def split_block(self, block):
index_nodes = block.get_index_nodes()
median = int(len(index_nodes)/2 - 1)
median_node = index_nodes[median]
new_block = IndexBlock(self.get_free_block_pointer(), self._index_name, self._index_directory)
new_block.create_dummy_node()
i = 0
while i < median:
new_block.add_index_node(index_nodes[i])
i += 1
new_block.get_index_nodes()[-1].set_index_block_pointer(median_node.get_index_block_pointer())
i = 0
while i <= median:
block.delete_index_node(index_nodes[0])
i += 1
new_block.update_child_blocks(self._fd)
median_node.set_index_block_pointer(new_block.get_location())
new_block.set_parent_block(block.get_parent_block())
return new_block, median_node
