queryiter.hxx

Go to the documentation of this file.

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */
 
#pragma once
 
#include "address.hxx"
#include "global.hxx"
#include "scdllapi.h"
#include "queryparam.hxx"
#include "mtvelements.hxx"
#include "types.hxx"
 
struct ScComplexRefData;
class ScSortedRangeCache;
 
/*
Query-related iterators. There is one template class ScQueryCellIteratorBase
that implements most of the shared functionality, specific parts are done
by specializing the templates and then subclassing as the actual class to use.
A template is used for maximum performance, as that allows fast code specializing,
inlining, etc.
There are two template arguments:
* ScQueryCellIteratorAccess specifies how cells are accessed:
  + Direct - direct access to cells using mdds.
  + SortedCache - for accessing unsorted cells in a sorted way using ScSortedRangeCache.
* ScQueryCellIteratorType specifies the type of the query operation:
  + Generic - the generic lookup, used e.g. by VLOOKUP.
  + CountIf - faster implementation for COUNTIF(S).
 
Specific data should be in specific templated base classes, otherwise adding data
members would mean specializing the entire ScQueryCellIteratorBase. Some specific
functionality may also be implemented in the base classes or depending on the template
parameter.
*/
 
// Data and functionality for accessing cells in a specific way.
// Needs specialization, see ScQueryCellIteratorAccess::Direct for what is needed.
template< ScQueryCellIteratorAccess accessType >
class ScQueryCellIteratorAccessSpecific
{
};
 
// The implementation using linear direct mdds access.
template<>
class ScQueryCellIteratorAccessSpecific< ScQueryCellIteratorAccess::Direct >
{
protected:
    ScQueryCellIteratorAccessSpecific( ScDocument& rDocument, ScInterpreterContext& rContext,
        const ScQueryParam& rParam );
    // Initialize position for new column.
    void InitPos();
    // Increase position (next row).
    void IncPos();
    // Next mdds block. If access is not direct/linear, then
    // should call IncPos().
    void IncBlock();
 
    // These members needs to be available already in the base class.
    typedef sc::CellStoreType::const_position_type PositionType;
    PositionType maCurPos;
    ScQueryParam    maParam;
    ScDocument&     rDoc;
    ScInterpreterContext& mrContext;
    SCTAB           nTab;
    SCCOL           nCol;
    SCROW           nRow;
 
    class NonEmptyCellIndexer;
    typedef std::pair<ScRefCellValue, SCROW> BinarySearchCellType;
    static NonEmptyCellIndexer MakeBinarySearchIndexer(const sc::CellStoreType& rCells,
        SCROW nStartRow, SCROW nEndRow);
};
 
// The implementation using ScSortedRangeCache, which allows sorted iteration
// of unsorted cells.
template<>
class ScQueryCellIteratorAccessSpecific< ScQueryCellIteratorAccess::SortedCache >
{
public:
    void SetSortedRangeCache( const ScSortedRangeCache& cache );
    template<bool fast>
    bool IncPosImpl();
protected:
    ScQueryCellIteratorAccessSpecific( ScDocument& rDocument, ScInterpreterContext& rContext,
        const ScQueryParam& rParam );
    void InitPosStart();
    void InitPosFinish( SCROW beforeRow, SCROW lastRow );
    void IncPos() { IncPosImpl<false>(); }
    bool IncPosFast() { return IncPosImpl<true>(); }
    void IncBlock() { IncPos(); } // Cannot skip entire block, not linear.
 
    // These members needs to be available already in the base class.
    typedef sc::CellStoreType::const_position_type PositionType;
    PositionType maCurPos;
    ScQueryParam    maParam;
    ScDocument&     rDoc;
    ScInterpreterContext& mrContext;
    SCTAB           nTab;
    SCCOL           nCol;
    SCROW           nRow;
    const ScColumn* pColumn; // matching nCol, set by InitPos()
 
    const ScSortedRangeCache* sortedCache;
    size_t sortedCachePos;
    size_t sortedCachePosLast;
 
    class SortedCacheIndexer;
    typedef std::pair<ScRefCellValue, SCROW> BinarySearchCellType;
    SortedCacheIndexer MakeBinarySearchIndexer(const sc::CellStoreType& rCells,
        SCROW nStartRow, SCROW nEndRow);
};
 
// Data and functionality for specific types of query.
template< ScQueryCellIteratorType iteratorType >
class ScQueryCellIteratorTypeSpecific
{
protected:
    bool HandleItemFound(); // not implemented, needs specialization
};
 
// Shared code for query-based iterators. The main class.
template< ScQueryCellIteratorAccess accessType, ScQueryCellIteratorType queryType >
class ScQueryCellIteratorBase
    : public ScQueryCellIteratorAccessSpecific< accessType >
    , public ScQueryCellIteratorTypeSpecific< queryType >
{
    typedef ScQueryCellIteratorAccessSpecific< accessType > AccessBase;
    typedef ScQueryCellIteratorTypeSpecific< queryType > TypeBase;
protected:
    enum StopOnMismatchBits
    {
        nStopOnMismatchDisabled = 0x00,
        nStopOnMismatchEnabled  = 0x01,
        nStopOnMismatchOccurred  = 0x02,
        nStopOnMismatchExecuted = nStopOnMismatchEnabled | nStopOnMismatchOccurred
    };
 
    enum TestEqualConditionBits
    {
        nTestEqualConditionDisabled = 0x00,
        nTestEqualConditionEnabled  = 0x01,
        nTestEqualConditionMatched  = 0x02,
        nTestEqualConditionFulfilled = nTestEqualConditionEnabled | nTestEqualConditionMatched
    };
 
    sal_uInt8            nStopOnMismatch;
    sal_uInt8            nTestEqualCondition;
    bool            bAdvanceQuery;
    bool            bIgnoreMismatchOnLeadingStrings;
 
    // Make base members directly visible here (templated bases need 'this->').
    using AccessBase::maCurPos;
    using AccessBase::maParam;
    using AccessBase::rDoc;
    using AccessBase::mrContext;
    using AccessBase::nTab;
    using AccessBase::nCol;
    using AccessBase::nRow;
    using AccessBase::IncPos;
    using AccessBase::IncBlock;
    using typename AccessBase::BinarySearchCellType;
    using AccessBase::MakeBinarySearchIndexer;
    using TypeBase::HandleItemFound;
 
    void InitPos();
 
    // The actual query function. It will call HandleItemFound() for any matching type
    // and return if HandleItemFound() returns true.
    void PerformQuery();
 
    /* Only works if no regular expression is involved, only searches for rows in one column,
       and only the first query entry is considered with simple conditions SC_LESS,SC_LESS_EQUAL,
       SC_EQUAL (sorted ascending) or SC_GREATER,SC_GREATER_EQUAL (sorted descending). It
       delivers a starting point set to nRow, i.e. the last row that either matches the searched
       for value, or the last row that matches the condition. Continue with e.g. GetThis() and
       GetNext() afterwards. Returns false if the searched for value is not in the search range
       or if the range is not properly sorted, with nRow in that case set to the first row or after
       the last row. In that case use GetFirst().
    */
    bool BinarySearch( SCCOL col, bool forEqual = false );
 
    void            SetStopOnMismatch( bool bVal )
                        {
                            nStopOnMismatch = sal::static_int_cast<sal_uInt8>(bVal ? nStopOnMismatchEnabled :
                                nStopOnMismatchDisabled);
                        }
    bool            StoppedOnMismatch() const
                        { return nStopOnMismatch == nStopOnMismatchExecuted; }
 
    void            SetTestEqualCondition( bool bVal )
                        {
                            nTestEqualCondition = sal::static_int_cast<sal_uInt8>(bVal ?
                                nTestEqualConditionEnabled :
                                nTestEqualConditionDisabled);
                        }
    bool            IsEqualConditionFulfilled() const
                        { return nTestEqualCondition == nTestEqualConditionFulfilled; }
 
public:
                    ScQueryCellIteratorBase(ScDocument& rDocument, ScInterpreterContext& rContext, SCTAB nTable,
                                            const ScQueryParam& aParam, bool bMod);
                                        // when !bMod, the QueryParam has to be filled
                                        // (bIsString)
 
                    // increments all Entry.nField, if column
                    // changes, for ScInterpreter ScHLookup()
    void            SetAdvanceQueryParamEntryField( bool bVal )
                        { bAdvanceQuery = bVal; }
    void            AdvanceQueryParamEntryField();
};
 
 
template<>
class ScQueryCellIteratorTypeSpecific< ScQueryCellIteratorType::Generic >
{
protected:
    bool HandleItemFound();
    bool getThisResult;
};
 
// The generic query iterator, used e.g. by VLOOKUP.
template< ScQueryCellIteratorAccess accessType >
class ScQueryCellIterator
    : public ScQueryCellIteratorBase< accessType, ScQueryCellIteratorType::Generic >
{
    typedef ScQueryCellIteratorBase< accessType, ScQueryCellIteratorType::Generic > Base;
    // Make base members directly visible here (templated bases need 'this->').
    using Base::maParam;
    using Base::rDoc;
    using Base::mrContext;
    using Base::nTab;
    using Base::nCol;
    using Base::nRow;
    using Base::InitPos;
    using Base::IncPos;
    using Base::bIgnoreMismatchOnLeadingStrings;
    using Base::SetStopOnMismatch;
    using Base::SetTestEqualCondition;
    using Base::BinarySearch;
    using typename Base::PositionType;
    using Base::maCurPos;
    using Base::IsEqualConditionFulfilled;
    using Base::bAdvanceQuery;
    using Base::StoppedOnMismatch;
    using Base::nStopOnMismatch;
    using Base::nStopOnMismatchEnabled;
    using Base::nTestEqualCondition;
    using Base::nTestEqualConditionEnabled;
    using Base::PerformQuery;
    using Base::getThisResult;
 
    bool GetThis();
 
public:
    ScQueryCellIterator(ScDocument& rDocument, ScInterpreterContext& rContext, SCTAB nTable,
                        const ScQueryParam& aParam, bool bMod)
        : Base( rDocument, rContext, nTable, aParam, bMod ) {}
    bool GetFirst();
    bool GetNext();
    SCCOL GetCol() const { return nCol; }
    SCROW GetRow() const { return nRow; }
 
    bool            FindEqualOrSortedLastInRange( SCCOL& nFoundCol, SCROW& nFoundRow );
};
 
typedef ScQueryCellIterator< ScQueryCellIteratorAccess::Direct > ScQueryCellIteratorDirect;
 
class ScQueryCellIteratorSortedCache
    : public ScQueryCellIterator< ScQueryCellIteratorAccess::SortedCache >
{
    typedef ScQueryCellIterator< ScQueryCellIteratorAccess::SortedCache > Base;
public:
    ScQueryCellIteratorSortedCache(ScDocument& rDocument, ScInterpreterContext& rContext,
        SCTAB nTable, const ScQueryParam& aParam, bool bMod)
    : Base( rDocument, rContext, nTable, aParam, bMod ) {}
    // Returns true if this iterator can be used for the given query.
    static bool CanBeUsed(ScDocument& rDoc, const ScQueryParam& aParam,
        SCTAB nTab, const ScFormulaCell* cell, const ScComplexRefData* refData,
        ScInterpreterContext& context);
};
 
 
template<>
class ScQueryCellIteratorTypeSpecific< ScQueryCellIteratorType::CountIf >
{
protected:
    bool HandleItemFound();
    sal_uInt64 countIfCount;
};
 
// Used by ScInterpreter::ScCountIf.
template< ScQueryCellIteratorAccess accessType >
class ScCountIfCellIterator
    : public ScQueryCellIteratorBase< accessType, ScQueryCellIteratorType::CountIf >
{
protected:
    typedef ScQueryCellIteratorBase< accessType, ScQueryCellIteratorType::CountIf > Base;
    // Make base members directly visible here (templated bases need 'this->').
    using Base::maParam;
    using Base::rDoc;
    using Base::nTab;
    using Base::nCol;
    using Base::nRow;
    using Base::InitPos;
    using Base::PerformQuery;
    using Base::SetAdvanceQueryParamEntryField;
    using Base::countIfCount;
 
public:
    ScCountIfCellIterator(ScDocument& rDocument, ScInterpreterContext& rContext, SCTAB nTable,
                          const ScQueryParam& aParam, bool bMod)
        : Base( rDocument, rContext, nTable, aParam, bMod ) {}
    sal_uInt64 GetCount();
};
 
typedef ScCountIfCellIterator< ScQueryCellIteratorAccess::Direct > ScCountIfCellIteratorDirect;
 
class ScCountIfCellIteratorSortedCache
    : public ScCountIfCellIterator< ScQueryCellIteratorAccess::SortedCache >
{
    typedef ScCountIfCellIterator< ScQueryCellIteratorAccess::SortedCache > Base;
public:
    ScCountIfCellIteratorSortedCache(ScDocument& rDocument, ScInterpreterContext& rContext,
        SCTAB nTable, const ScQueryParam& aParam, bool bMod)
    : Base( rDocument, rContext, nTable, aParam, bMod ) {}
    // Returns true if this iterator can be used for the given query.
    static bool CanBeUsed(ScDocument& rDoc, const ScQueryParam& aParam,
        SCTAB nTab, const ScFormulaCell* cell, const ScComplexRefData* refData,
        ScInterpreterContext& context);
};
 
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */