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 // Created on: 1999-04-07
 // Created by: Denis PASCAL
 // Copyright (c) 1999 Matra Datavision
 // Copyright (c) 1999-2014 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef _TDocStd_Document_HeaderFile
 #define _TDocStd_Document_HeaderFile
 
 #include <Standard.hxx>
 
 #include <Standard_Integer.hxx>
 #include <TDF_Transaction.hxx>
 #include <TDF_DeltaList.hxx>
 #include <CDM_Document.hxx>
 #include <TDF_LabelMap.hxx>
 #include <TDocStd_FormatVersion.hxx>
 class TDF_Data;
 class TDF_Delta;
 class TDF_Label;
 class TCollection_AsciiString;
 class TDocStd_CompoundDelta;
 
 
 class TDocStd_Document;
 DEFINE_STANDARD_HANDLE(TDocStd_Document, CDM_Document)
 
 //! The contents of a TDocStd_Application, a
 //! document is a container for a data framework
 //! composed of labels and attributes. As such,
 //! TDocStd_Document is the entry point into the data framework.
 //! To gain access to the data, you create a document as follows:
 //! Handle(TDocStd_Document) MyDF = new TDocStd_Document
 //! The document also allows you to manage:
 //! -   modifications, providing Undo and Redo functions.
 //! -   command transactions.
 //! Warning: The only data saved is the framework (TDF_Data)
 class TDocStd_Document : public CDM_Document
 {
 
 public:
 
   
   //! Will Abort any execution, clear fields
   //! returns the    document which contains <L>.  raises  an
   //! exception if the document is not found.
   Standard_EXPORT static Handle(TDocStd_Document) Get (const TDF_Label& L);
   
   //! Constructs a document object defined by the
   //! string astorageformat.
   //! If a document is created outside of an application using this constructor, it must be
   //! managed by a Handle. Otherwise memory problems could appear: call of TDocStd_Owner::GetDocument
   //! creates a Handle(TDocStd_Document), so, releasing it will produce a crash.
   Standard_EXPORT TDocStd_Document(const TCollection_ExtendedString& astorageformat);
   
   //! the document is saved in a file.
   Standard_EXPORT Standard_Boolean IsSaved() const;
   
   //! returns True if document differs from the state of last saving.
   //! this method have to be called only working in the transaction mode
     Standard_Boolean IsChanged() const;
   
   //! This method have to be called to show document that it has been saved
     void SetSaved();
   
   //! Say to document what it is not saved.
   //! Use value, returned earlier by GetSavedTime().
     void SetSavedTime (const Standard_Integer theTime);
   
   //! Returns value of <mySavedTime> to be used later in SetSavedTime()
     Standard_Integer GetSavedTime() const;
   
   //! raise if <me> is not saved.
   Standard_EXPORT TCollection_ExtendedString GetName() const;
   
   //! returns the OS  path of the  file, in which one <me> is
   //! saved. Raise an exception if <me> is not saved.
   Standard_EXPORT TCollection_ExtendedString GetPath() const;
   
   Standard_EXPORT void SetData (const Handle(TDF_Data)& data);
   
   Standard_EXPORT Handle(TDF_Data) GetData() const;
   
   //! Returns the main label in this data framework.
   //! By definition, this is the label with the entry 0:1.
   Standard_EXPORT TDF_Label Main() const;
   
   //! Returns True if the main label has no attributes
   Standard_EXPORT Standard_Boolean IsEmpty() const;
   
   //! Returns False if the  document has been modified
   //! but not recomputed.
   Standard_EXPORT Standard_Boolean IsValid() const;
   
   //! Notify the label as modified, the Document becomes UnValid.
   //! returns True if <L> has been notified as modified.
   Standard_EXPORT void SetModified (const TDF_Label& L);
   
   //! Remove all modifications. After this call The document
   //! becomesagain Valid.
   Standard_EXPORT void PurgeModified();
   
   //! Returns the labels which have been modified in
   //! this document.
   Standard_EXPORT const TDF_LabelMap& GetModified() const;
   
   //! Launches a new command. This command may be undone.
   Standard_EXPORT void NewCommand();
   
   //! returns True if a Command transaction is open in the curret .
   Standard_EXPORT Standard_Boolean HasOpenCommand() const;
   
   //! Opens a new command transaction in this document.
   //! You can use HasOpenCommand to see whether a command is already open.
   //! Exceptions
   //! Standard_DomainError if a command is already open in this document.
   Standard_EXPORT void OpenCommand();
   
   //! Commits documents transactions and fills the
   //! transaction manager with documents that have
   //! been changed during the transaction.
   //! If no command transaction is open, nothing is done.
   //! Returns True if a new delta has been added to myUndos.
   Standard_EXPORT Standard_Boolean CommitCommand();
   
   //! Abort the  Command  transaction. Does nothing If there is
   //! no Command transaction open.
   Standard_EXPORT void AbortCommand();
   
   //! The current limit on the number of undos
   Standard_EXPORT Standard_Integer GetUndoLimit() const;
   
   //! Set the  limit on  the number of  Undo Delta  stored 0
   //! will disable  Undo  on the  document A negative  value
   //! means no limit. Note that by default Undo is disabled.
   //! Enabling  it will  take effect with  the next  call to
   //! NewCommand. Of course this limit is the same for Redo
   Standard_EXPORT void SetUndoLimit (const Standard_Integer L);
   
   //! Remove all stored Undos and Redos
   Standard_EXPORT void ClearUndos();
   
   //! Remove all stored Redos
   Standard_EXPORT void ClearRedos();
   
   //! Returns the number of undos stored in this
   //! document. If this figure is greater than 0, the method Undo
   //! can be used.
   Standard_EXPORT Standard_Integer GetAvailableUndos() const;
   
   //! Will UNDO  one step, returns  False if no undo was
   //! done (Undos == 0).
   //! Otherwise, true is returned and one step in the
   //! list of undoes is undone.
   Standard_EXPORT Standard_Boolean Undo();
   
   //! Returns the number of redos stored in this
   //! document. If this figure is greater than 0, the method Redo
   //! can be used.
   Standard_EXPORT Standard_Integer GetAvailableRedos() const;
   
   //! Will REDO  one step, returns  False if no redo was
   //! done (Redos == 0).
   //! Otherwise, true is returned, and one step in the list of redoes is done again.
   Standard_EXPORT Standard_Boolean Redo();
   
   Standard_EXPORT const TDF_DeltaList& GetUndos() const;
   
   Standard_EXPORT const TDF_DeltaList& GetRedos() const;
   
   //! Removes the first undo in the list of document undos.
   //! It is used in the application when the undo limit is exceed.
   Standard_EXPORT void RemoveFirstUndo();
   
   //! Initializes the procedure of delta compaction
   //! Returns false if there is no delta to compact
   //! Marks the last delta as a "from" delta
   Standard_EXPORT Standard_Boolean InitDeltaCompaction();
   
   //! Performs the procedure of delta compaction
   //! Makes all deltas starting from "from" delta
   //! till the last one to be one delta.
   Standard_EXPORT Standard_Boolean PerformDeltaCompaction();
   
   //! Set   modifications on  labels  impacted  by  external
   //! references to the entry.  The document becomes invalid
   //! and must be recomputed.
   Standard_EXPORT void UpdateReferences (const TCollection_AsciiString& aDocEntry);
   
   //! Recompute if the document was  not valid and propagate
   //! the reccorded modification.
   Standard_EXPORT void Recompute();
   
   //! This method Update   will be called
   //! to signal the end   of the modified references list.
   //! The    document     should    be  recomputed     and
   //! UpdateFromDocuments  should be called.  Update should
   //! returns True in case  of success, false otherwise.  In
   //! case of Failure, additional information can be given in
   //! ErrorString.
   //! Update the document by propagation
   //! ==================================
   //! Update   the    document    from   internal   stored
   //! modifications.   If   you   want  to   undoing  this
   //! operation, please call NewCommand before.
   //! to change format (advanced programming)
   //! ================
   Standard_EXPORT virtual void Update (const Handle(CDM_Document)& aToDocument, const Standard_Integer aReferenceIdentifier, const Standard_Address aModifContext) Standard_OVERRIDE;
 
   Standard_EXPORT virtual TCollection_ExtendedString StorageFormat() const Standard_OVERRIDE;
 
   //! Sets saving mode for empty labels. If Standard_True, empty labels will be saved.
   void SetEmptyLabelsSavingMode (const Standard_Boolean isAllowed);
 
   //! Returns saving mode for empty labels.
   Standard_Boolean EmptyLabelsSavingMode() const;
 
   //! methods for the nested transaction mode
   Standard_EXPORT virtual void ChangeStorageFormat (const TCollection_ExtendedString& newStorageFormat);
 
   //! Sets nested transaction mode if isAllowed == Standard_True
   void SetNestedTransactionMode (const Standard_Boolean isAllowed = Standard_True);
 
   //! Returns Standard_True if mode is set
   Standard_Boolean IsNestedTransactionMode() const;
 
   //! if theTransactionOnly is True changes is denied outside transactions
   void SetModificationMode (const Standard_Boolean theTransactionOnly);
 
   //! returns True if changes allowed only inside transactions
   Standard_Boolean ModificationMode() const;
 
   //! Prepares document for closing
   Standard_EXPORT virtual void BeforeClose();
 
   //! Returns version of the format to be used to store the document
   Standard_EXPORT TDocStd_FormatVersion StorageFormatVersion() const;
 
   //! Sets version of the format to be used to store the document
   Standard_EXPORT void ChangeStorageFormatVersion(const TDocStd_FormatVersion theVersion);
 
   //! Returns current storage format version of the document.
   Standard_EXPORT static TDocStd_FormatVersion CurrentStorageFormatVersion();
 
   //! Dumps the content of me into the stream
   Standard_EXPORT void DumpJson (Standard_OStream& theOStream, Standard_Integer theDepth = -1) const;
 
 
 
 
   DEFINE_STANDARD_RTTIEXT(TDocStd_Document,CDM_Document)
 
 protected:
 
   
   //! Returns Standard_True done
   Standard_EXPORT virtual Standard_Boolean CommitTransaction();
   
   Standard_EXPORT virtual void AbortTransaction();
   
   //! methods for protection of changes outside transactions
   Standard_EXPORT virtual void OpenTransaction();
 
   TCollection_ExtendedString myStorageFormat;
   TDF_DeltaList myUndos;
   TDF_DeltaList myRedos;
 
 
 private:
 
   
   //! Appends delta to the first delta in the myUndoFILO
   //! private methods
   //! ===============
   Standard_EXPORT static void AppendDeltaToTheFirst (const Handle(TDocStd_CompoundDelta)& theDelta1, const Handle(TDF_Delta)& theDelta2);
 
   Handle(TDF_Data) myData;
   Standard_Integer myUndoLimit;
   TDF_Transaction myUndoTransaction;
   Handle(TDF_Delta) myFromUndo;
   Handle(TDF_Delta) myFromRedo;
   Standard_Integer mySaveTime;
   Standard_Boolean myIsNestedTransactionMode;
   TDF_DeltaList myUndoFILO;
   Standard_Boolean myOnlyTransactionModification;
   Standard_Boolean mySaveEmptyLabels;
   TDocStd_FormatVersion myStorageFormatVersion;
 
 };
 
 
 #include <TDocStd_Document.lxx>
 
 
 
 
 
 #endif // _TDocStd_Document_HeaderFile

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