* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
***************************************************************************/
+__autoload('xdb');
+
+// {{{ class PlLimit
class PlLimit
{
private $count = null;
public function getSql()
{
- if (!is_null($this->count)) {
+ if (!is_null($this->count) && $this->count != 0) {
if (!is_null($this->from) && $this->from != 0) {
return XDB::format('LIMIT {?}, {?}', (int)$this->from, (int)$this->count);
} else {
return '';
}
}
+// }}}
-class PlSqlJoin
+// {{{ class PlFilterOrder
+/** Base class for ordering results of a query.
+ * Parameters for the ordering must be given to the constructor ($desc for a
+ * descending order).
+ * The getSortTokens function is used to get actual ordering part of the query.
+ */
+abstract class PlFilterOrder implements PlExportable
{
- private $mode;
- private $table;
- private $condition;
-
- const MODE_LEFT = 'LEFT';
- const MODE_RIGHT = 'RIGHT';
- const MODE_INNER = 'INNER';
+ protected $desc = false;
+ public function __construct($desc = false)
+ {
+ $this->desc = $desc;
+ $this->_tokens = null;
+ }
- public function __construct($mode, $table, $condition)
+ protected function buildExport($type)
{
- if ($mode != self::MODE_LEFT && $mode != self::MODE_RIGHT && $mode != self::MODE_INNER) {
- Platal::page()->kill("Join mode error : unknown mode $mode");
- return;
+ $export = array('type' => $type);
+ if ($this->desc) {
+ $export['order'] = 'desc';
}
- $this->mode = $mode;
- $this->table = $table;
- $this->condition = $condition;
+ return $export;
}
- public function mode()
+ public function export()
{
- return $this->mode;
+ throw new Exception("This instance is not exportable");
}
- public function table()
+ public function toggleDesc()
{
- return $this->table;
+ $this->desc = !$this->desc;
}
- public function condition()
+ public function setDescending($desc = true)
{
- return $this->condition;
+ $this->desc = $desc;
}
- /** 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())
+ public function buildSort(PlFilter $pf)
{
- $joinMetas['$ME'] = $key;
- return str_replace(array_keys($joinMetas), $joinMetas, $this->condition);
+ $sel = $this->getSortTokens($pf);
+ $this->_tokens = $sel;
+ if (!is_array($sel)) {
+ $sel = array($sel);
+ }
+ if ($this->desc) {
+ foreach ($sel as $k => $s) {
+ $sel[$k] = $s . ' DESC';
+ }
+ }
+ return $sel;
}
- /** 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.
+ /** 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
*/
- public static function formatJoins(array $joins, array $joinMetas)
+ 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
+{
+ private $seed = null;
+
+ public function __construct($seed = null, $desc = false)
+ {
+ parent::__construct($desc);
+ $this->seed = $seed;
+ }
+
+ protected function getSortTokens(PlFilter $pf)
{
- $str = '';
- foreach ($joins as $key => $join) {
- if (! ($join instanceof PlSqlJoin)) {
- Platal::page()->kill("Error: not a join: $join");
+ if ($this->seed == null) {
+ return 'RAND()';
+ } else {
+ return XDB::format('RAND({?})', $this->seed);
+ }
+ }
+
+ public function export()
+ {
+ $export = array('type' => 'random',);
+ if ($this->seed !== null)
+ $export['seed'] = $this->seed;
+ return $export;
+ }
+}
+// }}}
+
+// {{{ interface PlFilterCondition
+interface PlFilterCondition extends PlExportable
+{
+ const COND_TRUE = 'TRUE';
+ const COND_FALSE = 'FALSE';
+
+ public function buildCondition(PlFilter $pf);
+}
+// }}}
+
+// {{{ class PFC_OneChild
+abstract class PFC_OneChild implements PlFilterCondition
+{
+ protected $child;
+
+ public function __construct($child = null)
+ {
+ if (!is_null($child) && ($child instanceof PlFilterCondition)) {
+ $this->setChild($child);
+ }
+ }
+
+ public function setChild(PlFilterCondition $cond)
+ {
+ $this->child = $cond;
+ }
+
+ public function export()
+ {
+ return array('child' => $child->export());
+ }
+}
+// }}}
+
+// {{{ class PFC_NChildren
+abstract class PFC_NChildren implements PlFilterCondition
+{
+ protected $children = array();
+
+ public function __construct()
+ {
+ $this->addChildren(pl_flatten(func_get_args()));
+ }
+
+ public function addChildren(array $conds)
+ {
+ foreach ($conds as $cond) {
+ if (!is_null($cond) && ($cond instanceof PlFilterCondition)) {
+ $this->addChild($cond);
}
- $mode = $join->mode();
- $table = $join->table();
- $str .= ' ' . $mode . ' JOIN ' . $table . ' AS ' . $key;
- if ($join->condition() != null) {
- $str .= ' ON (' . $join->replaceJoinMetas($key, $joinMetas) . ')';
+ }
+ }
+
+ public function addChild(PlFilterCondition $cond)
+ {
+ $this->children[] = $cond;
+ }
+
+ protected function catConds(array $cond, $op, $fallback)
+ {
+ if (count($cond) == 0) {
+ return $fallback;
+ } else if (count($cond) == 1) {
+ return $cond[0];
+ } else {
+ return '(' . implode(') ' . $op . ' (', $cond) . ')';
+ }
+ }
+
+ public function export()
+ {
+ $export = array();
+ foreach ($this->children as $child) {
+ $export[] = $child->export();
+ }
+ return array('children' => $export);
+ }
+}
+// }}}
+
+// {{{ class PFC_True
+class PFC_True implements PlFilterCondition
+{
+ public function buildCondition(PlFilter $uf)
+ {
+ return self::COND_TRUE;
+ }
+
+ public function export()
+ {
+ return array('type' => 'true');
+ }
+}
+// }}}
+
+// {{{ class PFC_False
+class PFC_False implements PlFilterCondition
+{
+ public function buildCondition(PlFilter $uf)
+ {
+ return self::COND_FALSE;
+ }
+
+ public function export()
+ {
+ return array('type' => 'false');
+ }
+}
+// }}}
+
+// {{{ class PFC_Not
+class PFC_Not extends PFC_OneChild
+{
+ public function buildCondition(PlFilter $uf)
+ {
+ $val = $this->child->buildCondition($uf);
+ if ($val == self::COND_TRUE) {
+ return self::COND_FALSE;
+ } else if ($val == self::COND_FALSE) {
+ return self::COND_TRUE;
+ } else {
+ return 'NOT (' . $val . ')';
+ }
+ }
+
+ public function export()
+ {
+ $export = parent::export();
+ $export['type'] = 'not';
+ return $export;
+ }
+}
+// }}}
+
+// {{{ class PFC_And
+class PFC_And extends PFC_NChildren
+{
+ public function buildCondition(PlFilter $uf)
+ {
+ if (empty($this->children)) {
+ return self::COND_FALSE;
+ } else {
+ $true = self::COND_FALSE;
+ $conds = array();
+ foreach ($this->children as $child) {
+ $val = $child->buildCondition($uf);
+ if ($val == self::COND_TRUE) {
+ $true = self::COND_TRUE;
+ } else if ($val == self::COND_FALSE) {
+ return self::COND_FALSE;
+ } else {
+ $conds[] = $val;
+ }
}
- $str .= "\n";
+ return $this->catConds($conds, 'AND', $true);
}
- return $str;
+ }
+
+ public function export() {
+ $export = parent::export();
+ $export['type'] = 'and';
+ return $export;
}
}
+// }}}
-abstract class PlFilter
+// {{{ class PFC_Or
+class PFC_Or extends PFC_NChildren
+{
+ public function buildCondition(PlFilter $uf)
+ {
+ if (empty($this->children)) {
+ return self::COND_TRUE;
+ } else {
+ $true = self::COND_TRUE;
+ $conds = array();
+ foreach ($this->children as $child) {
+ $val = $child->buildCondition($uf);
+ if ($val == self::COND_TRUE) {
+ return self::COND_TRUE;
+ } else if ($val == self::COND_FALSE) {
+ $true = self::COND_FALSE;
+ } else {
+ $conds[] = $val;
+ }
+ }
+ return $this->catConds($conds, 'OR', $true);
+ }
+ }
+
+ public function export() {
+ $export = parent::export();
+ $export['type'] = 'or';
+ return $export;
+ }
+}
+// }}}
+
+// {{{ class PlFilter
+abstract class PlFilter implements PlExportable
{
/** Filters objects matching the PlFilter
* @param $objects The objects to filter
* @param $limit The portion of the matching objects to show
*/
- public abstract function filter(array $objects, PlLimit &$limit);
+ public abstract function filter(array $objects, $limit = null);
- public abstract function setCondition(PlFilterCondition &$cond);
+ public abstract function setCondition(PlFilterCondition $cond);
- public abstract function addSort(PlFilterOrder &$sort);
+ public abstract function addSort(PlFilterOrder $sort);
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 $limit The portion of the matching objects to select
*/
- public abstract function get(PlLimit &$limit);
+ public abstract function get($limit = null);
/** PRIVATE FUNCTIONS
*/
*
* "$ME" => "joined table alias" is always added to these.
*/
- private $joinMetas = array();
+ protected $joinMetas = array();
+
+ protected $joinMethods = array();
/** Build the 'join' part of the query
* This function will call all methods declared in self::$joinMethods
* to get an array of PlSqlJoin objects to merge
*/
- private function buildJoins()
+ protected function buildJoins()
{
$joins = array();
- foreach ($this->$joinMethods as $method) {
+ foreach ($this->joinMethods as $method) {
$joins = array_merge($joins, $this->$method());
}
- return PlSqlJoin::formatJoins($joins, $this->$joinMetas);
+ return PlSqlJoin::formatJoins($joins, $this->joinMetas);
}
}
+// }}}
+// vim:set et sw=4 sts=4 sws=4 foldmethod=marker enc=utf-8:
?>
projects / platal.git / blobdiff