def add_index(self, index_node, block=None): key = index_node.get_key() root_block_location = self.get_root_block() if block is None: block = self.find_leaf_block(key, root_block_location) parent = block.get_parent_block() block.add_index_node(index_node) if block.get_size() < self._block_size: block.write_block(self._fd) if root_block_location == -1: self.set_root_block(block.get_location()) return new_block, median_node = self.split_block(block) if parent != -1: parent = IndexBlock(parent, self._index_name, self._index_directory) parent.read_block(self._fd) block.write_block(self._fd) new_block.write_block(self._fd) self.add_index(median_node, parent) else: root_block = IndexBlock(self.get_free_block_pointer(), self._index_name, self._index_directory) root_block.create_dummy_node() root_block.get_index_nodes()[-1].set_index_block_pointer(block.get_location()) root_block.add_index_node(median_node) block.set_parent_block(root_block.get_location()) new_block.set_parent_block(root_block.get_location()) self.set_root_block(root_block.get_location()) root_block.write_block(self._fd) new_block.write_block(self._fd) block.write_block(self._fd)
def delete_index_node(self, index_node): block, index_node = self.find_index_block(index_node) if block is None: print("Fail") return successor_block, successor_node = self.find_successor(block, index_node) if block == successor_block: successor_node.set_index_block_pointer(index_node.get_index_block_pointer()) block.delete_index_node(index_node) if len(block.get_index_nodes()) == 1: if block.get_location() != self.get_root_block(): parent_location = block.get_parent_block() if parent_location != -1: parent = IndexBlock(parent_location, self._index_name, self._index_directory) parent.read_block(self._fd) for node in parent.get_index_nodes(): if node.get_index_block_pointer() == block.get_location(): node.set_index_block_pointer(block.get_index_nodes()[0].get_index_block_pointer()) parent.update_child_blocks(self._fd) parent.write_block(self._fd) block.delete_block(self._fd, self.get_free_block_pointer()) else: block.write_block(self._fd) else: block.write_block(self._fd) else : successor_block.delete_index_node(successor_node) block.delete_index_node(index_node) successor_node.set_index_block_pointer(index_node.get_index_block_pointer()) block.add_index_node(successor_node) block.write_block(self._fd) if len(successor_block.get_index_nodes()) == 1: if successor_block.get_location() != self.get_root_block(): parent_location = successor_block.get_parent_block() if parent_location != -1: parent = IndexBlock(parent_location, self._index_name, self._index_directory) parent.read_block(self._fd) for node in parent.get_index_nodes(): if node.get_index_block_pointer() == successor_block.get_location(): node.set_index_block_pointer(successor_block.get_index_nodes()[0].get_index_block_pointer()) parent.update_child_blocks(self._fd) parent.write_block(self._fd) successor_block.delete_block(self._fd, self.get_free_block_pointer()) else: successor_block.write_block(self._fd) else: successor_block.write_block(self._fd)