X-Git-Url: https://git.llucax.com/z.facultad/75.52/treemulator.git/blobdiff_plain/0997831a9dd5e4359fc70f7f7ff59c1a97132ddc..a857f3426b101f330a2d7baef64b2ff1f1e39bac:/src/btree.cpp?ds=sidebyside diff --git a/src/btree.cpp b/src/btree.cpp index 093377b..1bbb755 100644 --- a/src/btree.cpp +++ b/src/btree.cpp @@ -91,6 +91,19 @@ void BTree::AddKey (const Clave &k) } Clave* BTree::AddKeyR (const Clave *k, uint node_num, uint &left_child, uint &right_child) +{ + uchar *node = ReadBlock (node_num); + BTreeNodeHeader node_header; + ReadNodoHeader (node, &node_header); + delete [] node; + + if (node_header.level == 0) + return AddKeyLeafR (k, node_num, left_child, right_child); + + return AddKeyOtherR (k, node_num, left_child, right_child); +} + +Clave* BTree::AddKeyLeafR (const Clave *k, uint node_num, uint &left_child, uint &right_child) { Clave *kout = NULL; std::list node_keys; @@ -102,26 +115,153 @@ Clave* BTree::AddKeyR (const Clave *k, uint node_num, uint &left_child, uint &ri BTreeNodeHeader node_header; ReadNodoHeader (node, &node_header); - if (node_header.level != 0) { - /* No estoy en una hoja, asi que tengo que buscar - * para donde moverme para agregar la clave - */ - /* TODO :) */ + if (node_header.free_space > data->Size ()) { + BTreeData *datait; node_keys = ReadKeys (node, node_header); std::list::iterator it = node_keys.begin (); + + while (it != node_keys.end ()) { + datait = (*it); + if ((*data) < (*datait)) + /* Me pase, lo agrego aca! */ + break; + it++; + } + node_keys.insert (it, data); + WriteKeys (node, node_header, node_keys); + WriteNodoHeader (node, &node_header); + WriteBlock (node, node_num); + + PrintNode (node_num); + } else { + /* Split : Creo e inicializo el nuevo nodo */ + std::list new_node_keys; + std::list old_node_keys; + BTreeNodeHeader new_node_header; + uint new_node_num; + uchar *new_node = NewBlock (new_node_num); + ReadNodoHeader (new_node, &new_node_header); + new_node_header.level = node_header.level; + + node_keys = ReadKeys (node, node_header); + new_node_keys = ReadKeys (new_node, new_node_header); + + /* Agrego la clave en la lista que ya tengo de manera ordenada */ + std::list::iterator it = node_keys.begin (); + std::list::iterator previt = node_keys.begin (); + + while (it != node_keys.end ()) { + BTreeData *datait; + datait = (*it); + if ((*data) < (*datait)) + /* Me pase, lo agrego aca! */ + break; + previt = it; + it++; + } + if (it != node_keys.end ()) + node_keys.insert (it, data); + else + node_keys.push_back (data); + + /* Tengo que guardar claves hasta ocupar nodo size/2 en cada nodo + * y subir la clave del medio */ + node_header.item_count = 0; + node_header.free_space = header.block_size - sizeof (BTreeNodeHeader); + + uint total_size = 0; + it = node_keys.begin (); + while (it != node_keys.end ()) { + BTreeData *datait; + datait = (*it); + total_size += datait->Size (); + it++; + /* Hack : Si me quedo con todas las claves, en el caso de ser + * del mismo tama#o se desbalancea. Hay que ver que efecto + * puede tener en el caso de claves de long. variable + */ + if (it == node_keys.end ()) + total_size -= datait->Size (); + } + + it = node_keys.begin (); + uint used = 0; + while (used < total_size/2) { + BTreeData *d = (*it); + old_node_keys.push_back (d); + used += d->Size (); + it++; + } + kout = (*it++)->getClave (); // Esta se retorna al "padre" para que se la agregue + + while (it != node_keys.end ()) { + BTreeData *d = (*it); + new_node_keys.push_back (d); + it++; + } - /* Se supone que la primera es un hijo :) */ - //BTreeData *left_child = (*it); + /* Guardo */ + WriteKeys (node, node_header, old_node_keys); + WriteNodoHeader (node, &node_header); + WriteBlock (node, node_num); + WriteKeys (new_node, new_node_header, new_node_keys); + WriteNodoHeader (new_node, &new_node_header); + WriteBlock (new_node, new_node_num); + PrintNode (node_num); - std::cout << "TODO!!" << std::endl; - return NULL; + PrintNode (new_node_num); + + /* Paso los hijos */ + left_child = node_num; + right_child = new_node_num; + delete [] new_node; + delete [] node; + } + + return kout; +} + +Clave* BTree::AddKeyOtherR (const Clave *k, uint node_num, uint &left_child, uint &right_child) +{ + Clave *kout = NULL; + std::list node_keys; + + BTreeData *data = new BTreeLeafData (k->Clone ()); + + /* Leo el nodo raiz para empezar a agregar */ + uchar *node = ReadBlock (node_num); + BTreeNodeHeader node_header; + ReadNodoHeader (node, &node_header); + + node_keys = ReadKeys (node, node_header); + + std::list::iterator it = node_keys.begin (); + std::list::iterator posterior; + std::list::iterator ultima; + + /* Se supone que la primera es un hijo :) */ + BTreeData *lchild = (*it++); + posterior = it; + + while (it != node_keys.end ()) { + if ((*data) < (*(*it))) + break; + ultima = it; + it++; } + if (it == posterior) { + k = AddKeyR (k, lchild->getChild (), left_child, right_child); + } else { + k = AddKeyR (k, (*ultima)->getChild (), left_child, right_child); + } - /* Estoy en una hoja, veo si lo puedo agregar */ + /* Nada que hacer */ + if (!k) return NULL; + + data = new BTreeData (k->Clone (), right_child); if (node_header.free_space > data->Size ()) { - /* TODO : Insertar ordenado */ BTreeData *datait; node_keys = ReadKeys (node, node_header); std::list::iterator it = node_keys.begin (); @@ -131,6 +271,7 @@ Clave* BTree::AddKeyR (const Clave *k, uint node_num, uint &left_child, uint &ri if ((*data) < (*datait)) /* Me pase, lo agrego aca! */ break; + it++; } node_keys.insert (it, data); WriteKeys (node, node_header, node_keys); @@ -139,7 +280,6 @@ Clave* BTree::AddKeyR (const Clave *k, uint node_num, uint &left_child, uint &ri PrintNode (node_num); } else { - std::cout << "=============== SPLIT ================" << std::endl; /* Split : Creo e inicializo el nuevo nodo */ std::list new_node_keys; std::list old_node_keys; @@ -147,19 +287,24 @@ Clave* BTree::AddKeyR (const Clave *k, uint node_num, uint &left_child, uint &ri uint new_node_num; uchar *new_node = NewBlock (new_node_num); ReadNodoHeader (new_node, &new_node_header); + new_node_header.level = node_header.level; node_keys = ReadKeys (node, node_header); new_node_keys = ReadKeys (new_node, new_node_header); /* Agrego la clave en la lista que ya tengo de manera ordenada */ std::list::iterator it = node_keys.begin (); + std::list::iterator previt = node_keys.begin (); + previt = ++it; + while (it != node_keys.end ()) { BTreeData *datait; datait = (*it); if ((*data) < (*datait)) /* Me pase, lo agrego aca! */ break; + previt = it; it++; } if (it != node_keys.end ()) @@ -195,7 +340,10 @@ Clave* BTree::AddKeyR (const Clave *k, uint node_num, uint &left_child, uint &ri used += d->Size (); it++; } - kout = (*it++)->getClave (); // Esta se retorna al "padre" para que se la agregue + kout = (*it)->getClave (); // Esta se retorna al "padre" para que se la agregue + + new_node_keys.push_back ( new BTreeChildData ((*it)->getChild ())); + it++; while (it != node_keys.end ()) { BTreeData *d = (*it); new_node_keys.push_back (d); @@ -315,8 +463,9 @@ void BTree::PrintNode (uint num) std::cout << "Items : " << node_header.item_count << std::endl; std::cout << "Free : " << node_header.free_space << " (" << (header.block_size - sizeof (BTreeNodeHeader)) << ")" << std::endl; while (it != node_keys.end ()) { - std::string s = (*it); - std::cout << "(" << s << ") "; + std::string s = *(*it); + std::cout << s << " "; + it++; } std::cout << std::endl; @@ -340,7 +489,7 @@ uchar *BTree::NewBlock (uint &num) nh.free_space = header.block_size - sizeof (BTreeNodeHeader); nh.item_count = 0; WriteNodoHeader (node, &nh); - WriteBlock (node, 0); + WriteBlock (node, num); return node; }