implements RenderStrategy logic

12 files changed, 300 insertions, 318 deletions

diff --git a/codebase/base_connector.php b/codebase/base_connector.php
index 451c61d..69f538e 100644
--- a/codebase/base_connector.php
+++ b/codebase/base_connector.php
@@ -6,6 +6,7 @@
 require_once("tools.php");
 require_once("db_common.php");
 require_once("dataprocessor.php");
+require_once("strategy.php");
 require_once("update.php");
 
 //enable buffering to catch and ignore any custom output before XML generation
@@ -290,18 +291,20 @@ class Connector {
 		@param data_type
 			name of class which will be used for dataprocessor calls handling, optional, DataProcessor class will be used by default. 
 	*/	
-	public function __construct($db,$type=false, $item_type=false, $data_type=false){
+	public function __construct($db,$type=false, $item_type=false, $data_type=false, $render_type = false){
 		$this->exec_time=microtime(true);
 
 		if (!$type) $type="MySQL";
 		if (class_exists($type."DBDataWrapper",false)) $type.="DBDataWrapper";
 		if (!$item_type) $item_type="DataItem";
 		if (!$data_type) $data_type="DataProcessor";
+		if (!$render_type) $render_type="RenderStrategy";
 		
 		$this->names=array(
 			"db_class"=>$type,
 			"item_class"=>$item_type,
 			"data_class"=>$data_type,
+			"render_class"=>$render_type
 		);
 		
 		$this->config = new DataConfig();
@@ -312,6 +315,7 @@ class Connector {
 		if (!class_exists($this->names["db_class"],false))
 			throw new Exception("DB class not found: ".$this->names["db_class"]);
 		$this->sql = new $this->names["db_class"]($db,$this->config);
+		$this->render = new $this->names["render_class"]();
 		
 		$this->db=$db;//saved for options connectors, if any
 		
@@ -332,7 +336,7 @@ class Connector {
 	}
 	
 	public function get_request(){
-		return new DataRequestConfig($this->config);
+		return new DataRequestConfig($this->request);
 	}
 
 
@@ -551,18 +555,7 @@ class Connector {
 		process commands, output requested data as XML
 	*/
 	protected function render_set($res){
-		$output="";
-		$index=0;
-		$this->event->trigger("beforeRenderSet",$this,$res,$this->config);
-		while ($data=$this->sql->get_next($res)){
-			$data = new $this->names["item_class"]($data,$this->config,$index);
-			if ($data->get_id()===false)
-				$data->set_id($this->uuid());
-			$this->event->trigger("beforeRender",$data);
-			$output.=$data->to_xml().$this->data_separator;
-			$index++;
-		}
-		return $output;
+		return $this->render->render_set($res, $this, $this->names["item_class"], $this->dload, $this->data_separator);
 	}
 	
 	/*! output fetched data as XML
diff --git a/codebase/data_connector.php b/codebase/data_connector.php
index 6f376a4..5b11cfa 100644
--- a/codebase/data_connector.php
+++ b/codebase/data_connector.php
@@ -87,10 +87,11 @@ class DataConnector extends Connector{
 		@param data_type
 			name of class which will be used for dataprocessor calls handling, optional, DataProcessor class will be used by default. 
 	*/	
-	public function __construct($res,$type=false,$item_type=false,$data_type=false){
+	public function __construct($res,$type=false,$item_type=false,$data_type=false,$render_type=false){
 		if (!$item_type) $item_type="CommonDataItem";
 		if (!$data_type) $data_type="CommonDataProcessor";
-		parent::__construct($res,$type,$item_type,$data_type);
+		if (!$render_type) $render_type="RenderStrategy";
+		parent::__construct($res,$type,$item_type,$data_type,$render_type);
 	}
 
 	protected function parse_request_mode(){
@@ -299,10 +300,11 @@ class TreeCommonDataItem extends CommonDataItem{
 
 class TreeDataConnector extends DataConnector{
 	protected $id_swap = array();
-	public function __construct($res,$type=false,$item_type=false,$data_type=false){
+	public function __construct($res,$type=false,$item_type=false,$data_type=false,$render_type=false){
 		if (!$item_type) $item_type="TreeCommonDataItem";
 		if (!$data_type) $data_type="CommonDataProcessor";
-		parent::__construct($res,$type,$item_type,$data_type);
+		if (!$render_type) $render_type="TreeRenderStrategy";
+		parent::__construct($res,$type,$item_type,$data_type,$render_type);
 
 		$this->event->attach("afterInsert",array($this,"parent_id_correction_a"));
 		$this->event->attach("beforeProcessing",array($this,"parent_id_correction_b"));
@@ -341,73 +343,25 @@ class TreeDataConnector extends DataConnector{
 			$this->request->set_relation("0");
 	}
 
-	protected function render_set($res){
-		$output="";
-		$index=0;
-		while ($data=$this->sql->get_next($res)){
-			$data = new $this->names["item_class"]($data,$this->config,$index);
-			$this->event->trigger("beforeRender",$data);
-		//there is no info about child elements, 
-		//if we are using dyn. loading - assume that it has,
-		//in normal mode just exec sub-render routine			
-			if ($data->has_kids()===-1 && $this->dload)
-					$data->set_kids(true);
-			$output.=$data->to_xml_start();
-			if ($data->has_kids()===-1 || ( $data->has_kids()==true && !$this->dload)){
-				$sub_request = new DataRequestConfig($this->request);
-				$sub_request->set_relation($data->get_id());
-				$output.=$this->render_set($this->sql->select($sub_request));
-			}
-			$output.=$data->to_xml_end();
-			$index++;
-		}
-		return $output;
-	}
-
 }
 
 
 class JSONTreeDataConnector extends TreeDataConnector{
 
-	public function __construct($res,$type=false,$item_type=false,$data_type=false){
+	public function __construct($res,$type=false,$item_type=false,$data_type=false,$render_type){
 		if (!$item_type) $item_type="JSONTreeCommonDataItem";
 		if (!$data_type) $data_type="CommonDataProcessor";
-		parent::__construct($res,$type,$item_type,$data_type);
+		if (!$render_type) $render_type="JSONTreeRenderStrategy";
+		parent::__construct($res,$type,$item_type,$data_type,$render_type);
 
 		$this->event->attach("afterInsert",array($this,"parent_id_correction_a"));
 		$this->event->attach("beforeProcessing",array($this,"parent_id_correction_b"));
 	}
 
-	protected function render_set($res){
-		$output=array();
-		$index=0;
-		while ($data=$this->sql->get_next($res)){
-			$data = new $this->names["item_class"]($data,$this->config,$index);
-			$this->event->trigger("beforeRender",$data);
-		//there is no info about child elements, 
-		//if we are using dyn. loading - assume that it has,
-		//in normal mode just exec sub-render routine			
-			if ($data->has_kids()===-1 && $this->dload)
-					$data->set_kids(true);
-			$record = &$data->to_xml_start();
-			if ($data->has_kids()===-1 || ( $data->has_kids()==true && !$this->dload)){
-				$sub_request = new DataRequestConfig($this->request);
-				$sub_request->set_relation($data->get_id());
-				$temp = &$this->render_set($this->sql->select($sub_request));
-				if (sizeof($temp))
-					$record["data"] = $temp;
-			}
-			$output[] = $record;
-			$index++;
-		}
-		return $output;
-	}	
-
 	protected function output_as_xml($res){
 		$data = array();
 		$data["parent"] = $this->request->get_relation();
 		$data["data"] = $this->render_set($res);
-
 		$out = new OutputWriter(json_encode($data), "");
 		$out->set_type("json");
 		$this->event->trigger("beforeOutput", $this, $out);
diff --git a/codebase/grid_connector.php b/codebase/grid_connector.php
index 2fe043e..229e9ff 100644
--- a/codebase/grid_connector.php
+++ b/codebase/grid_connector.php
@@ -145,10 +145,11 @@ class GridConnector extends Connector{
 		@param data_type
 			name of class which will be used for dataprocessor calls handling, optional, DataProcessor class will be used by default. 
 	*/		
-	public function __construct($res,$type=false,$item_type=false,$data_type=false){
+	public function __construct($res,$type=false,$item_type=false,$data_type=false,$render_type=false){
 		if (!$item_type) $item_type="GridDataItem";
 		if (!$data_type) $data_type="GridDataProcessor";
-		parent::__construct($res,$type,$item_type,$data_type);
+		if (!$render_type) $render_type="RenderStrategy";
+		parent::__construct($res,$type,$item_type,$data_type,$render_type);
 	}
 
 
diff --git a/codebase/scheduler_connector.php b/codebase/scheduler_connector.php
index 4ee0bd1..f9921b1 100644
--- a/codebase/scheduler_connector.php
+++ b/codebase/scheduler_connector.php
@@ -86,11 +86,14 @@ class SchedulerConnector extends Connector{
 			name of class, which will be used for item rendering, optional, DataItem will be used by default
 		@param data_type
 			name of class which will be used for dataprocessor calls handling, optional, DataProcessor class will be used by default. 
+	 * @param render_type
+			name of class which will be used for rendering.
 	*/	
-	public function __construct($res,$type=false,$item_type=false,$data_type=false){
+	public function __construct($res,$type=false,$item_type=false,$data_type=false,$render_type=false){
 		if (!$item_type) $item_type="SchedulerDataItem";
 		if (!$data_type) $data_type="SchedulerDataProcessor";
-		parent::__construct($res,$type,$item_type,$data_type);
+		if (!$render_type) $render_type="RenderStrategy";
+		parent::__construct($res,$type,$item_type,$data_type,$render_type);
 	}
 
 	//parse GET scoope, all operations with incoming request must be done here
@@ -159,32 +162,13 @@ class JSONSchedulerConnector extends SchedulerConnector {
 		@param data_type
 			name of class which will be used for dataprocessor calls handling, optional, DataProcessor class will be used by default. 
 	*/	
-	public function __construct($res,$type=false,$item_type=false,$data_type=false){
+	public function __construct($res,$type=false,$item_type=false,$data_type=false,$render_type=false){
 		if (!$item_type) $item_type="JSONSchedulerDataItem";
 		if (!$data_type) $data_type="SchedulerDataProcessor";
-		parent::__construct($res,$type,$item_type,$data_type);
+		if (!$render_type) $render_type="JSONRenderStrategy";
+		parent::__construct($res,$type,$item_type,$data_type,$render_type);
 	}
-	
-	/*! render from DB resultset
-		@param res
-			DB resultset 
-		process commands, output requested data as XML
-	*/
-	protected function render_set($res){
-		$output=array();
-		$index=0;
-		$this->event->trigger("beforeRenderSet",$this,$res,$this->config);
-		while ($data=$this->sql->get_next($res)){
-			$data = new $this->names["item_class"]($data,$this->config,$index);
-			if ($data->get_id()===false)
-				$data->set_id($this->uuid());
-			$this->event->trigger("beforeRender",$data);
-			$output[]=$data->to_xml();
-			$index++;
-		}
-		return json_encode($output);
-	}
-	
+
 	protected function xml_start() {
 		return '{ "data":';
 	}
diff --git a/codebase/strategy.php b/codebase/strategy.php
new file mode 100644
index 0000000..506a5e6
--- /dev/null
+++ b/codebase/strategy.php
@@ -0,0 +1,200 @@
+<?php
+
+class RenderStrategy {
+
+	/*! render from DB resultset
+		@param res
+			DB resultset 
+		process commands, output requested data as XML
+	*/
+	public function render_set($res, $conn, $name, $dload, $sep){
+		$output="";
+		$index=0;
+		$conn->event->trigger("beforeRenderSet",$conn,$res,$conn->get_config());
+		while ($data=$conn->sql->get_next($res)){
+			$data = new $name($data,$conn->get_config(),$index);
+			if ($data->get_id()===false)
+				$data->set_id($conn->uuid());
+			$conn->event->trigger("beforeRender",$data);
+			$output.=$data->to_xml().$sep;
+			$index++;
+		}
+		return $output;
+	}
+
+}
+
+class JSONRenderStrategy {
+
+	/*! render from DB resultset
+		@param res
+			DB resultset 
+		process commands, output requested data as json
+	*/
+	public function render_set($res, $conn, $name, $dload, $sep){
+		$output=array();
+		$index=0;
+		$conn->event->trigger("beforeRenderSet",$conn,$res,$conn->get_config());
+		while ($data=$conn->sql->get_next($res)){
+			$data = new $name($data,$conn->get_config(),$index);
+			if ($data->get_id()===false)
+				$data->set_id($conn->uuid());
+			$conn->event->trigger("beforeRender",$data);
+			$output[]=$data->to_xml();
+			$index++;
+		}
+		return json_encode($output);
+	}
+
+}
+
+class TreeRenderStrategy extends RenderStrategy {
+
+	public function render_set($res, $conn, $name, $dload, $sep){
+		$output="";
+		$index=0;
+		while ($data=$conn->sql->get_next($res)){
+			$data = new $name($data,$conn->get_config(),$index);
+			$conn->event->trigger("beforeRender",$data);
+			//there is no info about child elements,
+			//if we are using dyn. loading - assume that it has,
+			//in normal mode juse exec sub-render routine
+			if ($data->has_kids()===-1 && $dload)
+					$data->set_kids(true);
+			$output.=$data->to_xml_start();
+			if ($data->has_kids()===-1 || ( $data->has_kids()==true && !$dload)){
+				$sub_request = new DataRequestConfig($conn->get_request());
+				$sub_request->set_relation($data->get_id());
+				$output.=$this->render_set($conn->sql->select($sub_request), $conn, $name, $dload, $sep);
+			}
+			$output.=$data->to_xml_end();
+			$index++;
+		}
+		return $output;
+	}
+
+}
+
+
+
+class JSONTreeRenderStrategy extends RenderStrategy {
+
+	public function render_set($res, $conn, $name, $dload, $sep){
+		$output=array();
+		$index=0;
+		while ($data=$conn->sql->get_next($res)){
+			$data = new $name($data,$conn->get_config(),$index);
+			$conn->event->trigger("beforeRender",$data);
+			//there is no info about child elements, 
+			//if we are using dyn. loading - assume that it has,
+			//in normal mode just exec sub-render routine			
+			if ($data->has_kids()===-1 && $dload)
+					$data->set_kids(true);
+			$record = $data->to_xml_start();
+			if ($data->has_kids()===-1 || ( $data->has_kids()==true && !$dload)){
+				$sub_request = new DataRequestConfig($conn->get_request());
+				$sub_request->set_relation($data->get_id());
+				$temp = $this->render_set($conn->sql->select($sub_request), $conn, $name, $dload, $sep);
+				if (sizeof($temp))
+					$record["data"] = $temp;
+			}
+			$output[] = $record;
+			$index++;
+		}
+		return $output;
+	}	
+
+}
+
+
+class MultitableRenderStrategy extends RenderStrategy {
+
+	public function render_set($res, $conn, $name, $dload, $sep){
+		$output="";
+		$index=0;
+		$config = $conn->get_config();
+		while ($data=$conn->sql->get_next($res)){
+			$data[$config->id['name']] = $conn->level_id($data[$config->id['name']]);
+			$data = new $name($data,$config,$index);
+			$conn->event->trigger("beforeRender",$data);
+			if (($conn->getMaxLevel() !== null)&&($conn->get_level() == $conn->getMaxLevel())) {
+				$data->set_kids(false);
+			} else {
+				if ($data->has_kids()===-1)
+					$data->set_kids(true);
+			}
+			$output.=$data->to_xml_start();
+			$output.=$data->to_xml_end();
+			$index++;
+		}
+		return $output;
+	}
+
+}
+
+
+class JSONMultitableRenderStrategy extends MultitableRenderStrategy {
+
+	public function render_set($res, $conn, $name, $dload, $sep){
+		$output=array();
+		$index=0;
+		$config = $conn->get_config();
+		while ($data=$conn->sql->get_next($res)){
+			$data[$config->id['name']] = $conn->level_id($data[$config->id['name']]);
+			$data = new $name($data,$config,$index);
+			$conn->event->trigger("beforeRender",$data);
+
+			if ($conn->is_max_level()) {
+				$data->set_kids(false);
+			} else {
+				if ($data->has_kids()===-1)
+					$data->set_kids(true);
+			}
+			$record = $data->to_xml_start($output);
+			$output[] = $record;
+			$index++;
+		}
+		return $output;
+	}
+
+}
+
+
+class GroupRenderStrategy extends RenderStrategy {
+
+	public function render_set($res, $conn, $name, $dload, $sep){
+		$output="";
+		$index=0;
+		$config = $conn->get_config();
+		while ($data=$conn->sql->get_next($res)){
+			if (isset($data[$config->id['name']])) {
+				$has_kids = false;
+			} else {
+				$data[$config->id['name']] = $data['value'].$conn->get_id_postfix();
+				$data[$config->text[0]['name']] = $data['value'];
+				$has_kids = true;
+			}
+			$data = new $name($data,$config,$index);
+			$conn->event->trigger("beforeRender",$data);
+			if ($has_kids === false) {
+				$data->set_kids(false);
+			}
+
+			if ($data->has_kids()===-1 && $dload)
+				$data->set_kids(true);
+			$output.=$data->to_xml_start();
+			if (($data->has_kids()===-1 || ( $data->has_kids()==true && !$dload))&&($has_kids == true)){
+				$sub_request = new DataRequestConfig($conn->get_request());
+				$sub_request->set_relation(str_replace($conn->get_id_postfix(), "", $data->get_id()));
+				$output.=$this->render_set($conn->sql->select($sub_request), $conn, $name, $dload, $sep);
+			}
+			$output.=$data->to_xml_end();
+			$index++;
+		}
+		return $output;
+	}
+
+}
+
+
+?>
\ No newline at end of file
diff --git a/codebase/tree_connector.php b/codebase/tree_connector.php
index dff0867..d002304 100644
--- a/codebase/tree_connector.php
+++ b/codebase/tree_connector.php
@@ -174,10 +174,11 @@ class TreeConnector extends Connector{
 		@param data_type
 			name of class which will be used for dataprocessor calls handling, optional, DataProcessor class will be used by default. 
 	*/	
-	public function __construct($res,$type=false,$item_type=false,$data_type=false){
+	public function __construct($res,$type=false,$item_type=false,$data_type=false, $render_type=false){
 		if (!$item_type) $item_type="TreeDataItem";
 		if (!$data_type) $data_type="TreeDataProcessor";
-		parent::__construct($res,$type,$item_type,$data_type);
+		if (!$render_type) $render_type="TreeRenderStrategy";
+		parent::__construct($res,$type,$item_type,$data_type,$render_type);
 		
 		$this->event->attach("afterInsert",array($this,"parent_id_correction_a"));
 		$this->event->attach("beforeProcessing",array($this,"parent_id_correction_b"));
@@ -213,31 +214,7 @@ class TreeConnector extends Connector{
 			
 		$this->request->set_limit(0,0); //netralize default reaction on dyn. loading mode
 	}
-	
 
-   
-	protected function render_set($res){
-		$output="";
-		$index=0;
-		while ($data=$this->sql->get_next($res)){
-			$data = new $this->names["item_class"]($data,$this->config,$index);
-			$this->event->trigger("beforeRender",$data);
-		//there is no info about child elements, 
-		//if we are using dyn. loading - assume that it has,
-		//in normal mode juse exec sub-render routine			
-			if ($data->has_kids()===-1 && $this->dload)
-					$data->set_kids(true);
-			$output.=$data->to_xml_start();
-			if ($data->has_kids()===-1 || ( $data->has_kids()==true && !$this->dload)){
-				$sub_request = new DataRequestConfig($this->request);
-				$sub_request->set_relation($data->get_id());
-				$output.=$this->render_set($this->sql->select($sub_request));
-			}
-			$output.=$data->to_xml_end();
-			$index++;
-		}
-		return $output;
-	}
    /*! renders self as  xml, starting part
 	*/
 	public function xml_start(){
diff --git a/codebase/treedatamultitable_connector.php b/codebase/treedatamultitable_connector.php
index f7bd43f..af00b88 100644
--- a/codebase/treedatamultitable_connector.php
+++ b/codebase/treedatamultitable_connector.php
@@ -10,9 +10,10 @@ class TreeDataMultitableConnector extends TreeDataConnector{
 	protected $level = 0;
 	protected $max_level = null;
 
-	public function __construct($res,$type=false,$item_type=false,$data_type=false){
-		$data_type="TreeDataProcessor";
-		parent::__construct($res,$type,$item_type,$data_type);
+	public function __construct($res,$type=false,$item_type=false,$data_type=false,$render_type=false){
+		if (!$data_type) $data_type="TreeDataProcessor";
+		if (!$render_type) $render_type="MultitableRenderStrategy";
+		parent::__construct($res,$type,$item_type,$data_type,$render_type);
 		$this->event->attach("beforeProcessing", Array($this, 'id_translate_before'));
 		$this->event->attach("afterProcessing", Array($this, 'id_translate_after'));
 	}
@@ -64,27 +65,6 @@ class TreeDataMultitableConnector extends TreeDataConnector{
 		$this->end_run();
 	}
 
-	protected function render_set($res){
-		$output="";
-		$index=0;
-		while ($data=$this->sql->get_next($res)){
-			$data[$this->config->id['name']] = $this->level_id($data[$this->config->id['name']]);
-			$data = new $this->names["item_class"]($data,$this->config,$index);
-			$this->event->trigger("beforeRender",$data);
-
-			if ($this->is_max_level()) {
-				$data->set_kids(false);
-			} else {
-				if ($data->has_kids()===-1)
-					$data->set_kids(true);
-			}
-			$output.=$data->to_xml_start();
-			$output.=$data->to_xml_end();
-			$index++;
-		}
-		return $output;
-	}
-
 	public function xml_start(){
 		if (isset($_GET['parent'])) {
 			return "<data parent='".$_GET['parent']."'>";
@@ -131,13 +111,19 @@ class TreeDataMultitableConnector extends TreeDataConnector{
 	}
 
 
-	protected function is_max_level() {
+	/*! gets maximum level of tree data
+	*/
+	public function getMaxLevel() {
+		return $this->max_level;
+	}
+
+
+	public function is_max_level() {
 		if (($this->max_level !== null) && ($this->level >= $this->max_level))
 			return true;
 		return false;
-		
 	}
-	
+
 
 	/*! remove level prefix from id, parent id and set new id before processing
 		@param action
@@ -178,28 +164,8 @@ class JSONTreeDataMultitableConnector extends TreeDataMultitableConnector{
 	public function __construct($res,$type=false,$item_type=false,$data_type=false){
 		if (!$item_type) $item_type="JSONTreeCommonDataItem";
 		if (!$data_type) $data_type="CommonDataProcessor";
-		parent::__construct($res,$type,$item_type,$data_type);
-	}
-
-	protected function render_set($res){
-		$output=array();
-		$index=0;
-		while ($data=$this->sql->get_next($res)){
-			$data[$this->config->id['name']] = $this->level_id($data[$this->config->id['name']]);
-			$data = new $this->names["item_class"]($data,$this->config,$index);
-			$this->event->trigger("beforeRender",$data);
-
-			if ($this->is_max_level()) {
-				$data->set_kids(false);
-			} else {
-				if ($data->has_kids()===-1)
-					$data->set_kids(true);
-			}
-			$record = $data->to_xml_start($output);
-			$output[] = $record;
-			$index++;
-		}
-		return $output;
+		if (!$render_type) $render_type="JSONMultitableRenderStrategy";
+		parent::__construct($res,$type,$item_type,$data_type,$render_type);
 	}
 
 	protected function output_as_xml($res){
diff --git a/codebase/treegrid_connector.php b/codebase/treegrid_connector.php
index 308fcf4..f1270bf 100644
--- a/codebase/treegrid_connector.php
+++ b/codebase/treegrid_connector.php
@@ -66,10 +66,11 @@ class TreeGridConnector extends GridConnector{
 		@param data_type
 			name of class which will be used for dataprocessor calls handling, optional, DataProcessor class will be used by default. 
 	*/	
-	public function __construct($res,$type=false,$item_type=false,$data_type=false){
+	public function __construct($res,$type=false,$item_type=false,$data_type=false,$render_type=false){
 		if (!$item_type) $item_type="TreeGridDataItem";
 		if (!$data_type) $data_type="TreeGridDataProcessor";
-		parent::__construct($res,$type,$item_type,$data_type);
+		if (!$render_type) $render_type="TreeRenderStrategy";
+		parent::__construct($res,$type,$item_type,$data_type,$render_type);
 	
 		$this->event->attach("afterInsert",array($this,"parent_id_correction_a"));
 		$this->event->attach("beforeProcessing",array($this,"parent_id_correction_b"));
@@ -106,32 +107,8 @@ class TreeGridConnector extends GridConnector{
 			
 		$this->request->set_limit(0,0); //netralize default reaction on dyn. loading mode
 	}
-	
-	/*! process treegrid specific options in incoming request
-	*/	
-	protected function render_set($res){
-		$output="";
-		$index=0;
-		while ($data=$this->sql->get_next($res)){
-			$data = new $this->names["item_class"]($data,$this->config,$index);
-			$this->event->trigger("beforeRender",$data);
-		//there is no info about child elements, 
-		//if we are using dyn. loading - assume that it has,
-		//in normal mode juse exec sub-render routine			
-			if ($data->has_kids()===-1 && $this->dload)
-					$data->set_kids(true);
-			$output.=$data->to_xml_start();
-			if ($data->has_kids()===-1 || ( $data->has_kids()==true && !$this->dload)){
-				$sub_request = new DataRequestConfig($this->request);
-				$sub_request->set_relation($data->get_id());
-				$output.=$this->render_set($this->sql->select($sub_request));
-			}
-			$output.=$data->to_xml_end();
-			$index++;
-		}
-		return $output;
-	}	
-	
+
+
 	/*! renders self as  xml, starting part
 	*/	
 	protected function xml_start(){
diff --git a/codebase/treegridgroup_connector.php b/codebase/treegridgroup_connector.php
index b8c725e..4140c2c 100644
--- a/codebase/treegridgroup_connector.php
+++ b/codebase/treegridgroup_connector.php
@@ -9,12 +9,18 @@ class TreeGridGroupConnector extends TreeGridConnector{
 
 	private $id_postfix = '__{group_param}';
 
-	public function __construct($res,$type=false,$item_type=false,$data_type=false){
-		parent::__construct($res,$type,$item_type,$data_type);
+	public function __construct($res,$type=false,$item_type=false,$data_type=false,$render_type=false){
+		if (!$render_type) $render_type="GroupRenderStrategy";
+		parent::__construct($res,$type,$item_type,$data_type,$render_type);
 		$this->event->attach("beforeProcessing", Array($this, 'check_id'));
 	}
 
 
+	public function get_id_postfix() {
+		return $this->id_postfix;
+	}
+
+
 	public function render(){
 		if (isset($_GET['id'])) {
 			$_GET['id'] = str_replace($this->id_postfix, "", $_GET['id']);
@@ -55,40 +61,6 @@ class TreeGridGroupConnector extends TreeGridConnector{
 		$this->end_run();
 	}
 
-
-	protected function render_set($res){
-		$output="";
-		$index=0;
-		$records = Array();
-		while ($data=$this->sql->get_next($res)){
-			if (isset($data[$this->config->id['name']])) {
-				$has_kids = false;
-			} else {
-				$data[$this->config->id['name']] = $data['value'].$this->id_postfix;
-				$data[$this->config->text[0]['name']] = $data['value'];
-				$has_kids = true;
-			}
-			$data = new $this->names["item_class"]($data,$this->config,$index);
-			$this->event->trigger("beforeRender",$data);
-			if ($has_kids === false) {
-				$data->set_kids(false);
-			}
-
-			if ($data->has_kids()===-1 && $this->dload)
-					$data->set_kids(true);
-			$output.=$data->to_xml_start();
-			if (($data->has_kids()===-1 || ( $data->has_kids()==true && !$this->dload))&&($has_kids == true)){
-				$sub_request = new DataRequestConfig($this->request);
-				$sub_request->set_relation(str_replace($this->id_postfix, "", $data->get_id()));
-				$output.=$this->render_set($this->sql->select($sub_request));
-			}
-			$output.=$data->to_xml_end();
-			$index++;
-		}
-		return $output;
-	}
-
-
 	/*! renders self as  xml, starting part
 	*/	
 	protected function xml_start(){
diff --git a/codebase/treegridmultitable_connector.php b/codebase/treegridmultitable_connector.php
index 29e0dbd..4e7f38a 100644
--- a/codebase/treegridmultitable_connector.php
+++ b/codebase/treegridmultitable_connector.php
@@ -10,9 +10,10 @@ class TreeGridMultitableConnector extends TreeGridConnector{
 	private $level = 0;
 	private $max_level = null;
 
-	public function __construct($res,$type=false,$item_type=false,$data_type=false){
+	public function __construct($res,$type=false,$item_type=false,$data_type=false,$render_type=false){
 		$data_type="TreeGridMultitableDataProcessor";
-		parent::__construct($res,$type,$item_type,$data_type);
+		if (!$render_type) $render_type="MultitableRenderStrategy";
+		parent::__construct($res,$type,$item_type,$data_type,$render_type);
 		$this->event->attach("beforeProcessing", Array($this, 'id_translate_before'));
 		$this->event->attach("afterProcessing", Array($this, 'id_translate_after'));
 	}
@@ -49,28 +50,6 @@ class TreeGridMultitableConnector extends TreeGridConnector{
 	}
 
 
-	protected function render_set($res){
-		$output="";
-		$index=0;
-		$records = Array();
-		while ($data=$this->sql->get_next($res)){
-			$data[$this->config->id['name']] = $this->level.'%23'.$data[$this->config->id['name']];
-			$data = new $this->names["item_class"]($data,$this->config,$index);
-			$this->event->trigger("beforeRender",$data);
-			if (($this->max_level !== null)&&($this->level == $this->max_level)) {
-				$data->set_kids(false);
-			} else {
-				if ($data->has_kids()===-1)
-					$data->set_kids(true);
-			}
-			$output.=$data->to_xml_start();
-			$output.=$data->to_xml_end();
-			$index++;
-		}
-		return $output;
-	}
-
-
 	public function xml_start(){
 		if (isset($_GET['id'])) {
 			return "<rows parent='".($this->level - 1).'%23'.$_GET['id']."'>";
@@ -81,6 +60,7 @@ class TreeGridMultitableConnector extends TreeGridConnector{
 
 
 	public function get_level() {
+		if ($this->level) return $this->level;
 		if (!isset($_GET['id'])) {
 			if (isset($_POST['ids'])) {
 				$ids = explode(",",$_POST["ids"]);
@@ -109,7 +89,7 @@ class TreeGridMultitableConnector extends TreeGridConnector{
 
 
 	public function level_id($id) {
-		return $this->level.'#'.$id;
+		return $this->level.'%23'.$id;
 	}
 
 
@@ -122,6 +102,13 @@ class TreeGridMultitableConnector extends TreeGridConnector{
 	}
 
 
+	/*! gets maximum level of tree
+	*/
+	public function getMaxLevel() {
+		return $this->max_level;
+	}
+
+
 	/*! remove level prefix from id, parent id and set new id before processing
 		@param action
 			DataAction object
diff --git a/codebase/treegroup_connector.php b/codebase/treegroup_connector.php
index 16db63c..80a15f1 100644
--- a/codebase/treegroup_connector.php
+++ b/codebase/treegroup_connector.php
@@ -9,12 +9,18 @@ class TreeGroupConnector extends TreeConnector{
 
 	private $id_postfix = '__{group_param}';
 
-	public function __construct($res,$type=false,$item_type=false,$data_type=false){
-		parent::__construct($res,$type,$item_type,$data_type);
+	public function __construct($res,$type=false,$item_type=false,$data_type=false,$render_type=false){
+		if (!$render_type) $render_type="GroupRenderStrategy";
+		parent::__construct($res,$type,$item_type,$data_type,$render_type);
 		$this->event->attach("beforeProcessing", Array($this, 'check_id'));
 	}
 
 
+	public function get_id_postfix() {
+		return $this->id_postfix;
+	}
+
+
 	public function render(){
 		if (isset($_GET['id'])) {
 			$_GET['id'] = str_replace($this->id_postfix, "", $_GET['id']);
@@ -55,38 +61,9 @@ class TreeGroupConnector extends TreeConnector{
 		$this->end_run();
 	}
 
-	protected function render_set($res){
-		$output="";
-		$index=0;
-		$records = Array();
-		while ($data=$this->sql->get_next($res)){
-			if (isset($data[$this->config->id['name']])) {
-				$has_kids = false;
-			} else {
-				$data[$this->config->id['name']] = $data['value'].$this->id_postfix;
-				$data[$this->config->text[0]['name']] = $data['value'];
-				$has_kids = true;
-			}
-			$data = new $this->names["item_class"]($data,$this->config,$index);
-			$this->event->trigger("beforeRender",$data);
-			if ($has_kids === false) {
-				$data->set_kids(false);
-			}
-
-			if ($data->has_kids()===-1 && $this->dload)
-					$data->set_kids(true);
-			$output.=$data->to_xml_start();
-			if (($data->has_kids()===-1 || ( $data->has_kids()==true && !$this->dload))&&($has_kids == true)){
-				$sub_request = new DataRequestConfig($this->request);
-				$sub_request->set_relation(str_replace($this->id_postfix, "", $data->get_id()));
-				$output.=$this->render_set($this->sql->select($sub_request));
-			}
-			$output.=$data->to_xml_end();
-			$index++;
-		}
-		return $output;
-	}
 
+	/*! renders self as  xml, starting part
+	*/
 	public function xml_start(){
 		if (isset($_GET['id'])) {
 			return "<tree id='".$_GET['id'].$this->id_postfix."'>";
diff --git a/codebase/treemultitable_connector.php b/codebase/treemultitable_connector.php
index 0493f4c..8e96a83 100644
--- a/codebase/treemultitable_connector.php
+++ b/codebase/treemultitable_connector.php
@@ -9,10 +9,10 @@ class TreeMultitableConnector extends TreeConnector{
 
 	private $level = 0;
 	private $max_level = null;
-
-	public function __construct($res,$type=false,$item_type=false,$data_type=false){
-		$data_type="TreeDataProcessor";
-		parent::__construct($res,$type,$item_type,$data_type);
+	public function __construct($res,$type=false,$item_type=false,$data_type=false,$render_type=false){
+		if (!$data_type) $data_type="TreeDataProcessor";
+		if (!$render_type) $render_type="MultitableRenderStrategy";
+		parent::__construct($res,$type,$item_type,$data_type,$render_type);
 		$this->event->attach("beforeProcessing", Array($this, 'id_translate_before'));
 		$this->event->attach("afterProcessing", Array($this, 'id_translate_after'));
 	}
@@ -49,27 +49,6 @@ class TreeMultitableConnector extends TreeConnector{
 		$this->end_run();
 	}
 
-	protected function render_set($res){
-		$output="";
-		$index=0;
-		$records = Array();
-		while ($data=$this->sql->get_next($res)){
-			$data[$this->config->id['name']] = $this->level_id($data[$this->config->id['name']]);
-			$data = new $this->names["item_class"]($data,$this->config,$index);
-			$this->event->trigger("beforeRender",$data);
-			if (($this->max_level !== null)&&($this->level == $this->max_level)) {
-				$data->set_kids(false);
-			} else {
-				if ($data->has_kids()===-1)
-					$data->set_kids(true);
-			}
-			$output.=$data->to_xml_start();
-			$output.=$data->to_xml_end();
-			$index++;
-		}
-		return $output;
-	}
-
 	public function xml_start(){
 		if (isset($_GET['id'])) {
 			return "<tree id='".($this->level - 1).'#'.$_GET['id']."'>";
@@ -80,6 +59,7 @@ class TreeMultitableConnector extends TreeConnector{
 
 
 	public function get_level() {
+		if ($this->level) return $this->level;
 		if (!isset($_GET['id'])) {
 			if (isset($_POST['ids'])) {
 				$ids = explode(",",$_POST["ids"]);
@@ -125,6 +105,20 @@ class TreeMultitableConnector extends TreeConnector{
 	}
 
 
+	/*! gets maximum level of tree
+	*/
+	public function getMaxLevel() {
+		return $this->max_level;
+	}
+
+
+	public function is_max_level() {
+		if (($this->max_level !== null) && ($this->level >= $this->max_level))
+			return true;
+		return false;
+	}
+
+
 	/*! remove level prefix from id, parent id and set new id before processing
 		@param action
 			DataAction object