Base class for file format implementations. More...

Inheritance diagram for SdfFileFormat:

Public Types
typedef std::map< std::string, std::string >	FileFormatArguments
	Type for specifying additional file format-specific arguments to the various API below. More...

Public Types inherited from TfRefBase
typedef void(*	UniqueChangedFuncPtr )(TfRefBase const *, bool)

Public Member Functions
	SdfFileFormat (const SdfFileFormat &)=delete

SdfFileFormat &	operator= (const SdfFileFormat &)=delete

SDF_API const SdfSchemaBase &	GetSchema () const
	Returns the schema for this format. More...

SDF_API const TfToken &	GetFormatId () const
	Returns the format identifier. More...

SDF_API const TfToken &	GetTarget () const
	Returns the target for this file format. More...

SDF_API const std::string &	GetFileCookie () const
	Returns the cookie to be used when writing files with this format. More...

SDF_API const TfToken &	GetVersionString () const
	Returns the current version of this file format. More...

SDF_API bool	IsPrimaryFormatForExtensions () const
	Returns true if this file format is the primary format for the extensions it handles. More...

SDF_API const std::vector < std::string > &	GetFileExtensions () const
	Returns a list of extensions that this format supports. More...

SDF_API const std::string &	GetPrimaryFileExtension () const
	Returns the primary file extension for this format. More...

SDF_API bool	IsSupportedExtension (const std::string &extension) const
	Returns true if `extension` matches one of the extensions returned by GetFileExtensions. More...

virtual SDF_API bool	IsPackage () const
	Returns true if this file format is a package containing other assets. More...

virtual SDF_API std::string	GetPackageRootLayerPath (const std::string &resolvedPath) const
	Returns the path of the "root" layer contained in the package layer at `resolvedPath` produced by this file format. More...

virtual SDF_API FileFormatArguments	GetDefaultFileFormatArguments () const
	Returns the FileFormatArguments that correspond to the default behavior of this file format when no FileFormatArguments are passed to NewLayer or InitData. More...

virtual SDF_API SdfAbstractDataRefPtr	InitData (const FileFormatArguments &args) const
	This method allows the file format to bind to whatever data container is appropriate. More...

SDF_API SdfLayerRefPtr	NewLayer (const SdfFileFormatConstPtr &fileFormat, const std::string &identifier, const std::string &realPath, const ArAssetInfo &assetInfo, const FileFormatArguments &args) const
	Instantiate a layer. More...

SDF_API bool	ShouldSkipAnonymousReload () const
	Return true if this file format prefers to skip reloading anonymous layers. More...

SDF_API bool	ShouldReadAnonymousLayers () const
	Returns true if anonymous layer identifiers should be passed to Read when a layer is opened or reloaded. More...

virtual SDF_API bool	CanRead (const std::string &file) const =0
	Returns true if `file` can be read by this format. More...

virtual SDF_API bool	Read (SdfLayer *layer, const std::string &resolvedPath, bool metadataOnly) const =0
	Reads scene description from the asset specified by `resolvedPath` into the layer `layer`. More...

virtual SDF_API bool	WriteToFile (const SdfLayer &layer, const std::string &filePath, const std::string &comment=std::string(), const FileFormatArguments &args=FileFormatArguments()) const
	Writes the content in `layer` into the file at `filePath`. More...

virtual SDF_API bool	ReadFromString (SdfLayer *layer, const std::string &str) const
	Reads data in the string `str` into the layer `layer`. More...

virtual SDF_API bool	WriteToStream (const SdfSpecHandle &spec, std::ostream &out, size_t indent) const
	Write the provided `spec` to `out` indented `indent` levels. More...

virtual SDF_API bool	WriteToString (const SdfLayer &layer, std::string *str, const std::string &comment=std::string()) const
	Writes the content in `layer` to the string `str`. More...

virtual SDF_API std::set < std::string >	GetExternalAssetDependencies (const SdfLayer &layer) const
	Returns the set of resolved paths to external asset file dependencies for the given `layer`. More...

Public Member Functions inherited from TfRefBase
size_t	GetCurrentCount () const
	Return the current reference count of this object. More...

bool	IsUnique () const
	Return true if only one `TfRefPtr` points to this object. More...

const TfRefCount &	GetRefCount () const

void	SetShouldInvokeUniqueChangedListener (bool shouldCall)

Public Member Functions inherited from TfWeakBase
	TfWeakBase (const TfWeakBase &)

const TfWeakBase &	__GetTfWeakBase__ () const

const TfWeakBase &	operator= (const TfWeakBase &)

void	EnableNotification2 () const

TF_API void const *	GetUniqueIdentifier () const

Static Public Member Functions
static SDF_API std::string	GetFileExtension (const std::string &s)
	Returns the file extension for path or file name `s`, without the leading dot character. More...

static SDF_API std::set < std::string >	FindAllFileFormatExtensions ()
	Returns a set containing the extension(s) corresponding to all registered file formats. More...

static SDF_API SdfFileFormatConstPtr	FindById (const TfToken &formatId)
	Returns the file format instance with the specified `formatId` identifier. More...

static SDF_API SdfFileFormatConstPtr	FindByExtension (const std::string &path, const std::string &target=std::string())
	Returns the file format instance that supports the extension for `path`. More...

static SDF_API SdfFileFormatConstPtr	FindByExtension (const std::string &path, const FileFormatArguments &args)
	Returns a file format instance that supports the extension for `path` and whose target matches one of those specified by the given `args`. More...

Static Public Member Functions inherited from TfRefBase
static TF_API void	SetUniqueChangedListener (UniqueChangedListener listener)

Protected Member Functions
SDF_API	SdfFileFormat (const TfToken &formatId, const TfToken &versionString, const TfToken &target, const std::string &extension)
	Constructor. More...

SDF_API	SdfFileFormat (const TfToken &formatId, const TfToken &versionString, const TfToken &target, const std::string &extension, const SdfSchemaBase &schema)
	Constructor. More...

	SdfFileFormat (const TfToken &formatId, const TfToken &versionString, const TfToken &target, const std::string &extension, const SdfSchemaBase &&schema)=delete
	Disallow temporary SdfSchemaBase objects being passed to the c'tor. More...

SDF_API	SdfFileFormat (const TfToken &formatId, const TfToken &versionString, const TfToken &target, const std::vector< std::string > &extensions)
	Constructor. More...

SDF_API	SdfFileFormat (const TfToken &formatId, const TfToken &versionString, const TfToken &target, const std::vector< std::string > &extensions, const SdfSchemaBase &schema)
	Constructor. More...

	SdfFileFormat (const TfToken &formatId, const TfToken &versionString, const TfToken &target, const std::vector< std::string > &extensions, const SdfSchemaBase &&schema)=delete
	Disallow temporary SdfSchemaBase objects being passed to the c'tor. More...

virtual SDF_API	~SdfFileFormat ()
	Destructor. More...

virtual SDF_API SdfLayer *	_InstantiateNewLayer (const SdfFileFormatConstPtr &fileFormat, const std::string &identifier, const std::string &realPath, const ArAssetInfo &assetInfo, const FileFormatArguments &args) const

virtual SDF_API bool	_ShouldSkipAnonymousReload () const

virtual SDF_API bool	_ShouldReadAnonymousLayers () const
	File format subclasses may override this to specify whether Read should be called when creating, opening, or reloading an anonymous layer of this format. More...

Protected Member Functions inherited from TfWeakBase
TfRefPtr< Tf_Remnant >	_Register () const

template<class T >
TfRefPtr< Tf_Remnant >	_Register (T *tempRmnt) const

bool	_HasRemnant () const

Static Protected Member Functions
static SDF_API void	_SetLayerData (SdfLayer *layer, SdfAbstractDataRefPtr &data)
	Set the internal data for `layer` to `data`, possibly transferring ownership of `data`. More...

static SDF_API void	_SetLayerData (SdfLayer *layer, SdfAbstractDataRefPtr &data, SdfLayerHints hints)
	Set the internal data for `layer` to `data`, possibly transferring ownership of `data`. More...

static SDF_API SdfAbstractDataConstPtr	_GetLayerData (const SdfLayer &layer)
	Get the internal data for `layer`. More...

Detailed Description

Base class for file format implementations.

Definition at line 64 of file fileFormat.h.

Member Typedef Documentation

typedef std::map<std::string, std::string> FileFormatArguments

Type for specifying additional file format-specific arguments to the various API below.

Definition at line 119 of file fileFormat.h.

Constructor & Destructor Documentation

SDF_API SdfFileFormat	(	const TfToken &	formatId,
		const TfToken &	versionString,
		const TfToken &	target,
		const std::string &	extension
	)

protected

Constructor.

SDF_API SdfFileFormat	(	const TfToken &	formatId,
		const TfToken &	versionString,
		const TfToken &	target,
		const std::string &	extension,
		const SdfSchemaBase &	schema
	)

protected

Constructor.

schema must remain valid for the lifetime of this file format.

SdfFileFormat	(	const TfToken &	formatId,
		const TfToken &	versionString,
		const TfToken &	target,
		const std::string &	extension,
		const SdfSchemaBase &&	schema
	)

protecteddelete

Disallow temporary SdfSchemaBase objects being passed to the c'tor.

SDF_API SdfFileFormat	(	const TfToken &	formatId,
		const TfToken &	versionString,
		const TfToken &	target,
		const std::vector< std::string > &	extensions
	)

protected

Constructor.

SDF_API SdfFileFormat	(	const TfToken &	formatId,
		const TfToken &	versionString,
		const TfToken &	target,
		const std::vector< std::string > &	extensions,
		const SdfSchemaBase &	schema
	)

protected

Constructor.

schema must remain valid for the lifetime of this file format.

SdfFileFormat	(	const TfToken &	formatId,
		const TfToken &	versionString,
		const TfToken &	target,
		const std::vector< std::string > &	extensions,
		const SdfSchemaBase &&	schema
	)

protecteddelete

Disallow temporary SdfSchemaBase objects being passed to the c'tor.

virtual SDF_API ~SdfFileFormat ( )

protectedvirtual

Destructor.

Member Function Documentation

static SDF_API SdfAbstractDataConstPtr _GetLayerData ( const SdfLayer & layer )

staticprotected

Get the internal data for layer.

static SDF_API void _SetLayerData	(	SdfLayer *	layer,
		SdfAbstractDataRefPtr &	data
	)

staticprotected

Set the internal data for layer to data, possibly transferring ownership of data.

Existing layer hints are reset to the default hints.

static SDF_API void _SetLayerData	(	SdfLayer *	layer,
		SdfAbstractDataRefPtr &	data,
		SdfLayerHints	hints
	)

staticprotected

Set the internal data for layer to data, possibly transferring ownership of data.

Existing layer hints are replaced with hints.

virtual SDF_API bool _ShouldReadAnonymousLayers ( ) const

protectedvirtual

File format subclasses may override this to specify whether Read should be called when creating, opening, or reloading an anonymous layer of this format.

Default implementation returns false.

virtual SDF_API bool CanRead ( const std::string & file ) const

pure virtual

Returns true if file can be read by this format.

Implemented in UsdUsdFileFormat, UsdUsdzFileFormat, SdfTextFileFormat, and UsdUsdcFileFormat.

static SDF_API std::set<std::string> FindAllFileFormatExtensions ( )

static

Returns a set containing the extension(s) corresponding to all registered file formats.

static SDF_API SdfFileFormatConstPtr FindByExtension	(	const std::string &	path,
		const std::string &	target = `std::string()`
	)

static

Returns the file format instance that supports the extension for path.

If a format with a matching extension is not found, this returns a null file format pointer.

An extension may be handled by multiple file formats, but each with a different target. In such cases, if no target is specified, the file format that is registered as the primary plugin will be returned. Otherwise, the file format whose target matches target will be returned.

static SDF_API SdfFileFormatConstPtr FindByExtension	(	const std::string &	path,
		const FileFormatArguments &	args
	)

static

Returns a file format instance that supports the extension for path and whose target matches one of those specified by the given args.

If the args specify no target, then the file format that is registered as the primary plugin will be returned. If a format with a matching extension is not found, this returns a null file format pointer.

static SDF_API SdfFileFormatConstPtr FindById ( const TfToken & formatId )

static

Returns the file format instance with the specified formatId identifier.

If a format with a matching identifier is not found, this returns a null file format pointer.

virtual SDF_API FileFormatArguments GetDefaultFileFormatArguments ( ) const

virtual

Returns the FileFormatArguments that correspond to the default behavior of this file format when no FileFormatArguments are passed to NewLayer or InitData.

virtual SDF_API std::set<std::string> GetExternalAssetDependencies ( const SdfLayer & layer ) const

virtual

Returns the set of resolved paths to external asset file dependencies for the given layer.

These are additional dependencies, specific to the file format, that are needed when generating the layer's contents and would not otherwise be discoverable through composition dependencies (i.e. sublayers, references, and payloads).

The default implementation returns an empty set. Derived file formats that depend on external assets to read and generate layer content should implement this function to return the external asset paths.

See Also: SdfLayer::GetExternalAssetDependencies; SdfLayer::Reload

SDF_API const std::string& GetFileCookie ( ) const

Returns the cookie to be used when writing files with this format.

static SDF_API std::string GetFileExtension ( const std::string & s )

static

Returns the file extension for path or file name s, without the leading dot character.

SDF_API const std::vector<std::string>& GetFileExtensions ( ) const

Returns a list of extensions that this format supports.

SDF_API const TfToken& GetFormatId ( ) const

Returns the format identifier.

virtual SDF_API std::string GetPackageRootLayerPath ( const std::string & resolvedPath ) const

virtual

Returns the path of the "root" layer contained in the package layer at resolvedPath produced by this file format.

If this file format is not a package, returns the empty string.

The package root layer is the layer in the package layer that is used when that package is opened via SdfLayer.

Reimplemented in UsdUsdzFileFormat.

SDF_API const std::string& GetPrimaryFileExtension ( ) const

Returns the primary file extension for this format.

This is the extension that is reported for layers using this file format.

SDF_API const SdfSchemaBase& GetSchema ( ) const

Returns the schema for this format.

SDF_API const TfToken& GetTarget ( ) const

Returns the target for this file format.

SDF_API const TfToken& GetVersionString ( ) const

Returns the current version of this file format.

virtual SDF_API SdfAbstractDataRefPtr InitData ( const FileFormatArguments & args ) const

virtual

This method allows the file format to bind to whatever data container is appropriate.

Returns a shared pointer to an SdfAbstractData implementation.

Reimplemented in UsdUsdFileFormat, UsdUsdzFileFormat, and UsdUsdcFileFormat.

virtual SDF_API bool IsPackage ( ) const

virtual

Returns true if this file format is a package containing other assets.

Reimplemented in UsdUsdzFileFormat.

SDF_API bool IsPrimaryFormatForExtensions ( ) const

Returns true if this file format is the primary format for the extensions it handles.

SDF_API bool IsSupportedExtension ( const std::string & extension ) const

Returns true if extension matches one of the extensions returned by GetFileExtensions.

SDF_API SdfLayerRefPtr NewLayer	(	const SdfFileFormatConstPtr &	fileFormat,
		const std::string &	identifier,
		const std::string &	realPath,
		const ArAssetInfo &	assetInfo,
		const FileFormatArguments &	args
	)		const

Instantiate a layer.

virtual SDF_API bool Read	(	SdfLayer *	layer,
		const std::string &	resolvedPath,
		bool	metadataOnly
	)		const

pure virtual

Reads scene description from the asset specified by resolvedPath into the layer layer.

metadataOnly is a flag that asks for only the layer metadata to be read in, which can be much faster if that is all that is required. Note that this is just a hint: some FileFormat readers may disregard this flag and still fully populate the layer contents.

Returns true if the asset is successfully read into layer, false otherwise.

Implemented in UsdUsdFileFormat, UsdUsdzFileFormat, SdfTextFileFormat, and UsdUsdcFileFormat.

virtual SDF_API bool ReadFromString	(	SdfLayer *	layer,
		const std::string &	str
	)		const

virtual

Reads data in the string str into the layer layer.

If the file is successfully read, this method returns true. Otherwise, false is returned and errors are posted.

Reimplemented in UsdUsdFileFormat, UsdUsdzFileFormat, SdfTextFileFormat, and UsdUsdcFileFormat.

SDF_API bool ShouldReadAnonymousLayers ( ) const

Returns true if anonymous layer identifiers should be passed to Read when a layer is opened or reloaded.

Anonymous layers will not have an asset backing and thus for most file formats there is nothing that can be read for an anonymous layer. However, there are file formats that use Read to generate dynamic layer content without reading any data from the resolved asset associated with the layer's identifier.

For these types of file formats it is useful to be able to open anonymous layers and allow Read to populate them to avoid requiring a placeholder asset to exist just so Read can populate the layer.

SDF_API bool ShouldSkipAnonymousReload ( ) const

Return true if this file format prefers to skip reloading anonymous layers.

virtual SDF_API bool WriteToFile	(	const SdfLayer &	layer,
		const std::string &	filePath,
		const std::string &	comment = `std::string()`,
		const FileFormatArguments &	args = `FileFormatArguments()`
	)		const

virtual

Writes the content in layer into the file at filePath.

If the content is successfully written, this method returns true. Otherwise, false is returned and errors are posted. The default implementation returns false.

Reimplemented in UsdUsdFileFormat, UsdUsdzFileFormat, SdfTextFileFormat, and UsdUsdcFileFormat.