CStoreMap Class Reference

class CStoreMap : public CBase

Store map used when externalising swizzled in-memory objects.

It has three main characteristics:

it acts as an in-memory repository of stream ids and associated swizzles

it acts as an externaliser for swizzles

it offers cleanup support

Inherits from

Nested Classes and Structures

Constructor & Destructor Documentation

CStoreMap(CStreamStore &)

IMPORT_CCStoreMap(CStreamStore &aStore)

Parameters

CStreamStore & aStore

~CStoreMap()

IMPORT_C~CStoreMap()

Frees resources owned by the object, prior to its destruction.

In particular, the destructor deletes all streams whose stream ids are currently held within the store map and then empties the store map.

Member Functions Documentation

At(TSwizzleC< TAny >)

IMPORT_C TStreamIdAt(TSwizzleC< TAny >aSwizzle)const

Returns the stream id of the first entry the store map matching the specified swizzle.

Callers of this function can pass any type of swizzle as the first parameter, i.e. any swizzle derived from TSwizzleCBase. The required TSwizzleC<TAny> object is constructed from the swizzle passed by the caller.

Parameters

TSwizzleC< TAny > aSwizzleAny type of swizzle derived from TSwizzleCBase.

Begin()

IMPORT_C TIteratorBegin()const

BindL(TSwizzleC< TAny >, TStreamId)

IMPORT_C voidBindL(TSwizzleC< TAny >aSwizzle,
TStreamIdanId
)

Creates an entry in the store map to contain the specified stream id and an associated swizzle. On return from this function, the stream id is said to be bound to the swizzle.

If the store map already contains an entry with the same swizzle, then the new entry replaces the existing entry; in effect, knowledge of the original stream id associated with aSwizzle, is lost.

Callers of this function can pass any type of swizzle as the first parameter, i.e. any swizzle derived from TSwizzleCBase. The required TSwizzleC<TAny> object is constructed from the swizzle passed by the caller.

Note that in most applications, callers pass a general swizzle, i.e. an object of type TSwizzle<class T>, where T is the type of object represented by that swizzle.

Parameters

TSwizzleC< TAny > aSwizzleAny swizzle derived from TSwizzleCBase.
TStreamId anIdThe stream id to be bound to the swizzle.

End()

IMPORT_C TIteratorEnd()const

ExternalizeL(const TStreamRef &, RWriteStream &)

voidExternalizeL(const TStreamRef &aRef,
RWriteStream &aStream
)const [private]

Parameters

const TStreamRef & aRef
RWriteStream & aStream

Forget(TStreamId)

IMPORT_C voidForget(TStreamIdanId)

Deletes an entry from the store map. The entry selected is the first one whose stream id matches the specified stream id.

On return from this function, the stream id is said to be forgotten and knowledge of that stream id is lost.

Parameters

TStreamId anIdThe stream id used to identify the entry in the store map to be deleted.

Label(TStreamId)

IMPORT_C TSwizzleC< TAny >Label(TStreamIdanId)const

Returns the swizzle in the store map assocated with the specified stream id.

Parameters

TStreamId anIdThe id of the stream

NewL(CStreamStore &)

IMPORT_C CStoreMap *NewL(CStreamStore &aStore)[static]

Allocates and constructs a store map associated with the specified store and returns a pointer to that store map.

The function leaves if it cannot complete successfully.

Parameters

CStreamStore & aStoreA reference to the store associated with this store map.

NewLC(CStreamStore &)

IMPORT_C CStoreMap *NewLC(CStreamStore &aStore)[static]

Allocates and constructs a store map associated with the specified store, returns a pointer to that store map and puts the pointer onto the cleanup stack.

The function leaves if it cannot complete successfully.

Placing a pointer to this object onto the cleanup stack allows the object and allocated resources to be cleaned up if a subsequent leave occurs.

Parameters

CStreamStore & aStoreA reference to the store associated with this store map.

Reset()

IMPORT_C voidReset()

Deletes all entries from the store map.

It is important that this function is called before deleting the store map, as the destructor attempts to delete all streams whose stream ids are held within the map.

ResetAndDestroy()

IMPORT_C voidResetAndDestroy()

Deletes all streams whose ids are held within the store map, and then empties the store map.

Unbind(TSwizzleC< TAny >)

IMPORT_C voidUnbind(TSwizzleC< TAny >aSwizzle)

Deletes the first entry from the store map corresponding to the specified swizzle.

On return from this function, the swizzle is said to be unbound and knowledge of the associated stream id is lost.

Callers of this function can pass any type of swizzle as the parameter, i.e. any swizzle derived from TSwizzleCBase. The required TSwizzleC<TAny> object is constructed from the swizzle passed by the caller.

Notes:

In most applications, callers pass a general swizzle, i.e. an object of type TSwizzle<class T>, where T is the type of object represented by that swizzle.

If no matching entry can be found in the store map, then the store map remains unaltered.

Parameters

TSwizzleC< TAny > aSwizzleAny swizzle derived from TSwizzleCBase.

Member Type Definitions Documentation

Typedef TIterator

typedef const TEntry *TIterator

Member Data Documentation

CArrayFixFlat< TEntry > iArray

CArrayFixFlat< TEntry >iArray[private]

TStreamId iFree

TStreamId iFree[private]

CStreamStore * iStore

CStreamStore *iStore[private]