/**
* Open a copy of the map in read-only mode.
*
* @return the opened map
*/
protected MVMap<K, V> openReadOnly() {
MVMap<K, V> m = new MVMap<K, V>(keyType, valueType);
m.readOnly = true;
HashMap<String, String> config = New.hashMap();
config.put("id", String.valueOf(id));
config.put("createVersion", String.valueOf(createVersion));
m.init(store, config);
m.root = root;
return m;
}
