140 lines
3.2 KiB
C++
140 lines
3.2 KiB
C++
/*
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----
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This file is part of SECONDO.
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Copyright (C) 2004, University in Hagen, Department of Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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*/
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#include "ToTuples.h"
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#include <cstdint>
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#include "ListUtils.h"
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#include "LogMsg.h"
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#include "OperatorUtils.h"
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#include "QueryProcessor.h"
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#include "SecondoSystem.h"
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#include "StreamValueMapping.h"
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#include <string>
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#include "Symbols.h"
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#include "../TBlock.h"
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#include "../TypeConstructors/TBlockTC.h"
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#include "TypeUtils.h"
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using namespace CRelAlgebra;
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using namespace CRelAlgebra::Operators;
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using listutils::isStream;
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using std::string;
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extern NestedList *nl;
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extern QueryProcessor *qp;
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ToTuples::ToTuples() :
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Operator(info, StreamValueMapping<State>, TypeMapping)
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{
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}
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const OperatorInfo ToTuples::info = OperatorInfo(
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"totuples", "stream(tblock) -> stream(tuple)",
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"_ totuples",
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"Transforms a stream of tuple blocks into one of tuples.",
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"");
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ListExpr ToTuples::TypeMapping(ListExpr args)
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{
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//Expect one parameter
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if (!nl->HasLength(args, 1))
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{
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return GetTypeError("Expected one argument.");
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}
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//Check first parameter for stream
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ListExpr stream = nl->First(args);
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if (!isStream(stream))
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{
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return GetTypeError(0, "Isn't a stream.");
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}
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const ListExpr tblockType = GetStreamType(stream);
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//Check first parameter's stream type for 'tblock'
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if (!TBlockTI::Check(tblockType))
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{
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return GetTypeError(0, "Isn't a stream of tblock.");
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}
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//Result is a stream of 'tuple'
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return TBlockTI(tblockType, false).GetTupleTypeExpr(true);
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}
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ToTuples::State::State(ArgVector args, Supplier s) :
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m_stream(args[0]),
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m_block(nullptr),
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m_tupleType(new TupleType(
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SecondoSystem::GetCatalog()->NumericType(nl->Second(qp->GetType(s)))))
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{
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m_stream.open();
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}
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ToTuples::State::~State()
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{
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m_tupleType->DeleteIfAllowed();
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if (m_block != nullptr)
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{
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m_block->DecRef();
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}
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}
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Tuple *ToTuples::State::Request()
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{
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if (!m_blockIterator.IsValid() || !m_blockIterator.MoveToNext())
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{
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do
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{
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if (m_block != nullptr)
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{
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m_block->DecRef();
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}
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if ((m_block = m_stream.request()) == nullptr)
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{
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return nullptr;
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}
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}
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while (!(m_blockIterator = m_block->GetFilteredIterator()).IsValid());
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}
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const TBlockEntry &blockTuple = m_blockIterator.Get();
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Tuple *tuple = new Tuple(m_tupleType);
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const uint64_t columnCount = m_block->GetColumnCount();
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for (uint64_t i = 0; i < columnCount; ++i)
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{
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Attribute *attribute = blockTuple[i].GetAttribute(true);
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tuple->PutAttribute(i, attribute);
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}
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return tuple;
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}
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