Method lookup

java/org/apache/tomcat/util/digester/RulesBase.java:185–203

Return a List of Rule instances for the specified pattern that also match the specified namespace URI (if any). If there are no such rules, return null . @param namespaceURI Namespace URI to match, or null to select matching rules regardless of namespace

(String namespaceURI, String pattern)

     * @return a rules list
     */
    protected List<Rule> lookup(String namespaceURI, String pattern) {
        // Optimize when no namespace URI is specified
        List<Rule> list = this.cache.get(pattern);
        if (list == null) {
            return null;
        }
        if (namespaceURI == null || namespaceURI.isEmpty()) {
            return list;
        }

        // Select only Rules that match on the specified namespace URI
        List<Rule> results = new ArrayList<>();
        for (Rule item : list) {
            if ((namespaceURI.equals(item.getNamespaceURI())) || (item.getNamespaceURI() == null)) {
                results.add(item);
            }
        }
        return results;
    }
}