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ContentAccess::CAgentResolver Class Reference

class ContentAccess::CAgentResolver : public CActive

Used to identify the Content Access Agent who handles a particular file.

CAgentResolver builds an array of CAgentInfo objects. Each CAgentInfo object holds metadata related to a particular agent implementation.

This class resolves:

Content to the Agent which manages it
Supplier mime-types to the agent which imports files with that mime type.

Inherits from

ContentAccess::CAgentResolver
- CActive
  - CBase

Public Member Functions
	~CAgentResolver()
CAgentInfo &	AgentInfo(TInt)
TInt	AgentInfoCount()
CAgentInfo &	AgentInfoL(const TUid &)
CAgentInfo &	AgentInfoL(const TDesC &)
IMPORT_C const RArray< TPtrC8 > &	ConsumerMimeTypes()
HBufC *	ConvertAgentFileNameL(const TDesC &)
TUid	DefaultAgentUid()
IMPORT_C TBool	DoRecognizeL(const TDesC &, const TDesC8 &, TDes8 &, TDes8 &)
IMPORT_C CAgentResolver *	NewL(const TBool)
IMPORT_C CAgentResolver *	NewLC(const TBool)
IMPORT_C TInt	PreferredBufferSize()
CAgentInfo &	ResolveConsumerMime(const TDesC8 &)
TUid	ResolveDirectory(const TDesC &, TDes &, TBool &)
CAgentInfo &	ResolveFileL(RFile &)
CAgentInfo &	ResolveFileL(const TDesC &, TDes &, TContentShareMode)
CAgentInfo &	ResolveSupplierMimeL(const TDesC8 &)
IMPORT_C const RArray< TPtrC8 > &	SupplierMimeTypes()

Private Member Functions
	CAgentResolver(const TBool)
void	AddAgentL(const CImplementationInformation &)
void	BuildListOfAgentsL()
void	CleanImplArray(TAny *)
void	ConstructL()
void	DestroyListOfAgents()
void	DoCancel()
TBool	IsF32Agent(CAgentInfo &)
void	RunL()

Inherited Functions
	CActive::CActive(TInt)
	CActive::Cancel()
	CActive::Deque()
	CActive::Extension_(TUint,TAny &,TAny )
	CActive::IsActive()const
	CActive::IsAdded()const
	CActive::Priority()const
	CActive::RunError(TInt)
	CActive::SetActive()
	CActive::SetPriority(TInt)
	CActive::~CActive()
	CBase::CBase()
	CBase::Delete(CBase *)
	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()

Inherited Enumerations
	CActive:TPriority

Private Attributes
RPointerArray< CAgentInfo >	iAgentInfos
RArray< TPtrC8 >	iConsumerMimeTypes
CAgentInfo *	iDefaultAgent
const TBool	iDynamicAgentUpdate
REComSession *	iEcomSession
RArray< TPtrC8 >	iSupplierMimeTypes

Inherited Attributes
	CActive::iStatus

Constructor & Destructor Documentation

CAgentResolver(const TBool)

CAgentResolver

(

const TBool

aDynamicAgentUpdate

)

[private]

Parameters

const TBool aDynamicAgentUpdate

~CAgentResolver()

~CAgentResolver

(

)

[virtual]

Member Functions Documentation

AddAgentL(const CImplementationInformation &)

void

AddAgentL

(

const CImplementationInformation &

aImplInfo

)

[private]

Add an agent to the list of agents

Parameters

const CImplementationInformation & aImplInfo

AgentInfo(TInt)

CAgentInfo &

AgentInfo

(

TInt

aIndex

)

const

Reference an agent in the iAgentInfos array by index

Parameters

TInt aIndex

AgentInfoCount()

TInt

AgentInfoCount

(

)

const

The number of agents, excluding the F32Agent

AgentInfoL(const TUid &)

CAgentInfo &

AgentInfoL

(

const TUid &

aUid

)

const

Find an agent by it's Uid

Parameters

const TUid & aUid

AgentInfoL(const TDesC &)

CAgentInfo &

AgentInfoL

(

const TDesC &

aAgentName

)

const

Find an agent by it's name

Parameters

const TDesC & aAgentName

BuildListOfAgentsL()

void

BuildListOfAgentsL

(

)

[private]

Builds a list of all the Content Access Agents.

CleanImplArray(TAny *)

void

CleanImplArray

(

TAny *

aArray

)

[private, static]

Parameters

TAny * aArray

ConstructL()

void

ConstructL

(

)

[private]

Second phase constructor for CAgentResolver

ConsumerMimeTypes()

IMPORT_C const RArray< TPtrC8 > &

ConsumerMimeTypes

(

)

const

Accessor for the ConsumerMimeTypes array.

Note:

Planning to remove this from the CAF API

ConvertAgentFileNameL(const TDesC &)

HBufC *

ConvertAgentFileNameL

(

const TDesC &

aFileName

)

const

Converts a filename containing the agent SID to the filename containing the agent name.

Parameters

const TDesC & aFileName

The filename in the form "c:\\private\\12345678\\"

DefaultAgentUid()

TUid

DefaultAgentUid

(

)

const

The default F32 agent

DestroyListOfAgents()

void

DestroyListOfAgents

(

)

[private]

Resets the list.

DoCancel()

void

DoCancel

(

)

[private, virtual]

Implements cancellation of an outstanding request.

This function is called as part of the active object's Cancel().

It must call the appropriate cancel function offered by the active object's asynchronous service provider. The asynchronous service provider's cancel is expected to act immediately.

DoCancel() must not wait for event completion; this is handled by Cancel().

CActive::Cancel

DoRecognizeL(const TDesC &, const TDesC8 &, TDes8 &, TDes8 &)

IMPORT_C TBool	DoRecognizeL	(	const TDesC &	aName,
			const TDesC8 &	aBuffer,
			TDes8 &	aFileMimeType,
			TDes8 &	aContentMimeType
		)

Determines the MIME types of the a file and the mime type of its contents.

This function should only be used by the CAF recogizer DLL.

Parameters

const TDesC & aName	The file name/URI to be investigated.
const TDesC8 & aBuffer	A buffer containing bytes from the start of the file.
TDes8 & aFileMimeType	If the file is recognized this will be populated with the mime type of the file.
TDes8 & aContentMimeType	If the file is recognized this will be populated with the mime type of the content object within the file.

IsF32Agent(CAgentInfo &)

TBool

IsF32Agent

(

CAgentInfo &

aAgentInfo

)

[private]

Is this the F32 Agent

Parameters

CAgentInfo & aAgentInfo

The agentinfo representing the agent

NewL(const TBool)

IMPORT_C CAgentResolver *

NewL

(

const TBool

aDynamicAgentUpdate

)

[static]

Constructs a new CAgentResolver

leave: KErrCANoAgent If no F32 agent was found

Parameters

const TBool aDynamicAgentUpdate

ETrue if the CAgentResolver should update its list of agents when new agents appear. A CActiveScheduler must already be running when ETrue is supplied

NewLC(const TBool)

IMPORT_C CAgentResolver *

NewLC

(

const TBool

aDynamicAgentUpdate

)

[static]

Constructs a new CAgentResolver and puts it on the cleanup stack

leave: KErrCANoAgent If no F32 agent was found

Parameters

const TBool aDynamicAgentUpdate

ETrue if the CAgentResolver should update its list of agents when new agents appear. A CActiveScheduler must already be running when ETrue is supplied

PreferredBufferSize()

IMPORT_C TInt

PreferredBufferSize

(

)

Gets the preferred buffer size for recognizing files using the RecognizeFile() function.

This function should only be used by the CAF recogizer DLL.

ResolveConsumerMime(const TDesC8 &)

CAgentInfo &

ResolveConsumerMime

(

const TDesC8 &

aMimeType

)

const

Finds the agent that handles the given consumer MIME type.

Note:

Planning to remove this from the CAF API

Parameters

const TDesC8 & aMimeType

MIME type of the file

ResolveDirectory(const TDesC &, TDes &, TBool &)

TUid	ResolveDirectory	(	const TDesC &	aPath,
			TDes &	aActualPath,
			TBool &	aThePrivateDir
		)	const

Find the agent who owns a directory

This function also maps a path from the agent directory name to it's actual name in the file system.

ie. For example if an agent "x" has files stored in a private server directory "c:\\private\\12345678\\"

The file appear as "c:\\private\\x\\" to applications using CAF. This function converts "c:\\private\\x\\" back to "c:\\private\\12345678\\"

Parameters

const TDesC & aPath	The path in the form c:\private\agent_name\...
TDes & aActualPath	The path in the form c:\private\SID\...
TBool & aThePrivateDir	to ETrue if the directory is just "\\private\\"

ResolveFileL(RFile &)

CAgentInfo &

ResolveFileL

(

RFile &

aFile

)

const

Finds the agent that handles a file.

Parameters

RFile & aFile

Handle of the file to be resolved.

ResolveFileL(const TDesC &, TDes &, TContentShareMode)

CAgentInfo &	ResolveFileL	(	const TDesC &	aUri,
			TDes &	aActualUri,
			TContentShareMode	aShareMode = EContentShareReadOnly
		)	const

Finds the agent that handles a file and returns the actual URI of the content.

If the aUri is of the form "c:\\private\\agent_name\\" it will be translated to the form "c:\\private\\SID\\" in aActualUri. Otherwise the aUri is just copied to aActualUri

Parameters

const TDesC & aUri	Location of file to be resolved.
TDes & aActualUri	The actual location of the file
TContentShareMode aShareMode = EContentShareReadOnly	The file sharing mode to be used with this file

ResolveSupplierMimeL(const TDesC8 &)

CAgentInfo &

ResolveSupplierMimeL

(

const TDesC8 &

aMimeType

)

const

Finds the agent that handles the given supplier MIME type.

leave: KErrCANoAgent If no CA agent supports the given MIME type.

Parameters

const TDesC8 & aMimeType

MIME type from the supplier application.

RunL()

void

RunL

(

)

[private, virtual]

Handles an active object's request completion event.

A derived class must provide an implementation to handle the completed request. If appropriate, it may issue another request.

The function is called by the active scheduler when a request completion event occurs, i.e. after the active scheduler's WaitForAnyRequest() function completes.

Before calling this active object's RunL() function, the active scheduler has:

1. decided that this is the highest priority active object with a completed request

2. marked this active object's request as complete (i.e. the request is no longer outstanding)

RunL() runs under a trap harness in the active scheduler. If it leaves, then the active scheduler calls RunError() to handle the leave.

Note that once the active scheduler's Start() function has been called, all user code is run under one of the program's active object's RunL() or RunError() functions.

CActiveScheduler::Start CActiveScheduler::Error CActiveScheduler::WaitForAnyRequest TRAPD