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package com.sun.enterprise.util.net;

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 (containsCRorLF(urlPattern)) {
            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.isEmpty()) {
            return true;
        } else if (urlPattern.startsWith("/") &&
                urlPattern.indexOf("*.") < 0) {
            return true;
        } else {
            return false;
        }

    }

    /**
     * This method is used to check whether a url pattern contains a CR(#xD) or
     * LF (#xA). According to the Servlet spec the developer must be informed
     * when it does.
     * 
     * @param urlPattern
     *            the url pattern (must not be null)
     * @return true if it contains one or more CRs or LFs
     */
    public static boolean containsCRorLF(String urlPattern) {
        return (urlPattern.indexOf(NL) != -1  || urlPattern.indexOf (CR) != -1);
    }
}