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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkSQLiteDatabase.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
/*-------------------------------------------------------------------------
  Copyright 2008 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
  the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------*/
// .NAME vtkSQLiteDatabase - maintain a connection to an SQLite database
//
// .SECTION Description
//
// SQLite (http://www.sqlite.org) is a public-domain SQL database
// written in C++.  It's small, fast, and can be easily embedded
// inside other applications.  Its databases are stored in files.
//
// This class provides a VTK interface to SQLite.  You do not need to
// download any external libraries: we include a copy of SQLite 3.3.16
// in VTK/Utilities/vtksqlite.  
//
// If you want to open a database that stays in memory and never gets
// written to disk, pass in the URL 'sqlite://:memory:'; otherwise,
// specifiy the file path by passing the URL 'sqlite://<file_path>'.
//
// .SECTION Thanks
// Thanks to Andrew Wilson and Philippe Pebay from Sandia National 
// Laboratories for implementing this class.
//
// .SECTION See Also
// vtkSQLiteQuery

#ifndef __vtkSQLiteDatabase_h
#define __vtkSQLiteDatabase_h

#include "vtkSQLDatabase.h"

class vtkSQLQuery;
class vtkSQLiteQuery;
class vtkStringArray;
struct sqlite3;

class VTK_IO_EXPORT vtkSQLiteDatabase : public vtkSQLDatabase
{
  //BTX
  friend class vtkSQLiteQuery;
  //ETX

public:
  vtkTypeMacro(vtkSQLiteDatabase, vtkSQLDatabase);
  void PrintSelf(ostream& os, vtkIndent indent);
  static vtkSQLiteDatabase *New();

  //BTX
  enum {
    USE_EXISTING,
    USE_EXISTING_OR_CREATE,
    CREATE_OR_CLEAR,
    CREATE
  };
  //ETX

  // Description:
  // Open a new connection to the database.  You need to set the
  // filename before calling this function.  Returns true if the
  // database was opened successfully; false otherwise.
  // - USE_EXISTING (default) - Fail if the file does not exist.
  // - USE_EXISTING_OR_CREATE - Create a new file if necessary.
  // - CREATE_OR_CLEAR - Create new or clear existing file.
  // - CREATE - Create new, fail if file exists.
  bool Open(const char* password);
  bool Open(const char* password, int mode);

  // Description:
  // Close the connection to the database.
  void Close();
  
  // Description:
  // Return whether the database has an open connection
  bool IsOpen();

  // Description:
  // Return an empty query on this database.
  vtkSQLQuery* GetQueryInstance();
  
  // Description:
  // Get the list of tables from the database
  vtkStringArray* GetTables();
    
  // Description:
  // Get the list of fields for a particular table
  vtkStringArray* GetRecord(const char *table);

  // Description:
  // Return whether a feature is supported by the database.
  bool IsSupported(int feature);
  
  // Description:
  // Did the last operation generate an error
  bool HasError();
  
  // Description:
  // Get the last error text from the database
  const char* GetLastErrorText();
  
  // Description:
  // String representing database type (e.g. "sqlite").
  vtkGetStringMacro(DatabaseType);

  // Description:
  // String representing the database filename.
  vtkGetStringMacro(DatabaseFileName);
  vtkSetStringMacro(DatabaseFileName);
  
  // Description:
  // Get the URL of the database.
  virtual vtkStdString GetURL();

  // Description:
  // Return the SQL string with the syntax to create a column inside a
  // "CREATE TABLE" SQL statement.
  // NB: this method implements the SQLite-specific syntax:
  // <column name> <column type> <column attributes>
  virtual vtkStdString GetColumnSpecification( vtkSQLDatabaseSchema* schema,
                                               int tblHandle,
                                               int colHandle );
 
protected:
  vtkSQLiteDatabase();
  ~vtkSQLiteDatabase();

  // Description:
  // Overridden to determine connection parameters given the URL. 
  // This is called by CreateFromURL() to initialize the instance.
  // Look at CreateFromURL() for details about the URL format.
  virtual bool ParseURL(const char* url);

private:
  sqlite3 *SQLiteInstance;
  
  // We want this to be private, a user of this class
  // should not be setting this for any reason
  vtkSetStringMacro(DatabaseType);

  vtkStringArray *Tables;
  
  char* DatabaseType;
  char* DatabaseFileName;

  vtkStdString TempURL;
  
  vtkSQLiteDatabase(const vtkSQLiteDatabase &); // Not implemented.
  void operator=(const vtkSQLiteDatabase &); // Not implemented.
};

#endif // __vtkSQLiteDatabase_h