/*

* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Calendar notifier

*

*/

//system includes

#include <e32property.h>

#include <bacntf.h>                   // CEnvironmentChangeNotifier

#include <coemain.h>                  // EActivePriorityLogonA

//user includes

#include "calendarui_debug.h"

#include "calennotifier.h"            // CalenNotifier

#include "calenstatemachine.h"

const TInt KHashLength = 64;

// ----------------------------------------------------------------------------

// CalenNotifier::CalenNotifier

// C++ default constructor.

// (other items were commented in a header).

// ----------------------------------------------------------------------------

//

CalenNotifier::CalenNotifier( CCalenStateMachine& aStateMachine )

    : iStateMachine( aStateMachine )

    {

    }

// ----------------------------------------------------------------------------

// CalenNotifier::~CalenNotifier

// Destructor.

// (other items were commented in a header).

// ----------------------------------------------------------------------------

//

CalenNotifier::~CalenNotifier()

    {

    // Reset the handler array.

    // Before we reset , close hashset for each handler

    for(TInt i = 0 ; i < iHandlers.Count() ; i++)

        {

        iHandlers[i].iHashSet.Close();

        }

    iHandlers.Reset();

    iBroadcastQueue.Reset();

    // Stop environment change notifications

    if( iEnvChangeNotifier )

        {

        iEnvChangeNotifier->Cancel();

        delete iEnvChangeNotifier;

        }

    }

// ----------------------------------------------------------------------------

// CalenNotifier::ConstructL

// Symbian 2nd phase of construction.

// (other items were commented in a header).

// ----------------------------------------------------------------------------

//

void CalenNotifier::ConstructL()

    {

    // Register for system environment changes

    TCallBack envCallback( EnvChangeCallbackL, this );

    iEnvChangeNotifier =

        CEnvironmentChangeNotifier::NewL( EActivePriorityLogonA, envCallback );

    iEnvChangeNotifier->Start();

    iIgnoreFirstLocaleChange = ETrue;

    }

// ----------------------------------------------------------------------------

// CalenNotifier::RegisterForNotificationsL

// Adds the passed handler to the handler array.

// (other items were commented in a header).

// ----------------------------------------------------------------------------

//

void CalenNotifier::RegisterForNotificationsL( MCalenNotificationHandler* aHandler, 

                                                TCalenNotification aNotification)

    {

    TNotificationHandler handler;

    handler.iHandler = aHandler;

    //Prepare hash

    handler.iHashSet.ReserveL(KHashLength);

    if(ECalenNotifyAll == aNotification)

        {

        //ECalenNotifyAll indicates that all notifications to be registered

        //iterate through TCalenNotification enum and add the notifications to iHashSet

        for(TCalenNotification notificationIter = TCalenNotification(ECalenNotifyAll + 1); 

                                notificationIter < ECalenNotifyLast; 

                                notificationIter = TCalenNotification(notificationIter + 1))

            {

            handler.iHashSet.InsertL(notificationIter);

            }

        }

    else

        {

        //Add only single notification.

        handler.iHashSet.InsertL(aNotification);

        }

    iHandlers.Append( handler );

    }

// ----------------------------------------------------------------------------

// CalenNotifier::RegisterForNotificationsL

// Adds the passed handler to the handler array.

// (other items were commented in a header).

// ----------------------------------------------------------------------------

//

void CalenNotifier::RegisterForNotificationsL( MCalenNotificationHandler* aHandler, 

                                                           RArray<TCalenNotification>& aNotifications  )

    {

    TNotificationHandler handler;

    handler.iHandler = aHandler;

    //Prepare hash

    handler.iHashSet.ReserveL(KHashLength);

    if(aNotifications.Find(ECalenNotifyAll) != KErrNotFound)

        {

        //ECalenNotifyAll indicates that all notifications to be registered

        //If ECalenNotifyAll is found in aNotifications along with other notifications

        //iterate through TCalenNotification enum and add the notifications to iHashSet

        for(TCalenNotification notificationIter = TCalenNotification(ECalenNotifyAll + 1); 

                                    notificationIter < ECalenNotifyLast; 

                                    notificationIter = TCalenNotification(notificationIter + 1))

            {

            handler.iHashSet.InsertL(notificationIter);

            }

        }

    else

        {

        //Add notifocations from Array(aNotifications) into iHashSet member 

        for(TInt i = 0 ; i < aNotifications.Count() ; i++)

            {

            handler.iHashSet.InsertL(aNotifications[i]);

            }

        }

    iHandlers.Append( handler );

    }

// ----------------------------------------------------------------------------

// CalenNotifier::CancelNotifications

// Removes the passed handler from the handler array.

// (other items were commented in a header).

// ----------------------------------------------------------------------------

//

void CalenNotifier::CancelNotifications( MCalenNotificationHandler* aHandler )

    {

    for( TInt x = 0; x < iHandlers.Count(); ++x )

        {

        if( iHandlers[x].iHandler == aHandler )

            {

            // Mark the notification for deletion by

            // settings the handler to NULL. Actual deletion

            // will take place in DoBroadcast

            iHandlers[x].iHashSet.Close();

            iHandlers[x].iHandler = NULL;

            TRACE_EXIT_POINT;

            return;

            }

        }

    }

// ----------------------------------------------------------------------------

// CalenNotifier::ContextChanged

// From MCalenContextChangeObserver. Called when the context changes.

// (other items were commented in a header).

// ----------------------------------------------------------------------------

//

void CalenNotifier::ContextChanged()

    {

    BroadcastNotification( ECalenNotifyContextChanged );

    }

// ----------------------------------------------------------------------------

//  CCalenNotifier::EnvChangeCallbackL

//  CEnvironmentChangeNotifier callback.  Calendar is only interested in:

//  EChangesLocale              - System locale changed

//  EChangesMidnightCrossover   - System time passed midnight

//  EChangesSystemTime          - System time changed

// (other items were commented in a header).

// ----------------------------------------------------------------------------

//

TInt CalenNotifier::EnvChangeCallbackL( TAny* aThisPtr )

    {

    // Return value for functions used as TCallBack objects should be EFalse

    // unless the function is intended to be called again from a timer.

   // return EFalse;

    return static_cast<CalenNotifier*>(aThisPtr)->DoEnvChange();

    }

// ----------------------------------------------------------------------------

//  CCalenNotifier::DoEnvChange

//  EnvChangeCallbackL calls this function

// ----------------------------------------------------------------------------

//

TInt CalenNotifier::DoEnvChange()

    {

    if( ((iEnvChangeNotifier->Change() & EChangesMidnightCrossover)

        || (iEnvChangeNotifier->Change() & EChangesSystemTime))

        && !iIgnoreFirstLocaleChange )

        {

        BroadcastNotification( ECalenNotifySystemTimeChanged );

        }

    else if( (iEnvChangeNotifier->Change() & EChangesLocale)

            && !iIgnoreFirstLocaleChange )  

        {

        BroadcastNotification( ECalenNotifySystemLocaleChanged );

        }

     else

        {

        iIgnoreFirstLocaleChange = EFalse;

        }   

    return EFalse ;

    }

// ----------------------------------------------------------------------------

// CalenNotifier::BroadcastNotification

// Issues a notification to all registered handlers

// (other items were commented in a header).

// ----------------------------------------------------------------------------

//

void CalenNotifier::BroadcastNotification( TCalenNotification aNotification )

    {

    // Someone has told us to broadcast, or one of our notifiers completed.

    // We run it past the state machine and that may or may not call the

    // function to really do the broadcast.

    iStateMachine.HandleNotification( aNotification );

    }

// ----------------------------------------------------------------------------

// CalenNotifier::BroadcastApprovedNotification

// Issues a notification to all registered handlers

// (other items were commented in a header).

// ----------------------------------------------------------------------------

//

void CalenNotifier::BroadcastApprovedNotification( TCalenNotification aNotification )

    {

    iBroadcastQueue.Append( aNotification );

    if( !iBroadcastActive )

        {

        iBroadcastActive = ETrue;

        while( iBroadcastQueue.Count() )

            {

            TCalenNotification notification = iBroadcastQueue[0];

            DoBroadcast( notification );

            iBroadcastQueue.Remove( 0 );

            }

        iBroadcastActive = EFalse;

        }

    }

// ----------------------------------------------------------------------------

// CalenNotifier::DoBroadcast

// Issues a notification to all registered handlers

// (other items were commented in a header).

// ----------------------------------------------------------------------------

//

void CalenNotifier::DoBroadcast( TCalenNotification aNotification )

    {

    for( TInt x = 0; x < iHandlers.Count(); ++x )

        {

        TNotificationHandler handler = iHandlers[x];

        if( handler.iHandler )

            {

             if( handler.iHashSet.Find(aNotification) )

                {

                handler.iHandler->HandleNotification( aNotification );

                }

            }

        else

            {

            // The handler has been marked for deletion

            iHandlers.Remove( x ); // remove the entry

            --x; // decrement the index.

            }

        }

    }

// ----------------------------------------------------------------------------

// CalenNotifier::TNotificationHandler()

// TNotificationHandler contructor

// ----------------------------------------------------------------------------

CalenNotifier::TNotificationHandler::TNotificationHandler() : 

                iHashSet(&::HashCalenNotificationFunction,&::HashCalenNotificationIdentityRelation)

    {

    }

// End of file