/*
 * Btree.h
 *
 *  Created on: 2014-4-18
 *      Author: liyouhuan
 */

#ifndef BTREE_H_
#define BTREE_H_
#include "CBtreeH.h"
#include<iostream>
#include<fstream>
#include<sstream>
using namespace std;
class bstr{
public:
	char* str;
	int len;
	bstr(const char * _s, int _len){
		str = new char[_len+1];
		memcpy(str, _s, _len*sizeof(char));
		str[_len] = '\0';
		len = _len;
	}
	bstr(FILE*& _fp){
		fread((char*)&len, sizeof(int), 1, _fp);
		str = new char[len+1];
		fread(str, sizeof(char), len, _fp);
		str[len]='\0';
	}
	void b_write(ofstream& _of){
		_of.write((char*)&len, sizeof(int));
		_of.write(str, len*sizeof(char));
	}
	void b_write(FILE* _fp){
		fwrite((char*)&len, sizeof(int), 1, _fp);
		fwrite(str, sizeof(char), len, _fp);
	}
	const char* cstr()const{
		return str;
	}
	~bstr(){
		delete[] str;
	}
};

class Btree{
public:
	//mode = r w rw
	Btree(const string& _store_path, const string& _file_name, const char* _mode);
	~Btree();
	bool insert(const bstr& _key, const bstr& _val);
	bool insert(const char* _key, int _klen, const char* _val, int _vlen);
	bool search(const char* _key, int _klen, char*& _val, int & _vlen)const;
	bool search(const char* _key, int _klen);
	const bstr* getValueTransfer();
	bool remove(const bstr& _key);
	bool remove(const char* _key, int _klen);
	bool close();
	bool flush();
	bool release();
private:
	string getBtreeFilePath(){
		return storePath+"/"+fileName;
	}
	bool deleteifExistPath(const string& _path);
	bool openRead(const string& _btree_path);
	bool openWrite(const string& _btree_path);
	bool openReadWrite(const string& _btree_path);
private:
	BPlusTree* btree;
	string storePath;
	string fileName;
	string mode;
	bstr* value_transfer;
	int value_transfer_max_len;
};

#endif /* BTREE_H_ */