Root class for basic storage/retrieval algorithms. A Storage_Schema object processes: More...

#include <Storage_Schema.hxx>

Inheritance diagram for Storage_Schema:

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Public Member Functions
	Storage_Schema ()
	Builds a storage/retrieval algorithm based on a given data schema. Example For example, if ShapeSchema is the class inheriting from Storage_Schema and containing the description of your application data schema, you create a storage/retrieval algorithm as follows: Handle(ShapeSchema) s = new ShapeSchema; USER API – -----------------------------------------------------------— More...

void	SetVersion (const TCollection_AsciiString &aVersion)
	returns version of the schema More...

TCollection_AsciiString	Version () const
	returns the version of the schema More...

void	SetName (const TCollection_AsciiString &aSchemaName)
	set the schema's name More...

TCollection_AsciiString	Name () const
	returns the schema's name More...

void	Write (Storage_BaseDriver &s, const Handle< Storage_Data > &aData) const
	Writes the data aggregated in aData into the container defined by the driver s. The storage operation is performed according to the data schema with which this algorithm is working. Note: aData may aggregate several root objects to be stored together. More...

Handle< Storage_Data >	Read (Storage_BaseDriver &s) const
	Returns the data read from the container defined by the driver s. The retrieval operation is performed according to the data schema with which this algorithm is working. These data are aggregated in a Storage_Data object which may be browsed in order to extract the root objects from the container. More...

Handle< Storage_HeaderData >	ReadHeaderSection (Storage_BaseDriver &s) const
	read the header part of the stream Arguments: s: driver to read More...

Handle< Storage_TypeData >	ReadTypeSection (Storage_BaseDriver &s) const
	fill the TypeData with the names of the type used in a stream Arguments: s: driver to read More...

Handle< Storage_RootData >	ReadRootSection (Storage_BaseDriver &s) const
	read root part of the file Arguments: s: driver to read More...

virtual const TColStd_SequenceOfAsciiString &	SchemaKnownTypes () const
	returns the known types of a schema More...

Standard_Boolean	HasUnknownType (Storage_BaseDriver &aDriver, TColStd_SequenceOfAsciiString &theUnknownTypes) const
	indicates whether the are types in the driver which are not known from the schema and for which no callbacks have been set. The unknown types can be read in <theUnknownTypes>. More...

Handle< TColStd_HSequenceOfAsciiString >	GetAllSchemaKnownTypes () const
	returns the all known types of a schema and their nested schemes. More...

void	SetNestedSchemas (const Handle< Storage_HArrayOfSchema > &theSchemas)

void	ClearNestedSchemas ()

Handle< Storage_HArrayOfSchema >	NestedSchemas () const

void	AddReadUnknownTypeCallBack (const TCollection_AsciiString &aTypeName, const Handle< Storage_CallBack > &aCallBack)
	add two functions to the callback list More...

void	RemoveReadUnknownTypeCallBack (const TCollection_AsciiString &aTypeName)
	remove a callback for a type More...

Handle< TColStd_HSequenceOfAsciiString >	InstalledCallBackList () const
	returns a list of type name with installed callback. More...

void	ClearCallBackList ()
	clear all callback from schema instance. More...

void	UseDefaultCallBack ()
	install a callback for all unknown type. the objects with unknown types will be skipped. (look SkipObject method in BaseDriver) More...

void	DontUseDefaultCallBack ()
	tells schema to uninstall the default callback. More...

Standard_Boolean	IsUsingDefaultCallBack () const
	ask if the schema is using the default callback. More...

void	SetDefaultCallBack (const Handle< Storage_CallBack > &f)
	overload the default function for build.(use to set an error message or skip an object while reading an unknown type). More...

void	ResetDefaultCallBack ()
	reset the default function defined by Storage package. More...

Handle< Storage_CallBack >	DefaultCallBack () const
	returns the read function used when the UseDefaultCallBack() is set. More...

virtual Handle< Storage_CallBack >	CallBackSelection (const TCollection_AsciiString &tName) const

virtual Handle< Storage_CallBack >	AddTypeSelection (const Handle< Standard_Persistent > &sp) const

void	WritePersistentObjectHeader (const Handle< Standard_Persistent > &sp, Storage_BaseDriver &s)

void	ReadPersistentObjectHeader (Storage_BaseDriver &s)

void	WritePersistentReference (const Handle< Standard_Persistent > &sp, Storage_BaseDriver &s)

void	ReadPersistentReference (Handle< Standard_Persistent > &sp, Storage_BaseDriver &s)

Standard_Boolean	AddPersistent (const Handle< Standard_Persistent > &sp, const Standard_CString tName) const

Standard_Boolean	PersistentToAdd (const Handle< Standard_Persistent > &sp) const

Public Member Functions inherited from MMgt_TShared
virtual void	Delete () const
	Memory deallocator for transient classes. More...

Public Member Functions inherited from Standard_Transient
	Standard_Transient ()
	Empty constructor. More...

	Standard_Transient (const Standard_Transient &)
	Copy constructor – does nothing. More...

Standard_Transient &	operator= (const Standard_Transient &)
	Assignment operator, needed to avoid copying reference counter. More...

virtual	~Standard_Transient ()
	Destructor must be virtual. More...

virtual const Handle_Standard_Type &	DynamicType () const
	Returns a type information object about this object. More...

Standard_Boolean	IsInstance (const Handle_Standard_Type &theType) const
	Returns a true value if this is an instance of Type. More...

Standard_Boolean	IsInstance (const Standard_CString theTypeName) const
	Returns a true value if this is an instance of TypeName. More...

Standard_Boolean	IsKind (const Handle_Standard_Type &theType) const
	Returns true if this is an instance of Type or an instance of any class that inherits from Type. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...

Standard_Boolean	IsKind (const Standard_CString theTypeName) const
	Returns true if this is an instance of TypeName or an instance of any class that inherits from TypeName. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...

virtual Handle_Standard_Transient	This () const
	Returns a Handle which references this object. Must never be called to objects created in stack. More...

Standard_Integer	GetRefCount () const
	Get the reference counter of this object. More...

Static Public Member Functions
static TCollection_AsciiString	ICreationDate ()
	return a current date string More...

static Standard_Boolean	CheckTypeMigration (const TCollection_AsciiString &theTypeName, TCollection_AsciiString &theNewName)
	returns True if theType migration is identified the callback support provides a way to read a file with a incomplete schema. ex. : A file contains 3 types a,b and c. The application's schema contains only 2 type a and b. If you try to read the file in the application, you will have an error.To bypass this problem you can give to your application's schema a callback used when the schema dosent know how to handle this type. More...

Protected Member Functions
Standard_Boolean	IsNested () const

Handle< Storage_CallBack >	ResolveUnknownType (const TCollection_AsciiString &aTypeName, const Handle< Standard_Persistent > &aPers, const Storage_SolveMode aMode) const

Standard_Boolean	HasTypeBinding (const TCollection_AsciiString &aTypeName) const

void	BindType (const TCollection_AsciiString &aTypeName, const Handle< Storage_CallBack > &aCallBack) const

Handle< Storage_CallBack >	TypeBinding (const TCollection_AsciiString &aTypeName) const

Detailed Description

Root class for basic storage/retrieval algorithms. A Storage_Schema object processes:

writing of a set of persistent data into a container (store mechanism),
reading of a container to extract all the contained persistent data (retrieve mechanism). A Storage_Schema object is based on the data schema for the persistent data of the application, i.e.:
the list of all persistent objects which may be known by the application,
the organization of their data; a data schema knows how to browse each persistent object it contains. During the store or retrieve operation, only persistent objects known from the data schema can be processed; they are then stored or retrieved according to their description in the schema. A data schema is specific to the object classes to be read or written. Tools dedicated to the environment in use allow a description of the application persistent data structure. Storage_Schema algorithms are called basic because they do not support external references between containers.

Constructor & Destructor Documentation

Storage_Schema::Storage_Schema ( )

Builds a storage/retrieval algorithm based on a given data schema. Example For example, if ShapeSchema is the class inheriting from Storage_Schema and containing the description of your application data schema, you create a storage/retrieval algorithm as follows: Handle(ShapeSchema) s = new ShapeSchema;

USER API – -----------------------------------------------------------—

Member Function Documentation

Standard_Boolean Storage_Schema::AddPersistent	(	const Handle< Standard_Persistent > &	sp,
		const Standard_CString	tName
	)		const

void Storage_Schema::AddReadUnknownTypeCallBack	(	const TCollection_AsciiString &	aTypeName,
		const Handle< Storage_CallBack > &	aCallBack
	)

add two functions to the callback list

virtual Handle< Storage_CallBack > Storage_Schema::AddTypeSelection ( const Handle< Standard_Persistent > & sp ) const

virtual

void Storage_Schema::BindType	(	const TCollection_AsciiString &	aTypeName,
		const Handle< Storage_CallBack > &	aCallBack
	)		const

protected

virtual Handle< Storage_CallBack > Storage_Schema::CallBackSelection ( const TCollection_AsciiString & tName ) const

virtual

static Standard_Boolean Storage_Schema::CheckTypeMigration	(	const TCollection_AsciiString &	theTypeName,
		TCollection_AsciiString &	theNewName
	)

static

returns True if theType migration is identified the callback support provides a way to read a file with a incomplete schema. ex. : A file contains 3 types a,b and c. The application's schema contains only 2 type a and b. If you try to read the file in the application, you will have an error.To bypass this problem you can give to your application's schema a callback used when the schema dosent know how to handle this type.

void Storage_Schema::ClearCallBackList ( )

clear all callback from schema instance.

void Storage_Schema::ClearNestedSchemas ( )

Handle< Storage_CallBack > Storage_Schema::DefaultCallBack ( ) const

returns the read function used when the UseDefaultCallBack() is set.

void Storage_Schema::DontUseDefaultCallBack ( )

tells schema to uninstall the default callback.

Handle< TColStd_HSequenceOfAsciiString > Storage_Schema::GetAllSchemaKnownTypes ( ) const

returns the all known types of a schema and their nested schemes.

Standard_Boolean Storage_Schema::HasTypeBinding ( const TCollection_AsciiString & aTypeName ) const

protected

Standard_Boolean Storage_Schema::HasUnknownType	(	Storage_BaseDriver &	aDriver,
		TColStd_SequenceOfAsciiString &	theUnknownTypes
	)		const

indicates whether the are types in the driver which are not known from the schema and for which no callbacks have been set. The unknown types can be read in <theUnknownTypes>.

static TCollection_AsciiString Storage_Schema::ICreationDate ( )

static

return a current date string

Handle< TColStd_HSequenceOfAsciiString > Storage_Schema::InstalledCallBackList ( ) const

returns a list of type name with installed callback.

Standard_Boolean Storage_Schema::IsNested ( ) const

protected

Standard_Boolean Storage_Schema::IsUsingDefaultCallBack ( ) const

ask if the schema is using the default callback.

TCollection_AsciiString Storage_Schema::Name ( ) const

returns the schema's name

Handle< Storage_HArrayOfSchema > Storage_Schema::NestedSchemas ( ) const

Standard_Boolean Storage_Schema::PersistentToAdd ( const Handle< Standard_Persistent > & sp ) const

Handle< Storage_Data > Storage_Schema::Read ( Storage_BaseDriver & s ) const

Returns the data read from the container defined by the driver s. The retrieval operation is performed according to the data schema with which this algorithm is working. These data are aggregated in a Storage_Data object which may be browsed in order to extract the root objects from the container.

Handle< Storage_HeaderData > Storage_Schema::ReadHeaderSection ( Storage_BaseDriver & s ) const

read the header part of the stream Arguments: s: driver to read

void Storage_Schema::ReadPersistentObjectHeader ( Storage_BaseDriver & s )

void Storage_Schema::ReadPersistentReference	(	Handle< Standard_Persistent > &	sp,
		Storage_BaseDriver &	s
	)

Handle< Storage_RootData > Storage_Schema::ReadRootSection ( Storage_BaseDriver & s ) const

read root part of the file Arguments: s: driver to read

Handle< Storage_TypeData > Storage_Schema::ReadTypeSection ( Storage_BaseDriver & s ) const

fill the TypeData with the names of the type used in a stream Arguments: s: driver to read

void Storage_Schema::RemoveReadUnknownTypeCallBack ( const TCollection_AsciiString & aTypeName )

remove a callback for a type

void Storage_Schema::ResetDefaultCallBack ( )

reset the default function defined by Storage package.

Handle< Storage_CallBack > Storage_Schema::ResolveUnknownType	(	const TCollection_AsciiString &	aTypeName,
		const Handle< Standard_Persistent > &	aPers,
		const Storage_SolveMode	aMode
	)		const

protected

virtual const TColStd_SequenceOfAsciiString& Storage_Schema::SchemaKnownTypes ( ) const

virtual

returns the known types of a schema

void Storage_Schema::SetDefaultCallBack ( const Handle< Storage_CallBack > & f )

overload the default function for build.(use to set an error message or skip an object while reading an unknown type).

void Storage_Schema::SetName ( const TCollection_AsciiString & aSchemaName )

set the schema's name

void Storage_Schema::SetNestedSchemas ( const Handle< Storage_HArrayOfSchema > & theSchemas )

void Storage_Schema::SetVersion ( const TCollection_AsciiString & aVersion )

returns version of the schema

Handle< Storage_CallBack > Storage_Schema::TypeBinding ( const TCollection_AsciiString & aTypeName ) const

protected

void Storage_Schema::UseDefaultCallBack ( )

install a callback for all unknown type. the objects with unknown types will be skipped. (look SkipObject method in BaseDriver)

TCollection_AsciiString Storage_Schema::Version ( ) const

returns the version of the schema

void Storage_Schema::Write	(	Storage_BaseDriver &	s,
		const Handle< Storage_Data > &	aData
	)		const

Writes the data aggregated in aData into the container defined by the driver s. The storage operation is performed according to the data schema with which this algorithm is working. Note: aData may aggregate several root objects to be stored together.

void Storage_Schema::WritePersistentObjectHeader	(	const Handle< Standard_Persistent > &	sp,
		Storage_BaseDriver &	s
	)

void Storage_Schema::WritePersistentReference	(	const Handle< Standard_Persistent > &	sp,
		Storage_BaseDriver &	s
	)

The documentation for this class was generated from the following file:

Storage_Schema.hxx

Public Member Functions

Static Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation