SemanticMaps/includes/SM_GeoCoordsValueDescription.php

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<?php

class SMGeoCoordsValueDescription extends SMWValueDescription {
        
        public function __construct( SMWDataItem $dataItem, $comparator ) {
                parent::__construct( $dataItem, $comparator );  
        }

        public function getQueryString( $asValue = false ) {
                if ( $this->m_dataItem !== null ) {
                        $queryString = SMWDataValueFactory::newDataItemValue( $this->m_dataItem, $this->m_property )->getWikiValue();
                        return $asValue ? $queryString : "[[$queryString]]";
                } else {
                        return $asValue ? '+' : '';
                }
        }
        
        public function getSQLCondition( $tableName, array $fieldNames, $dbs ) {
                $dataItem = $this->getDataItem();
                
                // Only execute the query when the description's type is geographical coordinates,
                // the description is valid, and the near comparator is used.
                if ( $dataItem->getDIType() != SMWDataItem::TYPE_GEO ) return false;

                $comparator = false;
                
                switch ( $this->getComparator() ) {
                        case SMW_CMP_EQ: $comparator = '='; break;
                        case SMW_CMP_LEQ: $comparator = '<='; break;
                        case SMW_CMP_GEQ: $comparator = '>='; break;
                        case SMW_CMP_NEQ: $comparator = '!='; break;
                }
                
                if ( $comparator ) {
                        $lat = $dbs->addQuotes( $dataItem->getLatitude() );
                        $lon = $dbs->addQuotes( $dataItem->getLongitude() );
                        
                        $conditions = array();
                                
            $conditions[] = "{$tableName}.$fieldNames[0] $comparator $lat";
            $conditions[] = "{$tableName}.$fieldNames[1] $comparator $lon";
                        
                        return implode( ' && ', $conditions );                  
                }
                else {
                        return false;
                }
        }
        
}

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