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: iterator.php

<?php
/**
 * @package     Joomla.Platform
 * @subpackage  Database
 *
 * @copyright   Copyright (C) 2005 - 2018 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

/**
 * Joomla Platform Database Driver Class
 *
 * @since  3.0.0
 */
abstract class JDatabaseIterator implements Countable, Iterator
{
	/**
	 * The database cursor.
	 *
	 * @var    mixed
	 * @since  3.0.0
	 */
	protected $cursor;

/**
	 * The class of object to create.
	 *
	 * @var    string
	 * @since  3.0.0
	 */
	protected $class;

/**
	 * The name of the column to use for the key of the database record.
	 *
	 * @var    mixed
	 * @since  3.0.0
	 */
	private $_column;

/**
	 * The current database record.
	 *
	 * @var    mixed
	 * @since  3.0.0
	 */
	private $_current;

/**
	 * A numeric or string key for the current database record.
	 *
	 * @var    int|string
	 * @since  3.0.0
	 */
	private $_key;

/**
	 * The number of fetched records.
	 *
	 * @var    integer
	 * @since  3.0.0
	 */
	private $_fetched = 0;

/**
	 * Database iterator constructor.
	 *
	 * @param   mixed   $cursor  The database cursor.
	 * @param   string  $column  An option column to use as the iterator key.
	 * @param   string  $class   The class of object that is returned.
	 *
	 * @throws  InvalidArgumentException
	 */
	public function __construct($cursor, $column = null, $class = 'stdClass')
	{
		if (!class_exists($class))
		{
			throw new InvalidArgumentException(sprintf('new %s(*%s*, cursor)', get_class($this), gettype($class)));
		}

$this->cursor = $cursor;
		$this->class = $class;
		$this->_column = $column;
		$this->_fetched = 0;
		$this->next();
	}

/**
	 * Database iterator destructor.
	 *
	 * @since   3.0.0
	 */
	public function __destruct()
	{
		if ($this->cursor)
		{
			$this->freeResult($this->cursor);
		}
	}

/**
	 * The current element in the iterator.
	 *
	 * @return  object
	 *
	 * @see     Iterator::current()
	 * @since   3.0.0
	 */
	public function current()
	{
		return $this->_current;
	}

/**
	 * The key of the current element in the iterator.
	 *
	 * @return  int|string
	 *
	 * @see     Iterator::key()
	 * @since   3.0.0
	 */
	public function key()
	{
		return $this->_key;
	}

/**
	 * Moves forward to the next result from the SQL query.
	 *
	 * @return  void
	 *
	 * @see     Iterator::next()
	 * @since   3.0.0
	 */
	public function next()
	{
		// Set the default key as being the number of fetched object
		$this->_key = $this->_fetched;

// Try to get an object
		$this->_current = $this->fetchObject();

// If an object has been found
		if ($this->_current)
		{
			// Set the key as being the indexed column (if it exists)
			if (isset($this->_current->{$this->_column}))
			{
				$this->_key = $this->_current->{$this->_column};
			}

// Update the number of fetched object
			$this->_fetched++;
		}
	}

/**
	 * Rewinds the iterator.
	 *
	 * This iterator cannot be rewound.
	 *
	 * @return  void
	 *
	 * @see     Iterator::rewind()
	 * @since   3.0.0
	 */
	public function rewind()
	{
	}

/**
	 * Checks if the current position of the iterator is valid.
	 *
	 * @return  boolean
	 *
	 * @see     Iterator::valid()
	 * @since   3.0.0
	 */
	public function valid()
	{
		return (boolean) $this->_current;
	}

/**
	 * Method to fetch a row from the result set cursor as an object.
	 *
	 * @return  mixed  Either the next row from the result set or false if there are no more rows.
	 *
	 * @since   3.0.0
	 */
	abstract protected function fetchObject();

/**
	 * Method to free up the memory used for the result set.
	 *
	 * @return  void
	 *
	 * @since   3.0.0
	 */
	abstract protected function freeResult();
}

NAME	TYPE	LAST MODIFIED	SIZE	OWNER / GROUP	PERMISSIONS	ACTION
..
database.php	f!le	2018-10-31 11:37	5 KB	lyceedesvo / users	-rw----r--
driver.php	f!le	2018-10-31 11:37	55.07 KB	lyceedesvo / users	-rw----r--
exporter.php	f!le	2018-10-31 11:37	4.41 KB	lyceedesvo / users	-rw----r--
factory.php	f!le	2018-10-31 11:37	5.35 KB	lyceedesvo / users	-rw----r--
importer.php	f!le	2018-10-31 11:37	4.86 KB	lyceedesvo / users	-rw----r--
index.html	f!le	2018-10-31 11:37	31 B	lyceedesvo / users	-rw----r--
interface.php	f!le	2018-10-31 11:37	551 B	lyceedesvo / users	-rw----r--
iterator.php	f!le	2018-10-31 11:37	3.65 KB	lyceedesvo / users	-rw----r--
query.php	f!le	2018-10-31 11:37	44.13 KB	lyceedesvo / users	-rw----r--

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