xref: /aoo42x/main/connectivity/source/inc/TSkipDeletedSet.hxx (revision 07a3d7f1)

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 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
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#ifndef CONNECTIVITY_SKIPDELETEDSSET_HXX
#define CONNECTIVITY_SKIPDELETEDSSET_HXX

#include "TResultSetHelper.hxx"
#include <rtl/alloc.h>
#include <hash_map>
#include <vector>
#include "connectivity/dbtoolsdllapi.hxx"

namespace connectivity
{
	/**
		the class OSkipDeletedSet supports a general method to skip deleted rows
	*/
	class OOO_DLLPUBLIC_DBTOOLS OSkipDeletedSet
	{
		::std::vector<sal_Int32>	            m_aBookmarksPositions;// vector of iterators to position map, the order is the logical position
		IResultSetHelper*						m_pHelper;			  // used for moving in the resultset
        bool                                    m_bDeletedVisible;

		sal_Bool	moveAbsolute(sal_Int32 _nOffset,sal_Bool _bRetrieveData);
	public:
		OSkipDeletedSet(IResultSetHelper* _pHelper);
		~OSkipDeletedSet();

		inline static void * SAL_CALL operator new( size_t nSize ) SAL_THROW( () )
			{ return ::rtl_allocateMemory( nSize ); }
		inline static void * SAL_CALL operator new( size_t,void* _pHint ) SAL_THROW( () )
			{ return _pHint; }
		inline static void SAL_CALL operator delete( void * pMem ) SAL_THROW( () )
			{ ::rtl_freeMemory( pMem ); }
		inline static void SAL_CALL operator delete( void *,void* ) SAL_THROW( () )
			{  }

		/**
			skipDeleted moves the resultset to the position defined by the parameters
			it guarantees that the row isn't deleted
				@param
					IResultSetHelper::Movement	_eCursorPosition		in which direction the resultset should be moved
					sal_Int32					_nOffset				the position relativ to the movement
					sal_Bool					_bRetrieveData			is true when the current row should be filled which data
				@return
					true when the movement was successful otherwise false
		*/
		sal_Bool	skipDeleted(IResultSetHelper::Movement _eCursorPosition, sal_Int32 _nOffset, sal_Bool _bRetrieveData);
		/**
			clear the map and the vector used in this class
		*/
		void		clear();
		/**
			getMappedPosition returns the mapped position of a logical position
			@param
				sal_Int32 _nBookmark	the logical position

			@return the mapped position
		*/
		sal_Int32	getMappedPosition(sal_Int32 _nBookmark) const;
		/**
			insertNewPosition adds a new position to the map
			@param
				sal_Int32 _nPos	the logical position
		*/
		void		insertNewPosition(sal_Int32 _nPos);
		/**
			deletePosition deletes this position from the map and decrement all following positions
			@param
				sal_Int32 _nPos	the logical position
		*/
		void		deletePosition(sal_Int32 _nPos);
		/**
			getLastPosition returns the last position
			@return the last position
		*/
		inline sal_Int32	getLastPosition() const { return m_aBookmarksPositions.size(); }
        inline void SetDeletedVisible(bool _bDeletedVisible) { m_bDeletedVisible = _bDeletedVisible; }
	};
}
#endif // CONNECTIVITY_SKIPDELETEDSSET_HXX