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[nominatim.git] / lib / SearchContext.php

diff --git a/lib/SearchContext.php b/lib/SearchContext.php
index f5eab95ac5d8d7dd4e5d8ce59903f0a6c240d67d..8316a01288c58673332640d72e35ef3bbb506ddf 100644 (file)
--- a/lib/SearchContext.php
+++ b/lib/SearchContext.php
@@ -2,11 +2,11 @@
 
 namespace Nominatim;
 
 
 namespace Nominatim;
 

-require_once(CONST_BasePath.'/lib/lib.php');
+require_once(CONST_LibDir.'/lib.php');

 
 
 /**
 
 
 /**

- * 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
  * actual interpretation of the search query.
  *
  * The search context is shared between all SearchDescriptions. This


@@ -15,38 +15,97 @@ require_once(CONST_BasePath.'/lib/lib.php');
  */
 class SearchContext
 {
  */
 class SearchContext
 {

+    /// Search radius around a given Near reference point.

     private $fNearRadius = false;
     private $fNearRadius = false;

+    /// True if search must be restricted to viewbox only.

     public $bViewboxBounded = false;
 
     public $bViewboxBounded = false;
 

+    /// Reference point for search (as SQL).

     public $sqlNear = '';
     public $sqlNear = '';

+    /// Viewbox selected for search (as SQL).

     public $sqlViewboxSmall = '';
     public $sqlViewboxSmall = '';

+    /// Viewbox with a larger buffer around (as SQL).

     public $sqlViewboxLarge = '';
     public $sqlViewboxLarge = '';

+    /// Reference along a route (as SQL).

     public $sqlViewboxCentre = '';
     public $sqlViewboxCentre = '';

+    /// List of countries to restrict search to (as SQL).

     public $sqlCountryList = '';
     public $sqlCountryList = '';

+    /// List of place IDs to exclude (as SQL).

     private $sqlExcludeList = '';
     private $sqlExcludeList = '';

+    /// Subset of word ids of full words in the query.
+    private $aFullNameWords = array();

 
 

+    public function setFullNameWords($aWordList)
+    {
+        $this->aFullNameWords = $aWordList;
+    }
+
+    public function getFullNameTerms()
+    {
+        return $this->aFullNameWords;
+    }
+
+    /**
+     * Check if a reference point is defined.
+     *
+     * @return bool True if a reference point is defined.
+     */

     public function hasNearPoint()
     {
         return $this->fNearRadius !== false;
     }
 
     public function hasNearPoint()
     {
         return $this->fNearRadius !== false;
     }
 

+    /**
+     * Get radius around reference point.
+     *
+     * @return float Search radius around reference point.
+     */

     public function nearRadius()
     {
         return $this->fNearRadius;
     }
 
     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)';
     }
 
     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);
     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 = $bBounded;
     public function setViewboxFromBox(&$aViewBox, $bBounded)
     {
         $this->bViewboxBounded = $bBounded;


@@ -60,8 +119,8 @@ class SearchContext
             $aViewBox[3]
         );
 
             $aViewBox[3]
         );
 

-        $fHeight = $aViewBox[0] - $aViewBox[2];
-        $fWidth = $aViewBox[1] - $aViewBox[3];
+        $fHeight = abs($aViewBox[0] - $aViewBox[2]);
+        $fWidth = abs($aViewBox[1] - $aViewBox[3]);

 
         $this->sqlViewboxLarge = sprintf(
             'ST_SetSRID(ST_MakeBox2D(ST_Point(%F,%F),ST_Point(%F,%F)),4326)',
 
         $this->sqlViewboxLarge = sprintf(
             'ST_SetSRID(ST_MakeBox2D(ST_Point(%F,%F),ST_Point(%F,%F)),4326)',


@@ -72,6 +131,19 @@ class SearchContext
         );
     }
 
         );
     }
 

+    /**
+     * Set viewbox along a route.
+     *
+     * The viewbox may be bounded which means that no search results
+     * must be outside the viewbox.
+     *
+     * @param object   $oDB          Nominatim::DB instance 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 = $bBounded;
     public function setViewboxFromRoute(&$oDB, $aRoutePoints, $fRouteWidth, $bBounded)
     {
         $this->bViewboxBounded = $bBounded;


@@ -85,30 +157,44 @@ class SearchContext
         $this->sqlViewboxCentre .= ")'::geometry,4326)";
 
         $sSQL = 'ST_BUFFER('.$this->sqlViewboxCentre.','.($fRouteWidth/69).')';
         $this->sqlViewboxCentre .= ")'::geometry,4326)";
 
         $sSQL = 'ST_BUFFER('.$this->sqlViewboxCentre.','.($fRouteWidth/69).')';

-        $sGeom = chksql($oDB->getOne("select ".$sSQL), "Could not get small viewbox");
+        $sGeom = $oDB->getOne('select '.$sSQL, null, 'Could not get small viewbox');

         $this->sqlViewboxSmall = "'".$sGeom."'::geometry";
 
         $sSQL = 'ST_BUFFER('.$this->sqlViewboxCentre.','.($fRouteWidth/30).')';
         $this->sqlViewboxSmall = "'".$sGeom."'::geometry";
 
         $sSQL = 'ST_BUFFER('.$this->sqlViewboxCentre.','.($fRouteWidth/30).')';

-        $sGeom = chksql($oDB->getOne("select ".$sSQL), "Could not get large viewbox");
+        $sGeom = $oDB->getOne('select '.$sSQL, null, 'Could not get large viewbox');

         $this->sqlViewboxLarge = "'".$sGeom."'::geometry";
     }
 
         $this->sqlViewboxLarge = "'".$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).')';
     }
 
     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)).')';
     }
 
     /**
     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.
      *
      *
      * @param string $sQuery Query to scan.
      *

-     * @return The remaining query string.
+     * @return string The remaining query string.

      */
     public function setNearPointFromQuery($sQuery)
     {
      */
     public function setNearPointFromQuery($sQuery)
     {


@@ -127,16 +213,41 @@ class SearchContext
         return $sQuery;
     }
 
         return $sQuery;
     }
 

+    /**
+     * Get an SQL snippet 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)";
     }
 
     public function distanceSQL($sObj)
     {
         return 'ST_Distance('.$this->sqlNear.", $sObj)";
     }
 

+    /**
+     * Get an SQL snippet 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);
     }
 
     public function withinSQL($sObj)
     {
         return sprintf('ST_DWithin(%s, %s, %F)', $sObj, $this->sqlNear, $this->fNearRadius);
     }
 

+    /**
+     * Get an SQL snippet 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 snippet of the factor with a leading multiply sign.
+     */

     public function viewboxImportanceSQL($sObj)
     {
         $sSQL = '';
     public function viewboxImportanceSQL($sObj)
     {
         $sSQL = '';


@@ -151,6 +262,14 @@ class SearchContext
         return $sSQL;
     }
 
         return $sSQL;
     }
 

+    /**
+     * SQL snippet 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) {
     public function excludeSQL($sVariable)
     {
         if ($this->sqlExcludeList) {


@@ -159,4 +278,18 @@ class SearchContext
 
         return '';
     }
 
         return '';
     }

+
+    public function debugInfo()
+    {
+        return array(
+                'Near radius' => $this->fNearRadius,
+                'Near point (SQL)' => $this->sqlNear,
+                'Bounded viewbox' => $this->bViewboxBounded,
+                'Viewbox (SQL, small)' => $this->sqlViewboxSmall,
+                'Viewbox (SQL, large)' => $this->sqlViewboxLarge,
+                'Viewbox (SQL, centre)' => $this->sqlViewboxCentre,
+                'Countries (SQL)' => $this->sqlCountryList,
+                'Excluded IDs (SQL)' => $this->sqlExcludeList
+               );
+    }

 }
 }