X-Git-Url: https://git.llucax.com/z.facultad/75.52/treemulator.git/blobdiff_plain/8699d7e1ccbda4282f8ba693422f337be31d100b..44c4c40e48cc4a72e81e0af80842738c45d6116f:/src/btree.cpp

diff --git a/src/btree.cpp b/src/btree.cpp
index 4d28e49..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<BTreeData *> 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<BTreeData *>::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<BTreeData *> new_node_keys;
+		std::list<BTreeData *> 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<BTreeData *>::iterator it = node_keys.begin ();
+		std::list<BTreeData *>::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;
+}
 
-	/* Estoy en una hoja, veo si lo puedo agregar */
+Clave* BTree::AddKeyOtherR (const Clave *k, uint node_num, uint &left_child, uint &right_child)
+{
+	Clave *kout = NULL;
+	std::list<BTreeData *> 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<BTreeData *>::iterator it = node_keys.begin ();
+	std::list<BTreeData *>::iterator posterior;
+	std::list<BTreeData *>::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);
+	}
+
+	/* 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<BTreeData *>::iterator it = node_keys.begin ();
@@ -140,7 +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<BTreeData *> new_node_keys;
 		std::list<BTreeData *> old_node_keys;
@@ -148,19 +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<BTreeData *>::iterator it = node_keys.begin ();
+		std::list<BTreeData *>::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 ())
@@ -196,7 +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);
@@ -250,6 +397,7 @@ std::list<BTreeData *> BTree::ReadKeys (uchar *node, BTreeNodeHeader &node_heade
 {
 	std::list<BTreeData *> keys;
 	node += sizeof (BTreeNodeHeader);
+	uint count = node_header.item_count;
 
 	if (node_header.item_count == 0) return keys;
 
@@ -258,9 +406,10 @@ std::list<BTreeData *> BTree::ReadKeys (uchar *node, BTreeNodeHeader &node_heade
 		BTreeChildData *d = new BTreeChildData (node);
 		node += d->Size ();
 		keys.push_back (d);
+		count--;
 	}
 
-	for (uint i=0; i<node_header.item_count; i++) {
+	for (uint i=0; i<count; i++) {
 		/* TODO : El tipo de clave deberia ser usado 
 		 * dependiendo de algun dato en el header del
 		 * arbol
@@ -315,7 +464,7 @@ void BTree::PrintNode (uint num)
 	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::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;
 }