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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