115 lines
3.0 KiB
C++
115 lines
3.0 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 "FeedProject.h"
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#include "../TypeConstructors/CRelTC.h"
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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 "Project.h"
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#include "QueryProcessor.h"
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#include "StandardTypes.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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using namespace CRelAlgebra;
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using namespace CRelAlgebra::Operators;
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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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//FeedProject-------------------------------------------------------------------
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FeedProject::FeedProject() :
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Operator(info, StreamValueMapping<State>, TypeMapping)
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{
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}
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const OperatorInfo FeedProject::info = OperatorInfo(
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"feedproject", "crel x symbol x symbol* -> stream tblock",
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"_ feedproject[ list ]",
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"Produces a stream of tuple blocks from a relation projected on the columns "
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"determined by the provided names.",
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"query people feedproject[Name, Age] consume");
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ListExpr FeedProject::TypeMapping(ListExpr args)
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{
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if (!nl->HasLength(args, 2))
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{
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return GetTypeError("Expected two arguments.");
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}
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const ListExpr crelType = nl->First(args);
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if (!CRelTI::Check(crelType))
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{
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return GetTypeError(0, "relation", "Not a crel.");
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}
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const Project::Info info(CRelTI(crelType, false), nl->Second(args));
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if (info.HasError())
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{
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return GetTypeError(1, "column names", info.GetError());
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}
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return nl->ThreeElemList(nl->SymbolAtom(Symbols::APPEND()),
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info.GetIndicesExpr(),
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info.GetBlockTypeInfo().GetTypeExpr(true));
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}
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//FeedProject::State------------------------------------------------------------
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FeedProject::State::State(ArgVector args, Supplier s) :
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m_blockIterator(((CRel*)args[0].addr)->GetBlockIterator())
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{
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qp->DeleteResultStorage(s);
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const uint64_t indexCount = ((CcInt*)args[2].addr)->GetValue();
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for (uint64_t i = 0; i < indexCount; ++i)
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{
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m_indices.push_back(((CcInt*)args[i + 3].addr)->GetValue());
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}
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}
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TBlock *FeedProject::State::Request()
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{
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if (m_blockIterator.IsValid())
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{
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TBlock *block = new TBlock(m_blockIterator.Get(), &m_indices.front(),
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m_indices.size());
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m_blockIterator.MoveToNext();
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return block;
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}
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return nullptr;
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}
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