ConnectionParameterViewer.cpp

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/***************************************************************************
 *   SpikeStream Application                                               *
 *   Copyright (C) 2007 by David Gamez                                     *
 *   david@davidgamez.eu                                                   *
 *   Version 0.1                                                           *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

//SpikeStream includes
#include "ConnectionParameterViewer.h"
#include "Debug.h"

//Qt includes
#include <qmessagebox.h>
#include <qpushbutton.h>
#include <qlabel.h>

//Other includes
#include <string>
#include <mysql++.h>
using namespace std;
using namespace mysqlpp;

//Local debug defines
//#define XML_PARSE_DEBUG


/*! Constructor. */
ConnectionParameterViewer::ConnectionParameterViewer(QWidget* parent, DBInterface* netDBInter, unsigned int cGrpID) : QDialog(parent){
        //Store references and information passed in constructor
        networkDBInterface = netDBInter;
        connGrpID = cGrpID;

        //Set the caption
        QString captionStr = "Connection Group Parameters [";
        captionStr += QString::number(connGrpID);
        captionStr += "]";
        this->setCaption(captionStr);

        //Create a vertical box to organise the layout
        mainVerticalBox = new QVBoxLayout(this, 5, 10, "vertical");

        //Error state is used to track any errors during start up
        errorState = false;

        //Make it non modal
        this->setModal(false);
        
        //Load up XML string from database and parse it if it is not null
        string paramXmlString("");
        try{
                Query query = networkDBInterface->getQuery();
                query.reset();
                query<<"SELECT Parameters FROM ConnectionGroups WHERE ConnGrpID = "<<connGrpID;
                Result paramRes = query.store();
                Row paramRow(*paramRes.begin());//ConnGrpID is unique so will be only one row.
                paramXmlString = (std::string) paramRow["Parameters"];
        }
    catch (const BadQuery& er) {// Handle any query errors
                cerr<<"ConnectionParameterViewer: MYSQL QUERY EXCEPTION \""<<er.what()<<"\""<<endl;
                QString errorString = "Bad query selecting connection parameters: \"";
                errorString += er.what();
                errorString += "\"";
                QMessageBox::critical( 0, "Connection Parameter Error", errorString);
                errorState = true;
                return;
    }
    catch (const Exception& er) {// Catch-all for any other MySQL++ exceptions
        cerr<<"ConnectionParameterViewer: MYSQL EXCEPTION \""<<er.what()<<"\""<<endl;
                QString errorString = "Exception thrown selecting network parameters: \"";
                errorString += er.what();
                errorString += "\"";
                QMessageBox::critical( 0, "Connection Parameter Error", errorString);
                errorState = true;
                return;
    }

        QXmlSimpleReader xmlReader;
        QXmlInputSource xmlInput;
        xmlReader.setContentHandler(this);
        xmlReader.setErrorHandler(this);

        if(paramXmlString != "NULL" && paramXmlString != ""){
                xmlInput.setData(paramXmlString);
                xmlReader.parse(xmlInput);
                if(parseError){
                        QMessageBox::critical( 0, "Error Parsing Connection Parameters", parseErrorString);
                        errorState = true;
                        return;
                }
        }
        else{
                currentHBox = new QHBoxLayout();
                currentHBox->addWidget(new QLabel("No parameters stored.", this));
                currentHBox->addStretch(5);
                mainVerticalBox->addLayout(currentHBox);
        }
        mainVerticalBox->addStretch(5);

        //Set up buttons
        QHBoxLayout *buttonBox = new QHBoxLayout();
        QPushButton *okButton = new QPushButton("Ok", this);
        buttonBox->addWidget(okButton);
        connect (okButton, SIGNAL(clicked()), this, SLOT(okButtonPressed()));

        QPushButton *cancelButton = new QPushButton("Cancel", this);    
        buttonBox->addWidget(cancelButton);
        connect (cancelButton, SIGNAL(clicked()), this, SLOT(cancelButtonPressed()));
        mainVerticalBox->addLayout(buttonBox);

        //Make viewer visible           
        this->resize(400, 200);
}


/*! Destructor. */
ConnectionParameterViewer::~ConnectionParameterViewer(){
        #ifdef MEMORY_DEBUG
                cout<<"DESTROYING CONNECTION PARAMETER VIEWER"<<endl;
        #endif//MEMORY_DEBUG
}


//-------------------------------------------------------------------------
//-------------------------   PUBLIC METHODS  -----------------------------
//-------------------------------------------------------------------------

bool ConnectionParameterViewer::loadError(){
        return errorState;
}


//-------------------------------------------------------------------------
//------------------------- PROTECTED METHODS -----------------------------
//-------------------------------------------------------------------------

/*! Called when parser encounters characters. */
bool ConnectionParameterViewer::characters(const QString& chars){
        #ifdef XML_PARSE_DEBUG
                cout<<"Characters: "<<chars<<" in element "<<currentElement<<endl;
        #endif//XML_PARSE_DEBUG
        if(currentElement == "description"){
                currentHBox->addWidget(new QLabel(chars, this));
        }
        else if(currentElement == "value"){
                currentHBox->addWidget(new QLabel(chars, this));
                currentHBox->addStretch(5);
                mainVerticalBox->addLayout(currentHBox);
        }
        else if(currentElement == "min_delay"){
                currentHBox = new QHBoxLayout();
                currentHBox->addWidget(new QLabel("Delay range: Min", this));
                currentHBox->addWidget(new QLabel(chars, this));
        }
        else if(currentElement == "max_delay"){
                currentHBox->addWidget(new QLabel("Max", this));
                currentHBox->addWidget(new QLabel(chars, this));
                currentHBox->addStretch(5);
                mainVerticalBox->addLayout(currentHBox);
        }
        else{
                parseError = true;
                parseErrorString += "Unrecognized element.";
                cerr<<"ConnectionParameterViewer: UNRECOGNIZED ELEMENT"<<endl;
        }
        return true;
}


/*! Called when the parser encounters the end of an element. */
bool ConnectionParameterViewer::endElement( const QString&, const QString&, const QString& qName){
        #ifdef XML_PARSE_DEBUG
                cout<<"End element: "<<qName<<endl;
        #endif//XML_PARSE_DEBUG
        return true;
}


/*! Called when the parser generates an error. */
bool ConnectionParameterViewer::error ( const QXmlParseException& parseEx){
        cerr<<"ConnectionParameterViewer: PARSING ERROR"<<endl;
        parseError = true;
        parseErrorString += parseEx.message();
        return true;
}


/*! Returns a default error string. */
QString ConnectionParameterViewer::errorString (){
        return QString("ConnectionParameterViewer: Default error string");

}


/*! Called when the parser generates a fatal error. */
bool ConnectionParameterViewer::fatalError ( const QXmlParseException& parseEx){
        cerr<<"ConnectionParameterViewer: PARSING FATAL ERROR"<<endl;
        parseError = true;
        parseErrorString += parseEx.message();
        return true;
}


/*! Called when parser reaches the start of the document. */
bool ConnectionParameterViewer::startDocument(){
        parseError = false;
        parseErrorString = "";
        return true;
}


/*! Called when parser reaches the start of an element. */
bool ConnectionParameterViewer::startElement(const QString&, const QString&, const QString& qName, const QXmlAttributes&){
        #ifdef XML_PARSE_DEBUG
                cout<<"Start element: "<<qName<<endl;
        #endif//XML_PARSE_DEBUG
        currentElement = qName;
        if(currentElement == "parameter"){
                currentHBox = new QHBoxLayout();
        }
        return true;
}


/*! Called when the parser generates a warning. */
bool ConnectionParameterViewer::warning ( const QXmlParseException& ){
        cerr<<"ConnectionParameterViewer: PARSING WARNING"<<endl;
        return true;
}


//-------------------------------------------------------------------------
//-------------------------   PRIVATE SLOTS   -----------------------------
//-------------------------------------------------------------------------

/*! Hides the dialog. */
void ConnectionParameterViewer::cancelButtonPressed(){
        this->accept();
}


/*! Hides the dialog. */
void ConnectionParameterViewer::okButtonPressed(){
        this->accept();
}

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