RSS Reader Plug-in for Internet Explorer

/*
	Project		: RSS Reader plugin for Internet Explorer
	File name	: RRPConfigurationManager.cpp
	Date		: 
	Purpose		: It is the configuration manager.It reads from the config.xml file
				  and provides single point access to configuration settings
	Note		: It is a Singlton class(Implments Singleton Pattern GoF)
	Send comments 
	or Bugs to	: prafulla_t@users.sourceforge.net
*/

#include "StdAfx.h"
#include "RRPConfigurationManager.h"
#include <iostream>




RRPConfigurationManager::RRPConfigurationManager(void) {
	doc = NULL;
	modified = false;
	CRegKey currentVersionRegEntry;
    TCHAR programFilesAddress[2048];
	CString rssDirectory;
    currentVersionRegEntry.Create(HKEY_LOCAL_MACHINE, 
		_T("Software\\Microsoft\\Windows\\CurrentVersion"));
    DWORD length= 2048;
    if(ERROR_SUCCESS ==
		currentVersionRegEntry.QueryValue(programFilesAddress, _T("ProgramFilesDir"),&length)) {
			__configFilePath = CString(programFilesAddress) + _T("\\RssReader for IE\\config.xml");
			rssDirectory = CString(programFilesAddress) + _T("\\RssReader for IE");
	}
	else {
		//C:\\Program Files is taken as default
		__configFilePath = _T("C:\\Program Files\\RssReader for IE\\config.xml");
		rssDirectory = _T("C:\\Program Files\\RssReader for IE");
	}

	configFile = new char[__configFilePath.GetLength() + 1];
	int i = 0;
	for(i = 0;i < __configFilePath.GetLength();i++)
		configFile[i] = __configFilePath[i];
	configFile[i] = '\0';

	rssDir = new char[rssDirectory.GetLength() + 1];
	for(i = 0;i < rssDirectory.GetLength();i++)
		rssDir[i] = rssDirectory[i];
	rssDir[i] = '\0';
	
	OFSTRUCT fileInformation;
	//Checking if the file exists
	fileHandle = ::OpenFile(configFile,&fileInformation,OF_READ);
	GetFileTime(reinterpret_cast<HANDLE>(fileHandle),&creationOld,&lastAccessedOld,&lastWriteOld);
	if(fileHandle == HFILE_ERROR) {
		//Creating directory if it does not exist
		::CreateDirectory(rssDirectory,NULL);
		rssDirectory += _T("\\rss");
		::CreateDirectory(rssDirectory,NULL);
		::CloseHandle(reinterpret_cast<HANDLE>(fileHandle));
		fileHandle = ::OpenFile(configFile,&fileInformation,OF_CREATE);
		GetFileTime(reinterpret_cast<HANDLE>(fileHandle),&creationOld,&lastAccessedOld,&lastWriteOld);
		::CloseHandle(reinterpret_cast<HANDLE>(fileHandle));
		writeDefaultConfigurationFile();
	}
	::CloseHandle(reinterpret_cast<HANDLE>(fileHandle));
	//Parse it up
	parse();
	toolbar = NULL;

	//We'll not delete all the files on closing of IE,by default
	//But if any of the button settings is modified we will delete them to ensure that
	//next IE instance do not show wrong news
	deleteOnCloseFlag = false;
}


RRPConfigurationManager::~RRPConfigurationManager(void) {
	OFSTRUCT fileInformation;
	fileHandle = ::OpenFile(configFile,&fileInformation,OF_READ);
	FILETIME lastWrite;
	FILETIME creation;
	FILETIME lastAccessed;
	GetFileTime(reinterpret_cast<HANDLE>(fileHandle),&creation,&lastAccessed,&lastWrite);
	::CloseHandle(reinterpret_cast<HANDLE>(fileHandle));
	//Ensuring that changes made by some recent process are not 
	//lost by this process
	if((lastWrite.dwLowDateTime == lastWriteOld.dwLowDateTime)  &&
		lastWrite.dwHighDateTime == lastWriteOld.dwHighDateTime)
	writeConfigurationFile();
	int n = newsButtonVector.size();
	for(int i = 0;i<n;i++)
		delete newsButtonVector[i];
	if(doc)
		delete doc;
	if(configFile)
		delete configFile;
	if(rssDir)
		delete rssDir;
}

//Returns the Installation directory
char *RRPConfigurationManager::getInstallationDirectory() {
	return rssDir;
}

void RRPConfigurationManager::writeDefaultConfigurationFile() {
	TiXmlDocument defaultDoc = TiXmlDocument();

	TiXmlComment *title = new TiXmlComment("Configuration file for RSS Reader plugin for IE");
	TiXmlComment *author = new TiXmlComment("Author : Prafulla Tekawade(prafulla_t@users.sourceforge.net)");
	TiXmlElement *rssReader = new TiXmlElement("rss-reader");
	
	TiXmlElement *newsItem = new TiXmlElement("news-item");
	TiXmlElement *titleElement = new TiXmlElement("title");
	titleElement->LinkEndChild(new TiXmlText("Top Stories"));
	TiXmlElement *linkElement = new TiXmlElement("link");
	linkElement->LinkEndChild(new TiXmlText("http://www.ibnlive.com/xml/top.xml"));
	newsItem->LinkEndChild(titleElement);
	newsItem->LinkEndChild(linkElement);
	rssReader->LinkEndChild(newsItem);

	newsItem = new TiXmlElement("news-item");
	titleElement = new TiXmlElement("title");
	titleElement->LinkEndChild(new TiXmlText("World News"));
	linkElement = new TiXmlElement("link");
	linkElement->LinkEndChild(new TiXmlText("http://www.ibnlive.com/xml/world.xml"));
	newsItem->LinkEndChild(titleElement);
	newsItem->LinkEndChild(linkElement);
	rssReader->LinkEndChild(newsItem);

	newsItem = new TiXmlElement("news-item");
	titleElement = new TiXmlElement("title");
	titleElement->LinkEndChild(new TiXmlText("Business"));
	linkElement = new TiXmlElement("link");
	linkElement->LinkEndChild(new TiXmlText("http://www.ibnlive.com/xml/business.xml"));
	newsItem->LinkEndChild(titleElement);
	newsItem->LinkEndChild(linkElement);
	rssReader->LinkEndChild(newsItem);

	newsItem = new TiXmlElement("news-item");
	titleElement = new TiXmlElement("title");
	titleElement->LinkEndChild(new TiXmlText("India"));
	linkElement = new TiXmlElement("link");
	linkElement->LinkEndChild(new TiXmlText("http://www.ibnlive.com/xml/india.xml"));
	newsItem->LinkEndChild(titleElement);
	newsItem->LinkEndChild(linkElement);
	rssReader->LinkEndChild(newsItem);

	newsItem = new TiXmlElement("news-item");
	titleElement = new TiXmlElement("title");
	titleElement->LinkEndChild(new TiXmlText("Latest Articles"));
	linkElement = new TiXmlElement("link");
	linkElement->LinkEndChild(new TiXmlText("http://www.codeproject.com/webservices/articlerss.aspx?cat=1"));
	newsItem->LinkEndChild(titleElement);
	newsItem->LinkEndChild(linkElement);
	rssReader->LinkEndChild(newsItem);
	
	defaultDoc.LinkEndChild(title);
	defaultDoc.LinkEndChild(author);
	defaultDoc.LinkEndChild(rssReader);

	defaultDoc.SaveFile(configFile);
//	::WriteFile(reinterpret_cast<HANDLE>(fileHandle),text,strlen(text),&numberOfBytesWritten,NULL);
}

//Writes configuration file
void RRPConfigurationManager::writeConfigurationFile() {

	TiXmlDocument defaultDoc = TiXmlDocument();

	TiXmlComment *title = new TiXmlComment("Configuration file for RSS Reader plugin for IE");
	TiXmlComment *author = new TiXmlComment("Author : Prafulla Tekawade(prafulla_t@users.sourceforge.net)");
	TiXmlElement *rssReader = new TiXmlElement("rss-reader");
	TiXmlElement *newsItem;
	
	int n = newsButtonVector.size();
	for(int i = 0;i<n;i++) {
		if(newsButtonVector[i]) {
			newsItem = new TiXmlElement("news-item");
			TiXmlElement *titleElement = new TiXmlElement("title");
			titleElement->LinkEndChild(new TiXmlText(newsButtonVector[i]->title));
			TiXmlElement *linkElement = new TiXmlElement("link");
			linkElement->LinkEndChild(new TiXmlText(newsButtonVector[i]->link));
			newsItem->LinkEndChild(titleElement);
			newsItem->LinkEndChild(linkElement);
			rssReader->LinkEndChild(newsItem);
		}
	}
	defaultDoc.LinkEndChild(title);
	defaultDoc.LinkEndChild(author);
	defaultDoc.LinkEndChild(rssReader);
	defaultDoc.SaveFile(configFile);
}

void RRPConfigurationManager::parse() {
	if(doc) {
		delete doc;
		doc = NULL;
	}
	doc = new TiXmlDocument(configFile);
	doc->LoadFile();
	if(doc->Error())
		return;
	TiXmlElement *rootElement = doc->FirstChildElement();
	TiXmlElement *newsItemElement;
	TiXmlElement *titleElement,*linkElement;

	newsItemElement = rootElement->FirstChildElement("news-item");

	//Traversing all news item tags
	while(newsItemElement) {
		NewsButtonInfo *obj = new NewsButtonInfo();
	
		titleElement = newsItemElement->FirstChildElement("title");
		linkElement = newsItemElement->FirstChildElement("link");
		obj->title = const_cast<char *>(titleElement->GetText());
		obj->link = const_cast<char *>(linkElement->GetText());
		if(!obj->title) {
			obj->title = new char[10];
			strcpy(obj->title,"No-Title");
		}
		if(!obj->link) {
			obj->link = new char[20];
			strcpy(obj->link,"http://No-Link");		
		}
		newsButtonVector.push_back(obj);
		//std::cout << titleElement->GetText() << std::endl;
		//std::cout << linkElement->GetText() << std::endl;

		newsItemElement = newsItemElement->NextSiblingElement();
	}
}

//Add the news to the News Vector
void RRPConfigurationManager::addNews(char *title,char *link) {
	NewsButtonInfo *obj = new NewsButtonInfo();
	obj->title = new char[strlen(title) + 1];
	strcpy(obj->title,title);

	obj->link = new char[strlen(link) + 1];
	strcpy(obj->link,link);
	newsButtonVector.push_back(obj);

	toolbar->addButton(getSize() - 1);

}

//Modifies the news at the specified index
void RRPConfigurationManager::modifyNews(int index,char *title,char *link) {
	modified = true;
	deleteOnCloseFlag = true;
	NewsButtonInfo *obj = newsButtonVector[index];
	if(title) {
		obj->title = new char[strlen(title) + 1];
		strcpy(obj->title,title);
	}
	if(link) {
		obj->link = new char[strlen(link) + 1];
		strcpy(obj->link,link);
	}
	newsButtonVector[index] = obj;
	toolbar->changeButtonCaption(index,title);

}

//Removes the news from the specified index
void RRPConfigurationManager::removeNews(unsigned int index) {
	unsigned int n = newsButtonVector.size();
	if(index < n) {
		delete newsButtonVector[index];
		newsButtonVector[index] = NULL;
		std::vector<NewsButtonInfo *>::iterator it = newsButtonVector.begin();
		int i = 0;
		while(i != index) {
			if(i > newsButtonVector.size())
				break;
			it++;
			i++;
		}
		newsButtonVector.erase(it);
	}
}