Method lookupPrefix

src/main/java/org/htmlunit/util/XmlUtils.java:377–395

Search for the prefix associated with specified namespace URI. @param element the element to start searching from @param namespace the namespace prefix @return the prefix bound to the namespace URI; or null if there is no such namespace

(final DomElement element, final String namespace)

     * @return the prefix bound to the namespace URI; or null if there is no such namespace
     */
    public static String lookupPrefix(final DomElement element, final String namespace) {
        final Map<String, DomAttr> attributes = element.getAttributesMap();
        for (final Map.Entry<String, DomAttr> entry : attributes.entrySet()) {
            final String name = entry.getKey();
            final DomAttr value = entry.getValue();
            if (name.startsWith("xmlns:") && value.getValue().equals(namespace)) {
                return name.substring(6);
            }
        }
        for (final DomNode child : element.getChildren()) {
            if (child instanceof DomElement domElement) {
                final String prefix = lookupPrefix(domElement, namespace);
                if (prefix != null) {
                    return prefix;
                }
            }
        }
        return null;
    }
}