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-rw-r--r--connectivity/source/drivers/dbase/DIndexIter.cxx302
1 files changed, 302 insertions, 0 deletions
diff --git a/connectivity/source/drivers/dbase/DIndexIter.cxx b/connectivity/source/drivers/dbase/DIndexIter.cxx
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+++ b/connectivity/source/drivers/dbase/DIndexIter.cxx
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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 )
+ if (m_pOperator->operate(pKey,m_pOperand))
+ break;
+ break;
+ case SQLFilterOperator::LESS:
+ while ( ( pKey = GetNextKey() ) != nullptr )
+ if (!pKey->getValue().isNull())
+ break;
+ 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 )
+ if (m_pOperator->operate(pKey,m_pOperand))
+ break;
+ }
+ }
+ else
+ {
+ switch (ePredicateType)
+ {
+ case SQLFilterOperator::NOT_EQUAL:
+ while ( ( pKey = GetNextKey() ) != nullptr )
+ if (m_pOperator->operate(pKey,m_pOperand))
+ break;
+ break;
+ case SQLFilterOperator::LESS:
+ case SQLFilterOperator::LESS_EQUAL:
+ case SQLFilterOperator::EQUAL:
+ pKey = GetNextKey();
+ if ( pKey == 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 )
+ if (m_pOperator->operate(pKey,m_pOperand))
+ break;
+ 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 = GetNextKey();
+ if ( pKey == 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: */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 20:33:20 +0000