public OrderedMapIterator<K, V> orderedMapIterator() {
        return new ListOrderedMapIterator<K, V>(this);
    }
Read the map in using a custom routine.

@param in the input stream
@throws java.io.IOException
@throws ClassNotFoundException
@since Commons Collections 3.1
jphp-runtime/src/php/runtime/common/collections/map/ListOrderedMap.java