@Nullable
private BidirectionalMap<String, String> computeNamespaceMap(PsiElement parent) {
BidirectionalMap<String, String> map = null;
if (hasNamespaceDeclarations()) {
map = new BidirectionalMap<String, String>();
final XmlAttribute[] attributes = getAttributes();
for (final XmlAttribute attribute : attributes) {
if (attribute.isNamespaceDeclaration()) {
final String name = attribute.getName();
int splitIndex = name.indexOf(':');
final String value = getRealNs(attribute.getValue());
if (value != null) {
if (splitIndex < 0) {
map.put("", value);
} else {
map.put(XmlUtil.findLocalNameByQualifiedName(name), value);
}
}
}
}
}
if (parent instanceof XmlDocument) {
final XmlExtension extension = XmlExtension.getExtensionByElement(parent);
if (extension != null) {
final String[][] defaultNamespace =
extension.getNamespacesFromDocument((XmlDocument) parent, map != null);
if (defaultNamespace != null) {
if (map == null) {
map = new BidirectionalMap<String, String>();
}
for (final String[] prefix2ns : defaultNamespace) {
map.put(prefix2ns[0], getRealNs(prefix2ns[1]));
}
}
}
}
return map;
}
