// Copyright (c) 2008-2009 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:

//

#ifndef OPERATIONS_H

#define OPERATIONS_H

#include <e32debug.h>

#include <e32std.h>

#include "datatype.h"

/**

This class encapsulates the operation logic used in both the client-server and the PC side library. The MOperationLogic

defines a set of pure virtual functions to be implemented. Currently the two classes responsible for performing operations

respectively are the CServerRepository and the CPcRepImpl

@internalTechnology

*/

class MOperationLogic

	{

	public:

/** DELETE RANGE

Delete a settings from a source list. Settings are marked as deleted rather than deleted immediately

@param aSourceList the source array of settings's pointer matching the partial key and mask

@param aPartialKey the partialKey of the settings to be delted

@param aErrorKey to hold the error encountered during the Delete operation

*/

void DeleteSettingsRangeL(RSettingPointerArray& aSourceList,TUint32 aPartialKey,TUint32& aErrorKey)

	{

	if (aSourceList.Count()==0)	

		{

		aErrorKey=aPartialKey;		

		User::Leave(KErrNotFound);

		}

	aErrorKey = KUnspecifiedKey;

	TInt numSettings = aSourceList.Count();

	TInt error=KErrNone;		

	for (TInt i = 0; (i < numSettings) && (error == KErrNone); i++)

		{

		ASSERT(aSourceList[i]);

		TServerSetting& settingToDelete = *(aSourceList[i]);

		TUint32 key = settingToDelete.Key();

		// delete it Ensure there is a delete placeholder at the location

		if (GetWritableSettingList().Find(key) == &settingToDelete)

			{

			// we are deleting a setting that is already in the transaction list: Flag it as deleted

			settingToDelete.Reset();

			settingToDelete.SetDeleted();

			}

		else

			{

			// create a new placeholder and set as deleted

			TServerSetting newSetting(key);

			newSetting.SetMeta(settingToDelete.Meta());

			newSetting.SetDeleted();

			GetWritableSettingList().OrderedInsertL(newSetting);

			}

		}	

	}

/** DELETE

Mark a setting in the source list as deleted if found

@param aId the setting Id to be deleted

@param aSettingList the list of source setting to look for

*/

void DeleteSettingL(TUint32 aId)

	{

	TServerSetting* ts=GetWritableSettingList().Find(aId);

	if (ts)

		{

		if (ts->IsDeleted())

			User::Leave(KErrNotFound);

		else

			{

			ts->Reset();

			ts->SetDeleted();	

			}

		}

	else

		{

		TServerSetting* s=GetSetting(aId);

		if (!s)	

			User::Leave(KErrNotFound);

		else

			{

			TServerSetting newSetting(aId);

			newSetting.SetMeta(s->Meta());

			newSetting.SetDeleted();

			GetWritableSettingList().OrderedInsertL(newSetting);

			}

		}

	}

/** SET

Set a setting to a new value, create the setting if it does not exist yet

@param aKey the id of the setting

@param aVal the new value of the setting

*/

template <class T>

void SetSettingL(TUint32 aKey,const T& aVal)

	{

	TServerSetting* s = GetWritableSettingList().Find(aKey);

	if (s)

		{

		if (s->IsDeleted())

			{

	 		// replace the deleted entry with the new values

			s->CopyValueL(aVal);

			s->SetAccessPolicy(GetFallbackAccessPolicy(aKey)); 			

			}

		else

			{

			User::LeaveIfError(s->AssignValueFrom(aVal));	

			s->SetMeta(s->Meta() & (~KMetaDefaultValue));	

			}		

		}

	else	

		{

		TServerSetting* ns=GetSetting(aKey);

		TServerSetting newSetting(aKey);

		newSetting.CopyValueL(aVal);

		newSetting.SetAccessPolicy(GetFallbackAccessPolicy(aKey));

		TUint32 metadata;		

		if (!ns)

			{

			GetSingleMeta(aKey,metadata);

			}

		else

			{

			if (!ns->IsType(aVal))

				{

				User::Leave(KErrArgument);

				}			

			metadata = ~KMetaDefaultValue & ns->Meta();

			}

		newSetting.SetMeta(metadata);			

		newSetting.PushL(); // only needed for strings

		GetWritableSettingList().OrderedInsertL(newSetting);	

		newSetting.Pop();			

		}

	}

/** CREATE

Create a setting with a new value with a meta value.If meta value

not specified it will attempt to look for the meta in order of single

,range, and finally default meta

@param aKey the id of the setting

@param aVal the new value of the setting

@param aMeta the meta value of the setting

@leave KErrAlreadyExists if setting with that id already exist

*/

template <class T>

void CreateSettingL(TUint32 aKey, const T& aVal, TUint32* aMeta)

	{

	TServerSetting* s = GetSetting(aKey);

	if (s)

		{

		if (!s->IsDeleted())

			User::Leave(KErrAlreadyExists);

		else

			{

			//previously deleted settings			

			s->CopyValueL(aVal);

			s->SetAccessPolicy(GetFallbackAccessPolicy(aKey));		

			}

		}

	else

		{

		//brand new settings, create this

		TServerSetting newSetting(aKey);

		newSetting.CopyValueL(aVal);

		if (aMeta)		

			{

			newSetting.SetMeta(*aMeta);

			}

		else

			{

			TUint32 singleMeta;

			GetSingleMeta(aKey,singleMeta);

			newSetting.SetMeta(singleMeta);	

			}

		newSetting.SetAccessPolicy(GetFallbackAccessPolicy(aKey));

		newSetting.PushL(); // only needed for strings

		GetWritableSettingList().OrderedInsertL(newSetting);	

		newSetting.Pop();		

		}

	}

/** GETMETA

Retrieve the meta associated with a setting

@param aId the id of the setting

@param aMeta return value for the setting's meta

@return KErrNotFound if setting does not exist

*/

TInt GetMeta(TUint32 aId, TUint32& aMeta)

	{

	const TServerSetting* s = GetSetting(aId);

	//if is deleted or cannot be found

	if (s && s->IsDeleted() || !s)

		{

		return KErrNotFound;

		}

	aMeta = ~KMetaDefaultValue & s->Meta();

	return KErrNone;

	}

/** GET

Retrieve the value of a setting

@param aId the id of the setting

@param aVal return value for the setting's value

@return KErrNotFound if setting does not exist

		KErrArgument if specified setting type does not match	

*/

template <class T>

TInt Get(TUint32 aId, T& aVal)

	{

	const TServerSetting* s = GetSetting(aId);

	//if is deleted or cannot be found

	if (s && s->IsDeleted() || !s)

		{

		return KErrNotFound;

		}

	return s->AssignValueTo(aVal);

	}

/** FIND COMPARE

Retrieve a list of settings' id that match the value based on either the equal or not equal comparison

@param aInputArray the source array of pointer to the settings

@param aVal the value to be compared for the setting

@param aEqual the comparison rule to be applied

@param aFoundIds the passed in ID array to hold the matching settings

*/

template <class T>

void FindCompareL(const RSettingPointerArray& aInputArray,const T& aVal,TComparison aEqual,RArray<TUint32>& aFoundIds) const

	{

	aFoundIds.Reset();

	TInt numSettings=aInputArray.Count();

	for (TInt i=0;i< numSettings;i++)

		{

		ASSERT(aInputArray[i]);

		const TServerSetting& setting = *(aInputArray[i]);

		ASSERT(!setting.IsDeleted());

		TInt error=KErrNone;		

		if(aEqual && setting==aVal || !aEqual && setting!=aVal)

			{

			error = aFoundIds.Append(setting.Key());

			if (error != KErrNone)

				{

				aFoundIds.Reset();

				User::Leave(error);

				}

			}

		}

	if (aFoundIds.Count() == 0)

		{

		User::Leave(KErrNotFound);

		}

	}

/** FINDL

Retrieve a list of settings that match the partial id and mask

@param aSourcePartialKey the partial key to match

@param aMask the mask to be used with the partial key for matching

@param aFoundIds, the array to hold the found settings id

@param aFoundIdsMaxLimit, specify the max id to fit in the aFoundIds

@param aExcessIds, the array to hold the remaining settings id

*/		

void FindL(TUint32 aSourcePartialKey,TUint32 aMask,RArray<TUint32>& aFoundIds,TUint aFoundIdsMaxLimit,RArray<TUint32>& aExcessIds)

	{

	RSettingPointerArray settings;

	CleanupClosePushL(settings);

	TInt error = FindSettings(aSourcePartialKey,aMask, settings);

	if (error == KErrNone)

		{

		const TUint numSettings = settings.Count();

		if (numSettings==0)

			{

			User::Leave(KErrNotFound);

			}

		aFoundIds.Reset();

		const TUint numInitial = numSettings > aFoundIdsMaxLimit ? aFoundIdsMaxLimit : numSettings;

		const TUint numFinal = numSettings > aFoundIdsMaxLimit ? numSettings - aFoundIdsMaxLimit : 0;

		//reserve memory for everything that needs to be added to the array

		aFoundIds.ReserveL(numSettings);

		//now append up to aFoundIdsMaxLimit settings

		for(TUint i = 0; i < numInitial; i++)

			{

			ASSERT(settings[i]);

			// all settings flagged as deleted should have been removed by now, but just to be safe:

			ASSERT(!settings[i]->IsDeleted());

			aFoundIds.AppendL(settings[i]->Key());

			}

		//fill the aExcessIds array with any remaining settings

		if(numFinal)

			{

			aExcessIds.Reset();

			aExcessIds.ReserveL(numFinal);

			for(TUint i = numInitial; i < numSettings; i++)

				{

				ASSERT(settings[i]);

				// all settings flagged as deleted should have been removed by now, but just to be safe:

				ASSERT(!settings[i]->IsDeleted());

				aExcessIds.AppendL(settings[i]->Key());

				}

			}

		}

	CleanupStack::PopAndDestroy();

	User::LeaveIfError(error);

	}

/** MOVE

Move settings that match a given partial key to another target partial key given the mask

@param aSourcePartialKey, the source partialKey

@param aTargetPartialKey the target partialKey

@param aMask the mask to be used with the partial keys

@param aErrorKey to hold the error encountered during the move operation

@param aSourcePointerArray the array containing the source settings' pointer

*/

TInt MoveL(TUint32 aSourcePartialKey,TUint32 aTargetPartialKey,TUint32 aMask, TUint32& aErrorKey,

			const RSettingPointerArray& aSourcePointerArray)

	{

	// all write operations now done in a transaction

	TInt error = KErrNone;

	aErrorKey = KUnspecifiedKey;

	TUint32 maskedSourcePartialKey = aSourcePartialKey & aMask;

	TUint32 maskedTargetPartialKey = aTargetPartialKey & aMask;

	TUint32 sourceToTarget = maskedSourcePartialKey ^ maskedTargetPartialKey;

	if(!sourceToTarget)

		{

		// not moving anywhere: must return now as this trivial case fails with later logic

		return KErrNone;

		}

	//Validation of the SourcePointerArray whether any item exist

	if (aSourcePointerArray.Count() == 0)

		{

		aErrorKey=aSourcePartialKey;

		return KErrNotFound;

		}

	// create a local copy of settings as the settings pointed to by RSettingPointerArray 

	// could move and cause CServerRepository to point to the wrong key, added as fix for DEF080104

	RSettingsArray settingsCopy;

	CleanupClosePushL(settingsCopy);

	settingsCopy.CopyFromPointerArrayL(aSourcePointerArray);

	for (TInt i = 0; (i < settingsCopy.Count()) && (error == KErrNone); i++)

		{

		ASSERT(&settingsCopy[i]);

		TServerSetting& sourceSetting = settingsCopy[i];

		TUint32 sourceKey = sourceSetting.Key();

		TUint32 targetKey = sourceKey ^ sourceToTarget;

		TServerSetting* targetSetting = GetSetting(targetKey);		

		if (targetSetting)

			{

			// must be set as deleted only(for PC side this can never be reached, all setting either exist or not and if exist

			// this will return KErrAlreadyExists and this error already captured earlier

			ASSERT(targetSetting->IsDeleted());

			error = targetSetting->Replace(sourceSetting);

			if (error == KErrNone)

				{

				targetSetting->SetKey(targetKey);

				// setting takes the access policy of the target key

				targetSetting->SetAccessPolicy(GetFallbackAccessPolicy(targetKey));

				}

			}

		else

			{

			TServerSetting newSetting;

			error = newSetting.Replace(sourceSetting);

			if (error == KErrNone)

				{

				TUint32 metaFromIni;

				newSetting.SetKey(targetKey);

				GetSingleMeta(targetKey,metaFromIni);

				newSetting.SetMeta(metaFromIni);

				// setting takes the access policy of the target key

				newSetting.SetAccessPolicy(GetFallbackAccessPolicy(targetKey));

				newSetting.PushL(); // only needed for strings

				GetWritableSettingList().OrderedInsertL(newSetting);

				newSetting.Pop();	// only needed for strings

				}

			}

		// ensure there is a delete placeholder at the old location

		TServerSetting* oldSetting=GetWritableSettingList().Find(sourceKey);

		if (oldSetting)

			{

			oldSetting->Reset();

			oldSetting->SetDeleted();

			}

		else

			{

			//this part cannot happen for PC side as the search is on the persistent directly

			TServerSetting newSetting(sourceKey);

			newSetting.SetDeleted();

			GetWritableSettingList().OrderedInsertL(newSetting);			

			}

		}

	// destroy local copy of settings

	settingsCopy.Reset();

	CleanupStack::PopAndDestroy(&settingsCopy);

	return error;		

	}

	//pure virtual functions to be implemented by CServerRepository and CPcRepImpl

	/**

	Retrieve the meta for a setting, look for the meta in the order of individual setting meta

	range meta and then default meta.

	*/

	virtual void GetSingleMeta(TUint aKey,TUint32& aMeta)=0;

	/**

	Retrieve the fall back policy associated with a setting

	*/

	virtual TSettingsAccessPolicy* GetFallbackAccessPolicy(TUint32 aId) const =0;

	/**

	Retrieve a pointer to a setting having the key specified in aKey

	*/

	virtual TServerSetting* GetSetting(TUint aKey)=0;

	/**

	Retrieve the settings that match the partial key and mask and add it into the settings pointer array

	*/

	virtual TInt FindSettings(TUint32 aSourcePartialKey,TUint32 aMask,RSettingPointerArray& aOutputArray) const=0;

	/**

	Get the list of settings array where modification should be made

	*/

	virtual RSettingsArray& GetWritableSettingList() =0;

};

#endif // OPERATIONS_H