<?php defined('SYSPATH') OR die('No direct script access.');
/**
 * DB2 database result.   See [Results](/database/results) for usage and examples.
 *
 * @package    Kohana/Database
 * @category   Query/Result
 * @author     Deon George
 * @copyright  (c) 2015 Deon George
 * @license    http://dev.leenooks.net/license
 */
class Kohana_Database_DB2_Result extends Database_Result {

	protected $_internal_row = 0;

	// if we cache queries, we need to preserve our data, otherwise it is lost
	protected $_internal_data = array();

	public function __construct($result, $sql, $as_object = FALSE, array $params = NULL)
	{
		parent::__construct($result, $sql, $as_object, $params);

		// Find the number of rows in the result
		$this->_total_rows = db2_num_rows($result);
	}

	public function __destruct()
	{
		if (is_resource($this->_result))
		{
			db2_free_result($this->_result);
		}
	}

	public function seek($offset)
	{
		if ($this->offsetExists($offset) AND db2_next_result($this->_result))
		{
			// Set the current row to the offset
			$this->_current_row = $this->_internal_row = $offset;

			return TRUE;
		}
		else
		{
			return isset($this->_internal_data[$offset+1]);
		}
	}

	public function current()
	{
		if ($this->_current_row !== $this->_internal_row AND ! $this->seek($this->_current_row))
			return NULL;

		// Increment internal row for optimization assuming rows are fetched in order
		$this->_internal_row++;

		if ($this->_as_object === TRUE)
		{
			throw new Kohana_Exception('This configuration is not tested for caching');
			// Return an stdClass
			return db2_fetch_object($this->_result);
		}
		elseif (is_string($this->_as_object))
		{
			throw new Kohana_Exception('This configuration is not tested for caching');
			$o = new $this->_as_object;

			// Return an object of given class name
			// @todo This doesnt have $this->_loaded = $this->_valid = TRUE;
			return $o->values(db2_fetch_assoc($this->_result));
		}
		else
		{
			// Return an array of the row
			return isset($this->_internal_data[$this->_internal_row])
				? $this->_internal_data[$this->_internal_row]
				: ($this->_internal_data[$this->_internal_row] = db2_fetch_assoc($this->_result));
		}
	}

	public function rewind() {
		$this->_internal_row = 0;

		return parent::rewind();
	}
} // End Database_DB2_Result