xref: /trunk/main/connectivity/source/drivers/dbase/DIndexIter.cxx (revision 9b5730f6ddef7eb82608ca4d31dc0d7678e652cf)

/**************************************************************
 *
 * 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
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/



// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_connectivity.hxx"
#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;
using namespace ::com::sun::star::sdb;
//==================================================================
// OIndexIterator
//==================================================================
//------------------------------------------------------------------
OIndexIterator::~OIndexIterator()
{
    //  m_pIndex->UnLock();
    m_pIndex->release();
}

//------------------------------------------------------------------
sal_uIntPtr OIndexIterator::First()
{
    return Find(sal_True);
}

//------------------------------------------------------------------
sal_uIntPtr OIndexIterator::Next()
{
    return Find(sal_False);
}
//------------------------------------------------------------------
sal_uIntPtr OIndexIterator::Find(sal_Bool bFirst)
{
    //  ONDXIndex* m_pIndex = GetNDXIndex();

    sal_uIntPtr nRes = STRING_NOTFOUND;
//  if (!m_pIndex->IsOpen())
//      return nRes;

    if (bFirst)
    {
        m_aRoot = m_pIndex->getRoot();
        m_aCurLeaf = NULL;
    }

    if (!m_pOperator)
    {
        // Vorbereitung , auf kleinstes Element positionieren
        if (bFirst)
        {
            ONDXPage* pPage = m_aRoot;
            while (pPage && !pPage->IsLeaf())
                pPage = pPage->GetChild(m_pIndex);

            m_aCurLeaf = pPage;
            m_nCurNode = NODE_NOTFOUND;
        }
        ONDXKey* pKey = GetNextKey();
        nRes = pKey ? pKey->GetRecord() : STRING_NOTFOUND;
    }
    else if (m_pOperator->IsA(TYPE(OOp_ISNOTNULL)))
        nRes = GetNotNull(bFirst);
    else if (m_pOperator->IsA(TYPE(OOp_ISNULL)))
        nRes = GetNull(bFirst);
    else if (m_pOperator->IsA(TYPE(OOp_LIKE)))
        nRes = GetLike(bFirst);
    else if (m_pOperator->IsA(TYPE(OOp_COMPARE)))
        nRes = GetCompare(bFirst);

    return nRes;
}

//------------------------------------------------------------------
ONDXKey* OIndexIterator::GetFirstKey(ONDXPage* pPage, const OOperand& rKey)
{
    // sucht den vorgegeben key
    // Besonderheit: gelangt der Algorithmus ans Ende
    // wird immer die aktuelle Seite und die Knotenposition vermerkt
    // auf die die Bedingung <= zutrifft
    // dieses findet beim Insert besondere Beachtung
    //  ONDXIndex* m_pIndex = GetNDXIndex();
    OOp_COMPARE aTempOp(SQLFilterOperator::GREATER);
    sal_uInt16 i = 0;

    if (pPage->IsLeaf())
    {
        // im blatt wird die eigentliche Operation ausgefuehrt, sonst die 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 = NULL;
    if (!pPage->IsLeaf())
    {
        // weiter absteigen
        ONDXPagePtr aPage = (i==0) ? pPage->GetChild(m_pIndex)
                                     : ((*pPage)[i-1]).GetChild(m_pIndex, pPage);
        pFoundKey = aPage.Is() ? GetFirstKey(aPage, rKey) : NULL;
    }
    else if (i == pPage->Count())
    {
        pFoundKey = NULL;
    }
    else
    {
        pFoundKey = &(*pPage)[i].GetKey();
        if (!m_pOperator->operate(pFoundKey,&rKey))
            pFoundKey = NULL;

        m_aCurLeaf = pPage;
        m_nCurNode = pFoundKey ? i : i - 1;
    }
    return pFoundKey;
}

//------------------------------------------------------------------
sal_uIntPtr OIndexIterator::GetCompare(sal_Bool bFirst)
{
    ONDXKey* pKey = NULL;
    //  ONDXIndex* m_pIndex = GetNDXIndex();
    sal_Int32 ePredicateType = PTR_CAST(file::OOp_COMPARE,m_pOperator)->getPredicateType();

    if (bFirst)
    {
        // Vorbereitung , auf kleinstes Element positionieren
        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_pIndex);

                m_aCurLeaf = pPage;
                m_nCurNode = NODE_NOTFOUND;
        }


        switch (ePredicateType)
        {
            case SQLFilterOperator::NOT_EQUAL:
                while ( ( ( pKey = GetNextKey() ) != NULL ) && !m_pOperator->operate(pKey,m_pOperand)) ;
                break;
            case SQLFilterOperator::LESS:
                while ( ( ( pKey = GetNextKey() ) != NULL ) && pKey->getValue().isNull()) ;
                break;
            case SQLFilterOperator::LESS_EQUAL:
                while ( ( pKey = GetNextKey() ) != NULL ) ;
                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() ) != NULL ) && !m_pOperator->operate(pKey,m_pOperand)) ;
        }
    }
    else
    {
        switch (ePredicateType)
        {
            case SQLFilterOperator::NOT_EQUAL:
                while ( ( ( pKey = GetNextKey() ) != NULL ) && !m_pOperator->operate(pKey,m_pOperand))
                    ;
                break;
            case SQLFilterOperator::LESS:
            case SQLFilterOperator::LESS_EQUAL:
            case SQLFilterOperator::EQUAL:
                if ( ( ( pKey = GetNextKey() ) == NULL )  || !m_pOperator->operate(pKey,m_pOperand))
                {
                    pKey = NULL;
                    m_aCurLeaf = NULL;
                }
                break;
            case SQLFilterOperator::GREATER_EQUAL:
            case SQLFilterOperator::GREATER:
                pKey = GetNextKey();
        }
    }

    return pKey ? pKey->GetRecord() : STRING_NOTFOUND;
}

//------------------------------------------------------------------
sal_uIntPtr OIndexIterator::GetLike(sal_Bool bFirst)
{
    //  ONDXIndex* m_pIndex = GetNDXIndex();
    if (bFirst)
    {
        ONDXPage* pPage = m_aRoot;

        while (pPage && !pPage->IsLeaf())
            pPage = pPage->GetChild(m_pIndex);

        m_aCurLeaf = pPage;
        m_nCurNode = NODE_NOTFOUND;
    }

    ONDXKey* pKey;
    while ( ( ( pKey = GetNextKey() ) != NULL ) && !m_pOperator->operate(pKey,m_pOperand))
        ;
    return pKey ? pKey->GetRecord() : STRING_NOTFOUND;
}

//------------------------------------------------------------------
sal_uIntPtr OIndexIterator::GetNull(sal_Bool bFirst)
{
    //  ONDXIndex* m_pIndex = GetNDXIndex();
    if (bFirst)
    {
        ONDXPage* pPage = m_aRoot;
        while (pPage && !pPage->IsLeaf())
            pPage = pPage->GetChild(m_pIndex);

        m_aCurLeaf = pPage;
        m_nCurNode = NODE_NOTFOUND;
    }

    ONDXKey* pKey;
    if ( ( ( pKey = GetNextKey() ) == NULL ) || !pKey->getValue().isNull())
    {
        pKey = NULL;
        m_aCurLeaf = NULL;
    }
    return pKey ? pKey->GetRecord() : STRING_NOTFOUND;
}

//------------------------------------------------------------------
sal_uIntPtr OIndexIterator::GetNotNull(sal_Bool bFirst)
{
    ONDXKey* pKey;
    //  ONDXIndex* m_pIndex = GetNDXIndex();
    if (bFirst)
    {
        // erst alle NULL werte abklappern
        for (sal_uIntPtr nRec = GetNull(bFirst);
             nRec != STRING_NOTFOUND;
             nRec = GetNull(sal_False))
                 ;
        pKey = m_aCurLeaf.Is() ? &(*m_aCurLeaf)[m_nCurNode].GetKey() : NULL;
    }
    else
        pKey = GetNextKey();

    return pKey ? pKey->GetRecord() : STRING_NOTFOUND;
}

//------------------------------------------------------------------
ONDXKey* OIndexIterator::GetNextKey()
{
    //  ONDXIndex* m_pIndex = GetNDXIndex();
    if (m_aCurLeaf.Is() && ((++m_nCurNode) >= m_aCurLeaf->Count()))
    {
        ONDXPage* pPage = m_aCurLeaf;
        // naechste Seite suchen
        while (pPage)
        {
            ONDXPage* pParentPage = pPage->GetParent();
            if (pParentPage)
            {
                sal_uInt16 nPos = pParentPage->Search(pPage);
                if (nPos != pParentPage->Count() - 1)
                {   // Seite gefunden
                    pPage = (*pParentPage)[nPos+1].GetChild(m_pIndex,pParentPage);
                    break;
                }
            }
            pPage = pParentPage;
        }

        // jetzt wieder zum Blatt
        while (pPage && !pPage->IsLeaf())
            pPage = pPage->GetChild(m_pIndex);

        m_aCurLeaf = pPage;
        m_nCurNode = 0;
    }
    return m_aCurLeaf.Is() ? &(*m_aCurLeaf)[m_nCurNode].GetKey() : NULL;
}