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<?php
/**
* TMappedStatement and related classes.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2014 PradoSoft
* @license http://www.pradosoft.com/license/
* @package Prado\Data\SqlMap\Statements
*/
namespace Prado\Data\SqlMap\Statements;
use Prado\Collections\TList;
use Prado\Data\SqlMap\DataMapper\TPropertyAccess;
use Prado\Data\SqlMap\DataMapper\TSqlMapExecutionException;
/**
* TSQLMapObjectCollectionTree class.
*
* Maps object collection graphs as trees. Nodes in the collection can
* be {@link add} using parent relationships. The object collections can be
* build using the {@link collect} method.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @package Prado\Data\SqlMap\Statements
* @since 3.1
*/
class TSqlMapObjectCollectionTree extends \Prado\TComponent
{
/**
* @var array object graph as tree
*/
private $_tree = array();
/**
* @var array tree node values
*/
private $_entries = array();
/**
* @var array resulting object collection
*/
private $_list = array();
/**
* @return boolean true if the graph is empty
*/
public function isEmpty()
{
return count($this->_entries) == 0;
}
/**
* Add a new node to the object tree graph.
* @param string parent node id
* @param string new node id
* @param mixed node value
*/
public function add($parent, $node, $object='')
{
if(isset($this->_entries[$parent]) && ($this->_entries[$parent]!==null)
&& isset($this->_entries[$node]) && ($this->_entries[$node]!==null))
{
$this->_entries[$node] = $object;
return;
}
$this->_entries[$node] = $object;
if(empty($parent))
{
if(isset($this->_entries[$node]))
return;
$this->_tree[$node] = array();
}
$found = $this->addNode($this->_tree, $parent, $node);
if(!$found && !empty($parent))
{
$this->_tree[$parent] = array();
if(!isset($this->_entries[$parent]) || $object !== '')
$this->_entries[$parent] = $object;
$this->addNode($this->_tree, $parent, $node);
}
}
/**
* Find the parent node and add the new node as its child.
* @param array list of nodes to check
* @param string parent node id
* @param string new node id
* @return boolean true if parent node is found.
*/
protected function addNode(&$childs, $parent, $node)
{
$found = false;
reset($childs);
for($i = 0, $k = count($childs); $i < $k; $i++)
{
$key = key($childs);
next($childs);
if($key == $parent)
{
$found = true;
$childs[$key][$node] = array();
}
else
{
$found = $found || $this->addNode($childs[$key], $parent, $node);
}
}
return $found;
}
/**
* @return array object collection
*/
public function collect()
{
while(count($this->_tree) > 0)
$this->collectChildren(null, $this->_tree);
return $this->getCollection();
}
/**
* @param array list of nodes to check
* @return boolean true if all nodes are leaf nodes, false otherwise
*/
protected function hasChildren(&$nodes)
{
$hasChildren = false;
foreach($nodes as $node)
if(count($node) != 0)
return true;
return $hasChildren;
}
/**
* Visit all the child nodes and collect them by removing.
* @param string parent node id
* @param array list of child nodes.
*/
protected function collectChildren($parent, &$nodes)
{
$noChildren = !$this->hasChildren($nodes);
$childs = array();
for(reset($nodes); $key = key($nodes);)
{
next($nodes);
if($noChildren)
{
$childs[] = $key;
unset($nodes[$key]);
}
else
$this->collectChildren($key, $nodes[$key]);
}
if(count($childs) > 0)
$this->onChildNodesVisited($parent, $childs);
}
/**
* Set the object properties for all the child nodes visited.
* @param string parent node id
* @param array list of child nodes visited.
*/
protected function onChildNodesVisited($parent, $nodes)
{
if(empty($parent) || empty($this->_entries[$parent]))
return;
$parentObject = $this->_entries[$parent]['object'];
$property = $this->_entries[$nodes[0]]['property'];
$list = TPropertyAccess::get($parentObject, $property);
foreach($nodes as $node)
{
if($list instanceof TList)
$parentObject->{$property}[] = $this->_entries[$node]['object'];
else if(is_array($list))
$list[] = $this->_entries[$node]['object'];
else
throw new TSqlMapExecutionException(
'sqlmap_property_must_be_list');
}
if(is_array($list))
TPropertyAccess::set($parentObject, $property, $list);
if($this->_entries[$parent]['property'] === null)
$this->_list[] = $parentObject;
}
/**
* @return array object collection.
*/
protected function getCollection()
{
return $this->_list;
}
public function __sleep()
{
$exprops = array(); $cn = __CLASS__;
if (!count($this->_tree)) $exprops[] = "\0$cn\0_tree";
if (!count($this->_entries)) $exprops[] = "\0$cn\0_entries";
if (!count($this->_list)) $exprops[] = "\0$cn\0_list";
return array_diff(parent::__sleep(),$exprops);
}
}
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