X-Git-Url: https://git.llucax.com/z.facultad/75.52/treemulator.git/blobdiff_plain/6d948f6bdab2bb66cd5eb8046ec67ca9b3ab76c1..e642d903800bc569707379b4a7f48293077d3c99:/src/btree.cpp?ds=sidebyside

diff --git a/src/btree.cpp b/src/btree.cpp
index a285392..ef48fef 100644
--- a/src/btree.cpp
+++ b/src/btree.cpp
@@ -6,7 +6,7 @@ BTree::BTree (const std::string &name, unsigned int block_size, bool create_new_
 	uchar *node;
 	BTreeNodeHeader nh;
 
-	fp = fopen (name.c_str(), "wb");
+	fp = fopen (name.c_str(), "wb+");
 	if (!fp) {
 		/* TODO : mandar una exception ? */
 		return;
@@ -17,7 +17,7 @@ BTree::BTree (const std::string &name, unsigned int block_size, bool create_new_
 	
 	/* Inicializo el header */
 	header.block_size = block_size;
-	write_tree_header ();
+	WriteFileHeader ();
 
 	/* Creo el primer bloque vacio */
 	node = new uchar[block_size];
@@ -26,7 +26,7 @@ BTree::BTree (const std::string &name, unsigned int block_size, bool create_new_
 	nh.free_space = block_size - sizeof (BTreeNodeHeader);
 	nh.item_count = 0;
 	WriteNodoHeader (node, &nh);
-	write_block (node, 0);
+	WriteBlock (node, 0);
 
 	delete [] node;
 }
@@ -36,35 +36,58 @@ BTree::~BTree ()
 	fclose (fp);
 }
 
-void BTree::write_tree_header ()
+void BTree::WriteFileHeader ()
 {
 	fseek (fp, 0L, SEEK_SET);
 	fwrite (&header, 1, sizeof (BTreeFileHeader), fp);
 }
 
-void BTree::write_block (uchar *block, uint num)
+void BTree::WriteBlock (uchar *block, uint num)
 {
 	fseek (fp, num*header.block_size + sizeof (BTreeFileHeader), SEEK_SET);
 	fwrite (block, 1, header.block_size, fp);
 }
 
-void BTree::AddKey (Clave &k)
+void BTree::AddKey (const Clave &k)
 {
+	AddKeyR (&k, 0);
+}
+
+Clave* BTree::AddKeyR (const Clave *k, uint node_num)
+{
+	Clave *kout = NULL;
+	std::list<BTreeData> node_keys;
+
 	/* Leo el nodo raiz para empezar a agregar */
-	uchar *root = ReadBlock (0);
-	BTreeNodeHeader root_header;
-	ReadNodoHeader (root, &root_header);
+	uchar *node = ReadBlock (node_num);
+	BTreeNodeHeader node_header;
+	ReadNodoHeader (node, &node_header);
+
+	BTreeLeafData data (k->Clone ());
+
+	if (node_header.free_space > data.Size ()) {
+		/* TODO : Insertar ordenado */
+		node_keys = ReadKeys (node, node_header);
+		node_keys.push_back (data);
 
-	if (root_header.free_space >= k.Size ()) {
-		std::cout << "Hay lugar para meter la clave" << std::endl;
+		WriteKeys (node, node_header, node_keys);
+		WriteNodoHeader (node, &node_header);
+		WriteBlock (node, node_num);
 	} else {
-		std::cout << "__NO__ hay lugar para meter la clave" << std::endl;
+		/* Split */
+		/* Lo que debe pasar :
+		 *  1) Separar N/2 claves en "nodo"
+		 *  2) Separar N/2-1 claves en un nuevo nodo
+		 *  3) kout = clave del medio y mandarla al padre
+		 */
+		std::cout << "SPLIT" << std::endl;
+		delete [] node;
 	}
 
-	delete [] root;
+	return kout;
 }
 
-void BTree::DelKey (Clave &k) {}
+void BTree::DelKey (const Clave &k) {}
 
 void BTree::ReadNodoHeader (uchar *node, BTreeNodeHeader *header)
 {
@@ -86,3 +109,66 @@ uchar *BTree::ReadBlock (uint num)
 	return out;
 }
 
+std::list<BTreeData> BTree::ReadKeys (uchar *node, BTreeNodeHeader &node_header)
+{
+	std::list<BTreeData> keys;
+	node += sizeof (BTreeNodeHeader);
+
+	for (uint i=0; i<node_header.item_count; i++) {
+		/* TODO : El tipo de clave deberia ser usado 
+		 * dependiendo de algun dato en el header del
+		 * arbol
+		 */
+		/* TODO : Detectar si estoy en una hoja */
+		BTreeData data;
+		if (node_header.level == 0)
+			data = BTreeLeafData (node);
+		else
+			data = BTreeData (node);
+		node += data.Size ();
+		keys.push_back (data);
+	}
+
+	return keys;
+}
+
+void BTree::WriteKeys (uchar *node, BTreeNodeHeader &node_header, std::list<BTreeData> &keys)
+{
+	std::list<BTreeData>::iterator it = keys.begin ();
+
+	node += sizeof (BTreeNodeHeader);
+
+	node_header.item_count = 0;
+	node_header.free_space = header.block_size - sizeof (BTreeNodeHeader);
+
+	while (it != keys.end ()) {
+		BTreeData d = (*it);
+		memcpy (node, d.ToArray(), d.Size ());
+		node += d.Size ();
+		node_header.free_space -= d.Size ();
+		node_header.item_count++;
+		it++;
+	}
+
+	/* TODO : incrementar node_header.item_count aca o fuera de este metodo? */
+}
+		
+void BTree::PrintNode (uint num)
+{
+	uchar *node = ReadBlock (num);
+	BTreeNodeHeader node_header;
+	ReadNodoHeader (node, &node_header);
+		
+	std::list<BTreeData> node_keys = ReadKeys (node, node_header);
+	std::list<BTreeData>::iterator it = node_keys.begin ();
+
+	std::cout << "Nodo  : " << num << std::endl;
+	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::cout << std::endl;
+}
+