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CLiwDefaultList Class Reference

class CLiwDefaultList : public CLiwList

An ordered collection or sequence. CLiwDefaultList providers a default implementation for CLiwList. The collection entries are typically of type TLiwVarian.

This class provides concrete implementation to:

access elements based on index
remove an element
append an element to the end of the list collection
get the total number of elements stored in the list collection

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! IMPORTANT NOTE !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Since container objects are reference counted, they cannot go with CleanupStack::PushL. The issue is solved by using CleanupClosePushL for pushing the container objects into the CleanupStack. Hence CLiwContainer::Close method is introduced common to all container objects.

This implies that the object of this concrete implementation class being created should be pushed into the CleanupStack using CLiwContainer::PushL.

ServiceHandler.lib

CLiwContainer CLiwContainer::Close CLiwContainer::PushL CLiwList TLiwVariant

Inherits from

CLiwDefaultList
- CLiwList
  - CLiwContainer
    - CBase

Public Member Functions
IMPORT_C void	AppendL(const TLiwVariant &)
IMPORT_C TBool	AtL(TInt, TLiwVariant &)
IMPORT_C TInt	Count()
IMPORT_C void	ExternalizeL(RWriteStream &)
IMPORT_C CLiwDefaultList *	NewL()
IMPORT_C CLiwDefaultList *	NewLC()
CLiwDefaultList *	NewLC(RReadStream &)
IMPORT_C void	Remove(TInt)
IMPORT_C TInt	Size()

Private Member Functions
	CLiwDefaultList(CLiwGenericParamList *)
	~CLiwDefaultList()

Inherited Functions
	CBase::CBase()
	CBase::Delete(CBase *)
	CBase::Extension_(TUint,TAny &,TAny )
	CBase::operator new(TUint)
	CBase::operator new(TUint,TAny *)
	CBase::operator new(TUint,TLeave)
	CBase::operator new(TUint,TLeave,TUint)
	CBase::operator new(TUint,TUint)
	CBase::~CBase()
	CLiwContainer::CLiwContainer()
	CLiwContainer::Close()
	CLiwContainer::DecRef()
	CLiwContainer::IncRef()
	CLiwContainer::PushL()
	CLiwContainer::~CLiwContainer()
	CLiwList::operator==(const CLiwList &)const

Private Attributes
CLiwGenericParamList *	iList

Constructor & Destructor Documentation

CLiwDefaultList(CLiwGenericParamList *)

CLiwDefaultList

(

CLiwGenericParamList *

aList

)

[private, inline]

Parameters

CLiwGenericParamList * aList

~CLiwDefaultList()

IMPORT_C

~CLiwDefaultList

(

)

[private, virtual]

Member Functions Documentation

AppendL(const TLiwVariant &)

IMPORT_C void

AppendL

(

const TLiwVariant &

aEntry

)

[virtual]

Appends an entry to the end of the collection. The entry to be added is of type TLiwVariant.

A string content being added to the end of the collection

 _LIT8(KLitPbkService,"PhoneBookService");
 CLiwDefaultList* pList = CLiwDefaultList::NewL();
 pList->PushL();
 pList->AppendL(TLiwVariant(KLitPbkService));
 CleanupStack::Pop(pList);
 pList->DecRef();

An integer value being added to the end of the collection

 CLiwDefaultList* pList = CLiwDefaultList::NewL();
 pList->PushL();
 TInt intVal=0; 
 pList->AppendL(TLiwVariant(intVal));
 CleanupStack::Pop(pList);
 pList->DecRef();

Parameters

const TLiwVariant & aEntry

an Element to be added to the end of the collection

AtL(TInt, TLiwVariant &)

IMPORT_C TBool	AtL	(	TInt	aIndex,
			TLiwVariant &	aEntry
		)	const [virtual]

Gets an entry from the collection based on an integeral index.

!!!!!!!!!!!!!!!!!!!!!!!!!! IMPORTANT NOTE !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

This is a copy of the value present in the list at the particular index. To ensure proper cleanup TLiwVariant::PushL method should be called beforehand.

An integral value being retrieved from the collection

 CLiwDefaultList* pList = CLiwDefaultList::NewL();
 pList->PushL();
 TInt intVal=1100; //some magic number
 pList->AppendL(TLiwVariant(intVal));

 TInt nIndex=0; //only one entry is stored..
 TLiwVariant valFnd;
 valFnd.PushL(); //Pushes the TLiwVariant into the CleanupStack using TCleanupItem
 if(EFalse!=pList->AtL(nIndex,valFnd))
 {
 	TInt intValFnd=-1;
   valFnd.Get(intValFnd);
 }
 
 CleanupStack::PopAndDestroy(valFnd); //Pops and Destroys the TLiwVariant object
 CleanupStack::Pop(pList);
 pList->DecRef();

TLiwVariant::PushL

Parameters

TInt aIndex	to get an entry from the collection
TLiwVariant & aEntry	the returned element from the collection

Count()

IMPORT_C TInt

Count

(

)

const [virtual]

Returns the number of elements present in the collection.

ExternalizeL(RWriteStream &)

IMPORT_C void

ExternalizeL

(

RWriteStream &

aOutputStream

)

const [virtual]

Serializes the collection data entries to an output stream.

RWiteStream

Parameters

RWriteStream & aOutputStream

the output stream to which the data will be streamed

NewL()

IMPORT_C CLiwDefaultList *

NewL

(

)

[static]

Creates and returns a new instace of CLiwDefaultList

 void CreateListL()
 {
 	CLiwDefaultList* pList = CLiwDefaultList::NewL();
   pList->PushL();	//pushes the List into cleanupstack using CleanupClosePushL
 	
	CleanupStack::Pop(pList);
	pList->DecRef();
 }

@ see PushL @ see Close

NewLC()

IMPORT_C CLiwDefaultList *

NewLC

(

)

[static]

Creates and returns a new instace of CLiwDefaultList

 void CreateListL()
 {
 	CLiwDefaultList* pList = CLiwDefaultList::NewLC(); //pushes the List into cleanupstack using CleanupClosePushL
   
	CleanupStack::Pop(pList);
	pList->DecRef();
 }

@ see PushL @ see Close

NewLC(RReadStream &)

CLiwDefaultList *

NewLC

(

RReadStream &

aInputStream

)

[static]

Creates and returns a new instace of CLiwDefaultList. The collection elements will be generated from the data values read from the input stream. This method leaves the created instance in the cleanup stack.

Parameters

RReadStream & aInputStream

the input stream containing the data values to append to the list collection

Remove(TInt)

IMPORT_C void

Remove

(

TInt

aIndex

)

[virtual]

Removes an element located at the passed index from the collection.

An element being removed from the collection

 CLiwDefaultList* pList = CLiwDefaultList::NewL();
 pList->PushL();
 TInt intVal=1100; //some magic number
 pList->AppendL(TLiwVariant(intVal));

 TInt nIndex=0; //only one entry is stored..
 pList->Remove(nIndex);

 if(0==pList->Count())
 {
 	//should be zero
 }
  
 CleanupStack::Pop(pList);
 pList->DecRef();

Parameters

TInt aIndex

the index of the element to be removed from the collection

Size()

IMPORT_C TInt

Size

(

)

const [virtual]

Returns the size of the collection. The size is calculated based on the total numer of elements and the size of each element in the collection

Member Data Documentation

CLiwGenericParamList * iList

CLiwGenericParamList *

iList

[private]