174 lines
4.8 KiB
C++
174 lines
4.8 KiB
C++
/*
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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 compareDistType
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*/
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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 "Stream.h"
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#include "Algebras/Rectangle/RectangleAlgebra.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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Expect a stream of spatial objects and a boolean value.
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*/
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ListExpr drelcollect_boxTM( ListExpr args ) {
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std::string err = "stream(spatial) x bool expected ";
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if( !nl->HasLength( args, 2 ) ) {
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return listutils::typeError( err + " (wrong number of args)" );
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}
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if( !Stream<Attribute>::checkType( nl->First( args ) ) ) {
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return listutils::typeError( err +
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" ( first arg is not an attribute stream)" );
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}
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if( !CcBool::checkType( nl->Second( args ) ) ) {
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return listutils::typeError( err + " (second arg is not a bool)" );
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}
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ListExpr attr = nl->Second( nl->First( args ) );
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if( listutils::isKind( attr, Kind::SPATIAL2D( ) ) ) {
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return listutils::basicSymbol<Rectangle<2> >( );
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}
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if( listutils::isKind( attr, Kind::SPATIAL3D( ) ) ) {
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return listutils::basicSymbol<Rectangle<3> >( );
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}
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return listutils::typeError( err +
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" (attribute not in kind SPATIAL2D or SPATIAL3D)" );
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}
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/*
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1.2 Value Mapping
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Computes the bounding box from a stream of spatial attributes.
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*/
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template<int dim>
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int drelcollect_boxVMT( Word* args, Word& result, int message,
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Word& local, Supplier s ) {
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Stream<StandardSpatialAttribute<dim> > stream( args[ 0 ] );
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CcBool* ignoreUndefined = ( CcBool* )args[ 1 ].addr;
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result = qp->ResultStorage( s );
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Rectangle<dim>* res = ( Rectangle<dim>* ) result.addr;
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res->SetDefined( false );
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if( !ignoreUndefined->IsDefined( ) ) {
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return 0;
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}
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stream.open( );
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bool first = true;
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bool useundef = !ignoreUndefined->GetValue( );
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StandardSpatialAttribute<dim>* a = stream.request( );
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while( a ) {
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if( a->IsDefined( ) ) {
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Rectangle<dim> box = a->BoundingBox( );
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if( box.IsDefined( ) ) {
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if( first ) {
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res->SetDefined( true );
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( *res ) = box;
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first = false;
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} else {
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res->Extend( box );
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}
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}
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} else {
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if( !useundef ) {
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res->SetDefined( false );
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a->DeleteIfAllowed( );
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a = 0;
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stream.close( );
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return 0;
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}
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}
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a->DeleteIfAllowed( );
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a = stream.request( );
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}
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stream.close( );
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return 0;
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}
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/*
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1.3 ValueMapping Array of drfdistribute
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*/
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ValueMapping drelcollect_boxVM[ ] = {
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drelcollect_boxVMT<2>,
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drelcollect_boxVMT<3>
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};
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/*
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1.4 Selection function
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*/
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int drelcollect_boxSelect( ListExpr args ) {
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ListExpr attr = nl->Second( nl->First( args ) );
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return listutils::isKind( attr, Kind::SPATIAL2D( ) ) ? 0 : 1;
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}
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/*
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1.5 Specification of comparedisttype
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*/
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OperatorSpec drelcollect_boxSpec(
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"stream<SPATIAL> x bool -> rectangle",
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" _ drelcollect_box[_]",
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"Computes the bounding box from a stream of spatial attributes"
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"If the second parameter is set to be true, undefined elements "
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" within the stream are ignored. Otherwise an undefined element"
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" will lead to an undefined result.",
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"query strassen feed projecttransformstream[GeoData] collect_box[TRUE] "
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);
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/*
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1.6 Operator instance of comparedisttype operator
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*/
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Operator drelcollect_boxOp(
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"drelcollect_box",
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drelcollect_boxSpec.getStr( ),
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2,
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drelcollect_boxVM,
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drelcollect_boxSelect,
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drelcollect_boxTM
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);
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} // end of namespace drel
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