class.ilADTLocationSearchBridgeSingle.php

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<?php

require_once "Services/ADT/classes/Bridges/class.ilADTSearchBridgeSingle.php";

class ilADTLocationSearchBridgeSingle extends ilADTSearchBridgeSingle
{
        protected $radius; // [int]     
        
        protected function isValidADTDefinition(ilADTDefinition $a_adt_def)
        {
                return ($a_adt_def instanceof ilADTLocationDefinition);
        }
        
        
        // table2gui / filter
        
        public function loadFilter()
        {
                $value = $this->readFilter();
                if($value !== null)
                {
                        // :TODO:
                }
        }
        
        
        // form
        
        public function addToForm()
        {                       
                global $lng;
                
                $adt = $this->getADT();
                
                $default = false;
                if($adt->isNull())
                {
                        // see ilPersonalProfileGUI::addLocationToForm()
                        
                        // use installation default
                        include_once("./Services/Maps/classes/class.ilMapUtil.php");
                        $def = ilMapUtil::getDefaultSettings();
                        $adt->setLatitude($def["latitude"]);
                        $adt->setLongitude($def["longitude"]);
                        $adt->setZoom($def["zoom"]);
                        
                        $default = true;
                }
                
                $optional = new ilCheckboxInputGUI($this->getTitle(), $this->addToElementId("tgl"));
                
                if(!$default && !$adt->isNull())
                {
                        $optional->setChecked(true);
                }
                        
                $loc = new ilLocationInputGUI($lng->txt("location"), $this->getElementId());
                $loc->setLongitude($adt->getLongitude());
                $loc->setLatitude($adt->getLatitude());
                $loc->setZoom($adt->getZoom());                         
                $optional->addSubItem($loc);
                        
                $rad = new ilNumberInputGUI($lng->txt("form_location_radius"), $this->addToElementId("rad"));
                $rad->setSize(4);
                $rad->setSuffix($lng->txt("form_location_radius_km"));
                $rad->setValue($this->radius);
                $rad->setRequired(true);
                $optional->addSubItem($rad);
                                
                $this->addToParentElement($optional);
        }
        
        protected function shouldBeImportedFromPost($a_post)
        {
                return (bool)$a_post["tgl"];
        }
        
        public function importFromPost(array $a_post = null)
        {                               
                $post = $this->extractPostValues($a_post);
                                
                if($post && $this->shouldBeImportedFromPost($post))
                {               
                        $tgl = $this->getForm()->getItemByPostVar($this->addToElementId("tgl"));
                        $tgl->setChecked(true);
                        
                        $item = $this->getForm()->getItemByPostVar($this->getElementId());
                        $item->setLongitude($post["longitude"]);
                        $item->setLatitude($post["latitude"]);
                        $item->setZoom($post["zoom"]);  
                        
                        $this->radius = (int)$post["rad"];
                                                
                        $this->getADT()->setLongitude($post["longitude"]);
                        $this->getADT()->setLatitude($post["latitude"]);
                        $this->getADT()->setZoom($post["zoom"]);                
                }
                else
                {                       
                        // optional empty is valid
                        $this->force_valid = true;
                        
                        $this->getADT()->setLongitude(null);
                        $this->getADT()->setLatitude(null);
                        $this->getADT()->setZoom(null); 
                        $this->radius = null;
                }       
        }
                
        public function isValid()
        {
                return (parent::isValid() && ((int)$this->radius || (bool)$this->force_valid));         
        }
        
        
        // bounding
        
        protected function getBoundingBox($a_latitude, $a_longitude, $a_radius)
        {
                $earth_radius = 6371;
                
                // http://www.d-mueller.de/blog/umkreissuche-latlong-und-der-radius/
                $max_lat = $a_latitude + rad2deg($a_radius/$earth_radius);
                $min_lat = $a_latitude - rad2deg($a_radius/$earth_radius);
                $max_long = $a_longitude + rad2deg($a_radius/$earth_radius/cos(deg2rad($a_latitude)));
                $min_long = $a_longitude - rad2deg($a_radius/$earth_radius/cos(deg2rad($a_latitude)));

                return array(
                        "lat" => array("min"=>$min_lat, "max"=>$max_lat)
                        ,"long" => array("min"=>$min_long, "max"=>$max_long)
                );
        }

        
        // db
        
        public function getSQLCondition($a_element_id)
        {
                global $ilDB;
                
                if(!$this->isNull() && $this->isValid())
                {
                        $box = $this->getBoundingBox($this->getADT()->getLatitude(), $this->getADT()->getLongitude(), $this->radius);
                                                
                        $res = array();                 
                        $res[] = $a_element_id."_lat >= ".$ilDB->quote($box["lat"]["min"], "float");    
                        $res[] = $a_element_id."_lat <= ".$ilDB->quote($box["lat"]["max"], "float");    
                        $res[] = $a_element_id."_long >= ".$ilDB->quote($box["long"]["min"], "float");  
                        $res[] = $a_element_id."_long <= ".$ilDB->quote($box["long"]["max"], "float");  
                                
                        return "(".implode(" AND ", $res).")";
                }
        }
        
        
        //  import/export       
                
        public function getSerializedValue()
        {               
                if(!$this->isNull() && $this->isValid())                
                {                       
                        return serialize(array(
                                "lat" => $this->getADT()->getLatitude()
                                ,"long" => $this->getADT()->getLongitude()
                                ,"zoom" => $this->getADT()->getZoom()
                                ,"radius" => (int)$this->radius
                        ));
                }               
        }
        
        public function setSerializedValue($a_value)
        {               
                $a_value = unserialize($a_value);
                if(is_array($a_value))
                {
                        $this->getADT()->setLatitude($a_value["lat"]);                  
                        $this->getADT()->setLongitude($a_value["long"]);                        
                        $this->getADT()->setZoom($a_value["zoom"]);                     
                        $this->radius = (int)$a_value["radius"];                        
                }               
        }
        
}

?>