208 lines
5.2 KiB
C++
208 lines
5.2 KiB
C++
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/*
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----
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This file is part of SECONDO.
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Copyright (C) 2015,
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Faculty of Mathematics and 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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1 Implementation of the secondo operator drel2darray
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*/
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#include "DRel.h"
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#include "NestedList.h"
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#include "ListUtils.h"
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#include "QueryProcessor.h"
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#include "StandardTypes.h"
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#include "DRelHelpers.h"
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extern NestedList* nl;
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extern QueryProcessor* qp;
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namespace drel {
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/*
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1.1 Type Mapping
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Get a d[f]rel or a d[f]arry as argument.
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*/
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ListExpr drel2darrayTM( ListExpr args ) {
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std::string err = "d[f]rel or d[f]array expected";
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if( !nl->HasLength( args, 1 ) ) {
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return listutils::typeError( err +
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": one arguments is expected" );
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}
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ListExpr result;
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if( DFRel::checkType( nl->First( args ) ) ) {
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result = nl->TwoElemList(
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listutils::basicSymbol<distributed2::DFArray>( ),
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nl->Second( nl->First( args ) ) );
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}
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else if( DRel::checkType( nl->First( args ) ) ) {
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result = nl->TwoElemList(
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listutils::basicSymbol<distributed2::DArray>( ),
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nl->Second( nl->First( args ) ) );
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}
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else if( distributed2::DFArray::checkType( nl->First( args ) ) ) {
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if(!Relation::checkType( nl->Second( nl->First( args ) ) ) ) {
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return listutils::typeError( err +
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": first argument is not a d[f]array with a relation" );
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}
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result = nl->ThreeElemList(
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listutils::basicSymbol<DFRel>( ),
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nl->Second( nl->First( args ) ),
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nl->OneElemList( nl->IntAtom( random ) ) );
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}
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else if( distributed2::DArray::checkType( nl->First( args ) ) ) {
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if(!Relation::checkType( nl->Second( nl->First( args ) ) ) ) {
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return listutils::typeError( err +
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": first argument is not a d[f]array with a relation" );
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}
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result = nl->ThreeElemList(
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listutils::basicSymbol<DRel>( ),
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nl->Second( nl->First( args ) ),
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nl->OneElemList( nl->IntAtom( random ) ) );
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}
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else {
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return listutils::typeError( err +
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": first argument is not a d[f]rel or a d[f]array" );
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}
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return result;
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}
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/*
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1.2 Value Mapping
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Creates a d[f]array.
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*/
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template<class T, class R>
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int drel2darrayVMT( Word* args, Word& result, int message,
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Word& local, Supplier s ) {
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result = qp->ResultStorage( s );
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T* input = ( T* )args[ 0 ].addr;
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R* res = ( R* ) result.addr;
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res->copyFrom( *input );
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res->setKeepRemoteObjects( true );
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return 0;
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}
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/*
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1.3 Value Mapping
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Creates a d[f]rel.
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*/
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template<class T, class R>
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int darray2drelVMT( Word* args, Word& result, int message,
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Word& local, Supplier s ) {
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result = qp->ResultStorage( s );
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T* input = ( T* )args[ 0 ].addr;
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R* res = ( R* ) result.addr;
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res->copyFrom( *input );
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res->setKeepRemoteObjects( true );
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if( res->IsDefined( ) ) {
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DistTypeBasic* distType = new DistTypeBasic( random );
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res->setDistType( distType );
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}
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return 0;
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}
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/*
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1.4 ValueMapping Array of drel2darray
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*/
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ValueMapping drel2darrayVM[ ] = {
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drel2darrayVMT<DRel, distributed2::DArray>,
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drel2darrayVMT<DFRel, distributed2::DFArray>,
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darray2drelVMT<distributed2::DArray, DRel>,
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darray2drelVMT<distributed2::DFArray, DFRel>
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};
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/*
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1.5 Selection function
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*/
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int drel2darraySelect( ListExpr args ) {
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std::string type = nl->SymbolValue( nl->First( nl->First( args ) ) );
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if( type == DRel::BasicType( ) ) {
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return 0;
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}
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else if( type == DFRel::BasicType( ) ) {
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return 1;
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}
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else if( type == distributed2::DArray::BasicType( ) ) {
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return 2;
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}
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else {
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return 3;
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}
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}
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/*
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1.6 Specification of drel2darray
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*/
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OperatorSpec drel2darraySpec(
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"d[f]rel(X) or d[f]array "
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"-> d[f]rel(X) or d[f]array ",
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" _ drel2darray",
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"Convert a d[f]rel to a d[f]array or a dfrel to a dfarray. ",
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" query drel1 drel2darray"
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);
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/*
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1.7 Operator instance of drel2darray operator
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*/
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Operator drel2darrayOp(
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"drel2darray",
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drel2darraySpec.getStr( ),
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4,
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drel2darrayVM,
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drel2darraySelect,
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drel2darrayTM
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);
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} // end of namespace drel
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