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84 lines
2.2 KiB
84 lines
2.2 KiB
//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1991 - 1992.
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//
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// File: SYNCUR.HXX
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//
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// Contents: Synonym Cursor
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//
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// Classes: CSynCursor
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//
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// History: 20-Jan-92 BarotszM and AmyA Created.
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//
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//----------------------------------------------------------------------------
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#pragma once
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#include <ocursor.hxx>
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#include <curheap.hxx>
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class COccCurStack;
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//+---------------------------------------------------------------------------
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//
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// Class: CSynCursor
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//
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// Purpose: Synonym cursor, merges several cursors into one ordered cursor
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// The cursors have different but semantically synonymous keys.
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//
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// History: 20-Jan-92 BarotszM and AmyA Created.
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// 19-Feb-92 AmyA Changed to be a COccCursor
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// instead of a CKeyCursor.
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// 23-Jun-94 SitaramR Removed _widMax.
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//
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// Notice: The cursor contains two heaps that order cursors according to
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// occurrences, [_occHeap], and work id's, [_widHeap].
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// All cursors in the occurrence heap have the same work id:
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// the current work id. If the occurrence heap is empty,
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// the top of the wid heap has current work id.
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//
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//----------------------------------------------------------------------------
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class CSynCursor: public COccCursor
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{
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public:
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CSynCursor( COccCurStack &curStack, WORKID widMax );
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~CSynCursor() {} // heaps are deleted
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WORKID WorkId();
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WORKID NextWorkId();
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OCCURRENCE Occurrence();
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OCCURRENCE NextOccurrence();
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ULONG OccurrenceCount();
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OCCURRENCE MaxOccurrence();
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ULONG WorkIdCount();
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ULONG HitCount();
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LONG Rank();
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LONG Hit();
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LONG NextHit();
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void RatioFinished ( ULONG& denom, ULONG& num );
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protected:
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BOOL ReplenishOcc();
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COccHeapOfOccCur _occHeap;
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CWidHeapOfOccCur _widHeap;
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};
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