/**
- * Collects search constraints that are independent of the
+ * Collection of search constraints that are independent of the
* actual interpretation of the search query.
*
* The search context is shared between all SearchDescriptions. This
*/
class SearchContext
{
+ /// Search radius around a given Near reference point.
private $fNearRadius = false;
+ /// True if search must be restricted to viewbox only.
public $bViewboxBounded = false;
+ /// Reference point for search (as SQL).
public $sqlNear = '';
+ /// Viewbox selected for search (as SQL).
public $sqlViewboxSmall = '';
+ /// Viewbox with a larger buffer around (as SQL).
public $sqlViewboxLarge = '';
+ /// Reference along a route (as SQL).
public $sqlViewboxCentre = '';
+ /// List of countries to restrict search to (as SQL).
public $sqlCountryList = '';
+ /// List of place IDs to exclude (as SQL).
private $sqlExcludeList = '';
+
+ /**
+ * Check if a reference point is defined.
+ *
+ * @return bool True if a reference point is defined.
+ */
public function hasNearPoint()
{
return $this->fNearRadius !== false;
}
+ /**
+ * Get radius around reference point.
+ *
+ * @return float Search radius around refernce point.
+ */
public function nearRadius()
{
return $this->fNearRadius;
}
+ /**
+ * Set search reference point in WGS84.
+ *
+ * If set, then only places around this point will be taken into account.
+ *
+ * @param float $fLat Latitude of point.
+ * @param float $fLon Longitude of point.
+ * @param float $fRadius Search radius around point.
+ *
+ * @return void
+ */
public function setNearPoint($fLat, $fLon, $fRadius = 0.1)
{
$this->fNearRadius = $fRadius;
$this->sqlNear = 'ST_SetSRID(ST_Point('.$fLon.','.$fLat.'),4326)';
}
+ /**
+ * Check if the search is geographically restricted.
+ *
+ * Searches are restricted if a reference point is given or if
+ * a bounded viewbox is set.
+ *
+ * @return bool True, if the search is geographically bounded.
+ */
public function isBoundedSearch()
{
return $this->hasNearPoint() || ($this->sqlViewboxSmall && $this->bViewboxBounded);
-
}
+ /**
+ * Set rectangular viewbox.
+ *
+ * The viewbox may be bounded which means that no search results
+ * must be outside the viewbox.
+ *
+ * @param float[4] $aViewBox Coordinates of the viewbox.
+ * @param bool $bBounded True if the viewbox is bounded.
+ *
+ * @return void
+ */
public function setViewboxFromBox(&$aViewBox, $bBounded)
{
$this->bViewboxBounded = $bBounded;
);
}
+ /**
+ * Set viewbox along a route.
+ *
+ * The viewbox may be bounded which means that no search results
+ * must be outside the viewbox.
+ *
+ * @param object $oDB DB connection to use for computing the box.
+ * @param string[] $aRoutePoints List of x,y coordinates along a route.
+ * @param float $fRouteWidth Buffer around the route to use.
+ * @param bool $bBounded True if the viewbox bounded.
+ *
+ * @return void
+ */
public function setViewboxFromRoute(&$oDB, $aRoutePoints, $fRouteWidth, $bBounded)
{
$this->bViewboxBounded = $bBounded;
$this->sqlViewboxLarge = "'".$sGeom."'::geometry";
}
+ /**
+ * Set list of excluded place IDs.
+ *
+ * @param integer[] $aExcluded List of IDs.
+ *
+ * @return void
+ */
public function setExcludeList($aExcluded)
{
$this->sqlExcludeList = ' not in ('.join(',', $aExcluded).')';
}
+ /**
+ * Set list of countries to restrict search to.
+ *
+ * @param string[] $aCountries List of two-letter lower-case country codes.
+ *
+ * @return void
+ */
public function setCountryList($aCountries)
{
$this->sqlCountryList = '('.join(',', array_map('addQuotes', $aCountries)).')';
}
/**
- * Extract a coordinate point from a query string.
+ * Extract a reference point from a query string.
*
* @param string $sQuery Query to scan.
*
- * @return The remaining query string.
+ * @return string The remaining query string.
*/
public function setNearPointFromQuery($sQuery)
{
return $sQuery;
}
+ /**
+ * Get an SQL snipped for computing the distance from the reference point.
+ *
+ * @param string $sObj SQL variable name to compute the distance from.
+ *
+ * @return string An SQL string.
+ */
public function distanceSQL($sObj)
{
return 'ST_Distance('.$this->sqlNear.", $sObj)";
}
+ /**
+ * Get an SQL snipped for checking if something is within range of the
+ * reference point.
+ *
+ * @param string $sObj SQL variable name to compute if it is within range.
+ *
+ * @return string An SQL string.
+ */
public function withinSQL($sObj)
{
return sprintf('ST_DWithin(%s, %s, %F)', $sObj, $this->sqlNear, $this->fNearRadius);
}
+ /**
+ * Get an SQL snipped of the importance factor of the viewbox.
+ *
+ * The importance factor is computed by checking if an object is within
+ * the viewbox and/or the extended version of the viewbox.
+ *
+ * @param string $sObj SQL variable name of object to weight the importance
+ *
+ * @return string SQL snipped of the factor with a leading multiply sign.
+ */
public function viewboxImportanceSQL($sObj)
{
$sSQL = '';
return $sSQL;
}
+ /**
+ * SQL snipped checking if a place ID should be excluded.
+ *
+ * @param string $sVariable SQL variable name of place ID to check,
+ * potentially prefixed with more SQL.
+ *
+ * @return string SQL snippet.
+ */
public function excludeSQL($sVariable)
{
if ($this->sqlExcludeList) {
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