null == softRef) ? null : softRef.get();
    }
private Url tryGet(String url) {
        SoftReference<Url> softRef = Url.parsedUrls.get(url);
        return (null == softRef) ? null : softRef.get();
    }
private Url tryGet ( String url ) { SoftReference < Url > softRef = Url . parsedUrls . get ( url ) ; return ( null == softRef ) ? null : softRef . get ( ) ; }
try get from cache

@param url
@return
try get from cache