/*
 $Id: kwdsstorage.h 5795 2010-10-23 01:18:03Z abehm $
 
 Copyright (C) 2010 by The Regents of the University of California
 
 Redistribution of this file is permitted under
 the terms of the BSD license.
 
 Date: 08/19/2010
 Author: Sattam Alsubaiee <salsubai (at) ics.uci.edu>
*/

#include <iostream>
#include <fstream>
#include <string>
#include <cstdlib>
#include <tr1/unordered_map>

using namespace std;
using namespace tr1;

struct IndexNode
{
	unsigned position;
	size_t size;
	unsigned id;
	unsigned numKeywords;
};

class KeywordsFile
{
private:
	char *buffer;
	fstream keywordsFile;
	string keywordsFileName;
	unordered_map<unsigned, IndexNode> indexMap;
	
	void readIndex(string indexFileName, bool newFile);
    void writeIndex(); 
public:
	KeywordsFile(string fileName);
	~KeywordsFile();
	unordered_map <unsigned, IndexNode>::iterator begin();
	unordered_map <unsigned, IndexNode>::iterator end();
	IndexNode getIndexNode(unsigned id);
	bool open(bool newFile = false);
	string read(unsigned id);
	bool write(string text, unsigned id, unsigned numKeywords);
	void close();
	unsigned getRecordCount();
};