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352 lines
9.9 KiB
352 lines
9.9 KiB
//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1994 - 1999.
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//
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// File: rowcomp.hxx
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//
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// Contents: Declaration of the row comparison classes
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//
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// Classes: CRowCompareVariant
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//
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// Templates: TRowCompare
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//
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// History: 31 Aug 1994 dlee Created
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//
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//--------------------------------------------------------------------------
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#pragma once
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#include <compare.hxx>
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#include <xbuffer.hxx>
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#include <shardbuf.hxx>
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#include <tblvarnt.hxx>
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#include "varntcmp.hxx"
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#include "pathstor.hxx"
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class CTableWindow;
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//+-------------------------------------------------------------------------
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//
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// Class: CRowCompare
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//
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// Purpose: Abstract class for row comparisons
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//
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// Notes: The comparison function should return (for ascending order)
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//
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// 1..cSortItems if Row1 > Row2,
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// 0 if same
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// -1..-cSortItems if Row1 < Row2
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//
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// Return the opposite for descending order.
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//
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// History: 8/24/94 dlee created
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//
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//--------------------------------------------------------------------------
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class CRowCompare
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{
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public:
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CRowCompare() {}
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virtual ~CRowCompare() {}
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virtual int Compare(TBL_OFF oRow1, TBL_OFF oRow2) = 0;
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};
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class CPathStore;
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//+-------------------------------------------------------------------------
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//
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// Class: CRowCompareVariant
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//
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// Purpose: Default case of row comparisons if a more optimal
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// special case is not used. Converts values to variants
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// and compares the variants. Also used if more than one
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// (not including WORKID) sort spec specified.
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//
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// Notes: This must be declared unwindable because it has embedded
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// unwindable objects.
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//
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//--------------------------------------------------------------------------
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class CRowCompareVariant : public CRowCompare
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{
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public:
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CRowCompareVariant(CTableWindow & TableWindow);
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virtual ~CRowCompareVariant();
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int Compare(TBL_OFF oRow1,
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TBL_OFF oRow2);
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int CompareObject(CRetriever & obj,
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TBL_OFF oRow2);
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enum EVariantSource { eNone, eCompressor, eBuffer, eNewx };
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private:
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void _FreeVariant(CTableColumn * pColumn,
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CTableVariant * pVar,
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EVariantSource eSource);
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void _MakeVariant(CTableColumn * pColumn,
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BYTE * pbRow,
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CTableVariant * pVar,
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EVariantSource & evSource);
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void _MakeVariant(CTableColumn * pColumn,
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CRetriever & obj,
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unsigned iProp);
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PROPVARIANT * _MakeVariant( unsigned iCol,
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XUseSharedBuffer & sharedBuf,
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CRetriever & obj );
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void _Cleanup1();
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void _Cleanup2();
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int _DoCompare(TBL_OFF oRow2);
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void _InitComparators( CSortSet const & sortSet );
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PATHID _GetPathId( const CTableColumn & col, BYTE * pbRow );
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BOOL _FastCompare( unsigned iCol, BYTE *pbRow1, BYTE * pbRow2,
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int & iComp );
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BOOL _FastCompare( unsigned iCol, CRetriever & obj,
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XUseSharedBuffer & sharedBuf,
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BYTE * pbRow2, int & iComp );
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unsigned _cProps;
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CTableWindow &_TableWindow;
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// Comparators for the columns
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XArray<CCompareVariants> _aComparator;
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// State data for the comparison.
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XArray<CTableVariant> _aVar1;
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XArray<CTableVariant> _aVar2;
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XArray<CTableVariant *> _apVar1;
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XArray<CTableVariant *> _apVar2;
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XArray<CTableColumn *> _apColumn;
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XArray<EVariantSource> _aVarFlags1;
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XArray<EVariantSource> _aVarFlags2;
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//
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// Used for quick path comparison.
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//
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CPathStore * _pPathStore;
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//
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// Temporary shared memory for the whole table.
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//
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CSharedBuffer & _sharedBuf;
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// Buffer used for CRetriever temporary data
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enum { maxcbBuffer = MAX_PATH * sizeof WCHAR };
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XBuffer<BYTE> _xBuffer;
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// Most recent row 1 identified by this member is cached
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WORKID _widCached;
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};
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//+-------------------------------------------------------------------------
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//
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// Template: TRowCompare
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//
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// Purpose: Special row comparator for inline values: values that are
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// stored in the row as opposed to variable-length or easily
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// compressed data that is stored out-of-line.
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//
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// Use of this template is just an optimization over using
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// CRowCompareVariant, in which data must be converted to a
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// variant before the comparison (which is slow).
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//
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// You can use this template if:
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// -- only one property is in the sort spec
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// -- the property value is stored inline
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// -- the property value datatype supports relational ops
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// -- length of the value is fixed and is not an array
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//
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//--------------------------------------------------------------------------
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template <class T> class TRowCompare : public CRowCompare
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{
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public:
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TRowCompare( CFixedVarTableWindowAllocator &Alloc,
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ULONG oData,
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ULONG dwOrder) :
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_Alloc( Alloc ),
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_oData( oData )
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{
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if (0 == (dwOrder & QUERY_SORTDESCEND /*DBSORTORDER_DESCEND*/ ))
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_iGT = 1; // ascending
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else
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_iGT = -1; // descending
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}
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~TRowCompare() {}
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int Compare( TBL_OFF oRow1,
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TBL_OFF oRow2 )
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{
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T t1 = * (T *) ((BYTE *) _Alloc.FixedPointer( oRow1 ) + _oData);
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T t2 = * (T *) ((BYTE *) _Alloc.FixedPointer( oRow2 ) + _oData);
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if (t1 > t2)
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return _iGT;
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if (t1 < t2)
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return -_iGT;
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return 0;
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}
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private:
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int _iGT; // return value if 1 > 2
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CFixedVarTableWindowAllocator &_Alloc; // allocator where rows are
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ULONG _oData; // offset in row where value resides
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};
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//+-------------------------------------------------------------------------
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//
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// Template: TRowCompareTwo
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//
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// Purpose: Same as TRowCompare, except that it also does a second
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// compare. A is compared first, then B.
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//
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// Rules for use of this template are the same as for
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// TRowCompare
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//
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//--------------------------------------------------------------------------
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template <class TA, class TB> class TRowCompareTwo : public CRowCompare
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{
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public:
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TRowCompareTwo( CFixedVarTableWindowAllocator &Alloc,
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ULONG oDataA,
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ULONG dwOrderA,
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ULONG oDataB,
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ULONG dwOrderB ) :
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_CompareA( Alloc, oDataA, dwOrderA ),
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_CompareB( Alloc, oDataB, dwOrderB ) {}
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~TRowCompareTwo() {}
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int Compare( TBL_OFF oRow1,
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TBL_OFF oRow2 )
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{
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int result = _CompareA.Compare( oRow1, oRow2 );
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if (0 == result)
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{
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// same first key -- now check the second key.
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// the * 2 means that it was the second column.
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result = 2 * _CompareB.Compare( oRow1, oRow2 );
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}
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return result;
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}
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private:
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TRowCompare<TA> _CompareA;
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TRowCompare<TB> _CompareB;
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};
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//+-------------------------------------------------------------------------
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//
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// Template: TRowCompareStringPlus
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//
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// Purpose: Same as TRowCompareTwo, except that the first key compared
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// is a wide string, then the parameterized type is compared.
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//
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//--------------------------------------------------------------------------
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template <class TB> class TRowCompareStringPlus : public CRowCompare
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{
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public:
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TRowCompareStringPlus( CFixedVarTableWindowAllocator &Alloc,
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ULONG oDataString,
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ULONG dwOrderString,
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ULONG oDataB,
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ULONG dwOrderB ) :
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_Alloc( Alloc ),
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_oDataString( oDataString ),
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_CompareB( Alloc, oDataB, dwOrderB )
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{
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if (0 == (dwOrderString & QUERY_SORTDESCEND /*DBSORTORDER_DESCEND*/ ))
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_iGTString = 1; // ascending
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else
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_iGTString = -1; // descending
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}
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~TRowCompareStringPlus() {}
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int Compare( TBL_OFF oRow1,
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TBL_OFF oRow2 )
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{
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WCHAR * p1 = * (WCHAR **) ((BYTE *) _Alloc.FixedPointer( oRow1 ) + _oDataString );
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WCHAR * p2 = * (WCHAR **) ((BYTE *) _Alloc.FixedPointer( oRow2 ) + _oDataString );
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// No string is every guaranteed to exist -- even path,
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// since a summary catalog may have VT_EMPTY, and a VPATH
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// is VT_EMPTY for non-web downlevel queries.
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if ( 0 == p1 )
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{
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if ( 0 == p2 )
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return 2 * _CompareB.Compare( oRow1, oRow2 );
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else
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return _iGTString;
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}
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else if ( 0 == p2 )
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{
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return -_iGTString;
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}
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int rc = CompareStringW( LOCALE_SYSTEM_DEFAULT,
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NORM_IGNORECASE,
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p1,
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-1,
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p2,
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-1 );
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// rc == 1, means less than
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// rc == 2, means equal
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// rc == 3, means greater than
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int result = rc - 2;
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if ( result > 0 )
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return _iGTString;
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if ( result < 0 )
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return -_iGTString;
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Win4Assert( 0 == result );
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// same first key -- now check the second key.
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// the * 2 means that it was the second column.
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return 2 * _CompareB.Compare( oRow1, oRow2 );
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}
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private:
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int _iGTString; // return value if 1 > 2
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CFixedVarTableWindowAllocator &_Alloc; // allocator where rows are
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ULONG _oDataString; // offset in row where value resides
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TRowCompare<TB> _CompareB;
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};
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