<?
define ('DEBUG_COLLECTION', false);

class Collection implements Iterator
	{
	var $SQL, $ObjClass, $ReturnType = 'OBJECT';
	var $Length = 0, $Pos = 0, $Key = 0, $Value;
	
	public function __construct($Obj, $SQL_Result, $ReturnType = 'OBJECT')
		{
		if (DEBUG_COLLECTION) echo '__construct'."\n";
		$this->ReturnType = $ReturnType;
		if (DEBUG_COLLECTION) echo '__return_type : '."\n";
		
		$this->SQL = $SQL_Result;
		$this->Length = db_num_rows($this->SQL);
		
		if (is_object($Obj))
			{ $this->ObjClass = get_class($Obj); }
		else
			{ $this->ObjClass = $Obj; }
		}
	
	public function rewind()
		{
		if (DEBUG_COLLECTION) echo '__rewind'."\n";
		$this->Pos = 0;
		db_data_seek($this->SQL, $this->Pos);
		}
	
	public function current()
		{
		if (DEBUG_COLLECTION) echo '__current'."\n";
		db_data_seek($this->SQL, $this->Pos);
		
		switch ($this->ReturnType)
			{
			case 'ASSOC':
				$t = db_fetch_assoc($this->SQL);
				$this->Key = $t[0];
				$this->Value = $t;
			break;
			
			case 'KEY':
				$t = db_fetch_row($this->SQL);
				$this->Key = $t[0];
				$this->Value = $this->Key;
			break;
			
			case 'COUNT':
				$t = db_fetch_row($this->SQL);
				$this->Key = $t[0];
				$this->Value = $this->Length;
			break;
			
			case 'OBJECT':
			default:
				$t = db_fetch_row($this->SQL);
				$this->Key = $t[0];
				$this->Value = Factory::Build($this->ObjClass, $this->Key);
			break;
			}
		return $this->Value;
		}
	
	public function key()
		{
		if (DEBUG_COLLECTION) echo '__key'."\n";
		return $this->Key;
		}
	
	public function next()
		{
		if (DEBUG_COLLECTION) echo '__next'."\n";
		$this->Pos ++;
		}
	
	public function valid()
		{
		if (DEBUG_COLLECTION) echo '__valid'."\n";
		return ($this->Pos < $this->Length);
		}
	}
?>