X-Git-Url: http://git.polytechnique.org/?a=blobdiff_plain;f=classes%2Fplfilter.php;h=af8141d4e939f96857a1f32f0eb26b74955af1bb;hb=f23d33e1b114e9032b4b966baebdeb14b4215313;hp=7771fa4086f564f98f759cea045cb80eb0c561c7;hpb=067a59f4a5da39a1df635d67c4dab56b3f6d9478;p=platal.git

diff --git a/classes/plfilter.php b/classes/plfilter.php
index 7771fa4..af8141d 100644
--- a/classes/plfilter.php
+++ b/classes/plfilter.php
@@ -47,117 +47,19 @@ class PlLimit
 }
 // }}}
 
-// {{{ class PlSqlJoin
-class PlSqlJoin
-{
-    private $mode;
-    private $table;
-    private $condition;
-
-    const MODE_LEFT  = 'LEFT';
-    const MODE_RIGHT = 'RIGHT';
-    const MODE_INNER = 'INNER';
-
-    private function __construct($mode, $params)
-    {
-        $table = array_shift($params);
-        $condition = call_user_func_array(array('XDB', 'format'), $params);
-        if ($mode != self::MODE_LEFT && $mode != self::MODE_RIGHT && $mode != self::MODE_INNER) {
-            Platal::page()->kill("Join mode error: unknown mode $mode");
-            return;
-        }
-        $this->mode = $mode;
-        $this->table = $table;
-        $this->condition = $condition;
-    }
-
-    public function mode()
-    {
-        return $this->mode;
-    }
-
-    public function table()
-    {
-        return $this->table;
-    }
-
-    public function condition()
-    {
-        return $this->condition;
-    }
-
-    /** Replace all "metas" in the condition with their translation.
-     * $ME always becomes the alias of the table
-     * @param $key The name the joined table will have in the final query
-     * @param $joinMetas An array of meta => conversion to apply to the condition
-     */
-    public function replaceJoinMetas($key, $joinMetas = array())
-    {
-        $joinMetas['$ME'] = $key;
-        return str_replace(array_keys($joinMetas), $joinMetas, $this->condition);
-    }
-
-    /** Create a join command from an array of PlSqlJoin
-     * @param $joins The list of 'join' to convert into an SQL query
-     * @param $joinMetas An array of ('$META' => 'conversion') to apply to the joins.
-     */
-    public static function formatJoins(array $joins, array $joinMetas)
-    {
-        $str = '';
-        foreach ($joins as $key => $join) {
-            if (!($join instanceof PlSqlJoin)) {
-                Platal::page()->kill("Error: not a join: $join");
-            }
-            $mode  = $join->mode();
-            $table = $join->table();
-            $str .= ' ' . $mode . ' JOIN ' . $table . ' AS ' . $key;
-            if ($join->condition() != null) {
-                $str .= ' ON (' . $join->replaceJoinMetas($key, $joinMetas) . ')';
-            }
-            $str .= "\n";
-        }
-        return $str;
-    }
-
-    /** Build a left join
-     * @param table The name of the table.
-     * @param condition The condition of the jointure
-     */
-    public static function left()
-    {
-        $params = func_get_args();
-        return new PlSqlJoin(self::MODE_LEFT, $params);
-    }
-
-    /** Build a right join
-     * @param table The name of the table.
-     * @param condition The condition of the jointure
-     */
-    public static function right()
-    {
-        $params = func_get_args();
-        return new PlSqlJoin(self::MODE_RIGHT, $params);
-    }
-
-    /** Build a inner join
-     * @param table The name of the table.
-     * @param condition The condition of the jointure
-     */
-    public static function inner()
-    {
-        $params = func_get_args();
-        return new PlSqlJoin(self::MODE_INNER, $params);
-    }
-}
-// }}}
-
 // {{{ class PlFilterOrder
+/** Base class for ordering results of a query.
+ * Parameters for the ordering must be given to the constructor ($desc for a
+ *     descending order).
+ * The getSortTokens function is used to get actual ordering part of the query.
+ */
 abstract class PlFilterOrder
 {
     protected $desc = false;
     public function __construct($desc = false)
     {
         $this->desc = $desc;
+        $this->_tokens = null;
     }
 
     public function toggleDesc()
@@ -173,6 +75,7 @@ abstract class PlFilterOrder
     public function buildSort(PlFilter &$pf)
     {
         $sel = $this->getSortTokens($pf);
+        $this->_tokens = $sel;
         if (!is_array($sel)) {
             $sel = array($sel);
         }
@@ -184,10 +87,31 @@ abstract class PlFilterOrder
         return $sel;
     }
 
+    /** This function must return the tokens to use for ordering
+     * @param &$pf The PlFilter whose results must be ordered
+     * @return The name of the field to use for ordering results
+     */
     abstract protected function getSortTokens(PlFilter &$pf);
 }
 // }}}
 
+// {{{ class PlFilterGroupableOrder
+/** Extension of a PlFilterOrder, for orders where the value on which ordering
+ * is done could be used for grouping results (promo, country, ...)
+ */
+abstract class PlFilterGroupableOrder extends PlFilterOrder
+{
+    /** This function will be called when trying to retrieve groups;
+     * the returned token will be used to group the values.
+     * It will always be called AFTER getSortTokens().
+     */
+    public function getGroupToken(PlFilter &$pf)
+    {
+        return $this->_tokens;
+    }
+}
+// }}}
+
 // {{{ class PFO_Random
 class PFO_Random extends PlFilterOrder
 {
@@ -380,6 +304,16 @@ abstract class PlFilter
 
     public abstract function getTotalCount();
 
+    /** Whether this PlFilter can return grouped results through
+     * $this->getGroups();
+     */
+    public abstract function hasGroups();
+
+    /** Used to retrieve value/amount resulting from grouping by the first
+     * given order.
+     */
+    public abstract function getGroups();
+
     /** Get objects, selecting only those within a limit
      * @param $limit The portion of the matching objects to select
      */