check the validity of url pattern according to the spec. : URL « Network Protocol « Java

check the validity of url pattern according to the spec.


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public class URLPattern {
    // In Ascii table, New Line (NL) decimal value is 10
    private final static int NL = 10;
    // In Ascii table, Carriage Return (CR) decimal value is 13
    private final static int CR = 13;

     *  This method is used to check the validity of url pattern 
     *  according to the spec. It is used in the following places:
     *  1. in WebResourceCollection 
     *  2. in ServletMapping
     *  3. in ServletFilterMapping
     *  (above three see Servlet Spec, from version 2.3 on, 
     *  Secion 13.2: "Rules for Processing the Deployment Descriptor")
     *  4. in jsp-property-group 
     *  (see JSP.3.3: "JSP Property Groups")
     *  @param urlPattern the url pattern
     *  @return false for invalid url pattern
    public static boolean isValid(String urlPattern) {
        // URL Pattern should not contain New Line (NL) or
        // Carriage Return (CR)
        if (urlPattern.indexOf(NL) != -1  || urlPattern.indexOf (CR) != -1) {
            return false;

        // Check validity for extension mapping
        if (urlPattern.startsWith("*.")) {
            if (urlPattern.indexOf('/') < 0) {
                return true;
            } else {
                return false;

        // check validity for path mapping
        if ( urlPattern.startsWith("/") && urlPattern.indexOf("*.") < 0) {
            return true;
        } else {
            return false;



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