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/* -*- 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 .
*/
#include <dbase/DIndexIter.hxx>
#include <com/sun/star/sdb/SQLFilterOperator.hpp>
using namespace ::com::sun::star::sdb;
using namespace connectivity;
using namespace connectivity::dbase;
using namespace connectivity::file;
// OIndexIterator
OIndexIterator::~OIndexIterator()
{
}
sal_uInt32 OIndexIterator::First()
{
return Find(true);
}
sal_uInt32 OIndexIterator::Next()
{
return Find(false);
}
sal_uInt32 OIndexIterator::Find(bool bFirst)
{
sal_uInt32 nRes = NODE_NOTFOUND;
if (bFirst)
{
m_aRoot = m_xIndex->getRoot();
m_aCurLeaf.Clear();
}
if (!m_pOperator)
{
// Preparation, position on the smallest element
if (bFirst)
{
ONDXPage* pPage = m_aRoot;
while (pPage && !pPage->IsLeaf())
pPage = pPage->GetChild(m_xIndex.get());
m_aCurLeaf = pPage;
m_nCurNode = NODE_NOTFOUND;
}
ONDXKey* pKey = GetNextKey();
nRes = pKey ? pKey->GetRecord() : NODE_NOTFOUND;
}
else if (dynamic_cast<const OOp_ISNOTNULL *>(m_pOperator) != nullptr)
nRes = GetNotNull(bFirst);
else if (dynamic_cast<const OOp_ISNULL *>(m_pOperator) != nullptr)
nRes = GetNull(bFirst);
else if (dynamic_cast<const OOp_LIKE *>(m_pOperator) != nullptr)
nRes = GetLike(bFirst);
else if (dynamic_cast<const OOp_COMPARE *>(m_pOperator) != nullptr)
nRes = GetCompare(bFirst);
return nRes;
}
ONDXKey* OIndexIterator::GetFirstKey(ONDXPage* pPage, const OOperand& rKey)
{
// searches a given key
// Speciality: At the end of the algorithm
// the actual page and the position of the node which fulfil the
// '<='-condition are saved. this is considered for inserts.
// ONDXIndex* m_pIndex = GetNDXIndex();
OOp_COMPARE aTempOp(SQLFilterOperator::GREATER);
sal_uInt16 i = 0;
if (pPage->IsLeaf())
{
// in the leaf the actual operation is run, otherwise temp. (>)
while (i < pPage->Count() && !m_pOperator->operate(&((*pPage)[i]).GetKey(),&rKey))
i++;
}
else
while (i < pPage->Count() && !aTempOp.operate(&((*pPage)[i]).GetKey(),&rKey))
i++;
ONDXKey* pFoundKey = nullptr;
if (!pPage->IsLeaf())
{
// descend further
ONDXPagePtr aPage = (i==0) ? pPage->GetChild(m_xIndex.get())
: ((*pPage)[i-1]).GetChild(m_xIndex.get(), pPage);
pFoundKey = aPage.Is() ? GetFirstKey(aPage, rKey) : nullptr;
}
else if (i == pPage->Count())
{
pFoundKey = nullptr;
}
else
{
pFoundKey = &(*pPage)[i].GetKey();
if (!m_pOperator->operate(pFoundKey,&rKey))
pFoundKey = nullptr;
m_aCurLeaf = pPage;
m_nCurNode = pFoundKey ? i : i - 1;
}
return pFoundKey;
}
sal_uInt32 OIndexIterator::GetCompare(bool bFirst)
{
ONDXKey* pKey = nullptr;
sal_Int32 ePredicateType = dynamic_cast<file::OOp_COMPARE&>(*m_pOperator).getPredicateType();
if (bFirst)
{
// Preparation, position on the smallest element
ONDXPage* pPage = m_aRoot;
switch (ePredicateType)
{
case SQLFilterOperator::NOT_EQUAL:
case SQLFilterOperator::LESS:
case SQLFilterOperator::LESS_EQUAL:
while (pPage && !pPage->IsLeaf())
pPage = pPage->GetChild(m_xIndex.get());
m_aCurLeaf = pPage;
m_nCurNode = NODE_NOTFOUND;
}
switch (ePredicateType)
{
case SQLFilterOperator::NOT_EQUAL:
while ( ( ( pKey = GetNextKey() ) != nullptr ) && !m_pOperator->operate(pKey,m_pOperand)) ;
break;
case SQLFilterOperator::LESS:
while ( ( ( pKey = GetNextKey() ) != nullptr ) && pKey->getValue().isNull()) ;
break;
case SQLFilterOperator::LESS_EQUAL:
while ( ( pKey = GetNextKey() ) != nullptr ) ;
break;
case SQLFilterOperator::GREATER_EQUAL:
case SQLFilterOperator::EQUAL:
pKey = GetFirstKey(m_aRoot,*m_pOperand);
break;
case SQLFilterOperator::GREATER:
pKey = GetFirstKey(m_aRoot,*m_pOperand);
if ( !pKey )
while ( ( ( pKey = GetNextKey() ) != nullptr ) && !m_pOperator->operate(pKey,m_pOperand)) ;
}
}
else
{
switch (ePredicateType)
{
case SQLFilterOperator::NOT_EQUAL:
while ( ( ( pKey = GetNextKey() ) != nullptr ) && !m_pOperator->operate(pKey,m_pOperand))
;
break;
case SQLFilterOperator::LESS:
case SQLFilterOperator::LESS_EQUAL:
case SQLFilterOperator::EQUAL:
if ( ( ( pKey = GetNextKey() ) == nullptr ) || !m_pOperator->operate(pKey,m_pOperand))
{
pKey = nullptr;
m_aCurLeaf.Clear();
}
break;
case SQLFilterOperator::GREATER_EQUAL:
case SQLFilterOperator::GREATER:
pKey = GetNextKey();
}
}
return pKey ? pKey->GetRecord() : NODE_NOTFOUND;
}
sal_uInt32 OIndexIterator::GetLike(bool bFirst)
{
if (bFirst)
{
ONDXPage* pPage = m_aRoot;
while (pPage && !pPage->IsLeaf())
pPage = pPage->GetChild(m_xIndex.get());
m_aCurLeaf = pPage;
m_nCurNode = NODE_NOTFOUND;
}
ONDXKey* pKey;
while ( ( ( pKey = GetNextKey() ) != nullptr ) && !m_pOperator->operate(pKey,m_pOperand))
;
return pKey ? pKey->GetRecord() : NODE_NOTFOUND;
}
sal_uInt32 OIndexIterator::GetNull(bool bFirst)
{
if (bFirst)
{
ONDXPage* pPage = m_aRoot;
while (pPage && !pPage->IsLeaf())
pPage = pPage->GetChild(m_xIndex.get());
m_aCurLeaf = pPage;
m_nCurNode = NODE_NOTFOUND;
}
ONDXKey* pKey;
if ( ( ( pKey = GetNextKey() ) == nullptr ) || !pKey->getValue().isNull())
{
pKey = nullptr;
m_aCurLeaf.Clear();
}
return pKey ? pKey->GetRecord() : NODE_NOTFOUND;
}
sal_uInt32 OIndexIterator::GetNotNull(bool bFirst)
{
ONDXKey* pKey;
if (bFirst)
{
// go through all NULL values first
for (sal_uInt32 nRec = GetNull(bFirst);
nRec != NODE_NOTFOUND;
nRec = GetNull(false))
;
pKey = m_aCurLeaf.Is() ? &(*m_aCurLeaf)[m_nCurNode].GetKey() : nullptr;
}
else
pKey = GetNextKey();
return pKey ? pKey->GetRecord() : NODE_NOTFOUND;
}
ONDXKey* OIndexIterator::GetNextKey()
{
if (m_aCurLeaf.Is() && ((++m_nCurNode) >= m_aCurLeaf->Count()))
{
ONDXPage* pPage = m_aCurLeaf;
// search next page
while (pPage)
{
ONDXPage* pParentPage = pPage->GetParent();
if (pParentPage)
{
sal_uInt16 nPos = pParentPage->Search(pPage);
if (nPos != pParentPage->Count() - 1)
{ // page found
pPage = (*pParentPage)[nPos+1].GetChild(m_xIndex.get(),pParentPage);
break;
}
}
pPage = pParentPage;
}
// now go on with leaf
while (pPage && !pPage->IsLeaf())
pPage = pPage->GetChild(m_xIndex.get());
m_aCurLeaf = pPage;
m_nCurNode = 0;
}
return m_aCurLeaf.Is() ? &(*m_aCurLeaf)[m_nCurNode].GetKey() : nullptr;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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