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<?php
/**
 * Akeeba Engine
 *
 * @package   akeebaengine
 * @copyright Copyright (c)2006-2024 Nicholas K. Dionysopoulos / Akeeba Ltd
 * @license   https://www.gnu.org/licenses/gpl-3.0.html GNU General Public License version 3, or later
 *
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program. If not, see
 * <https://www.gnu.org/licenses/>.
 */

namespace Akeeba\Engine\Driver\Query;

defined('AKEEBAENGINE') || die();

/**
 * Query Element Class.
 *
 * Based on Joomla! Platform 11.3
 */
class Element
{
	/**
	 * @var    string  The name of the element.
	 */
	protected $name = null;

/**
	 * @var    array  An array of elements.
	 */
	protected $elements = null;

/**
	 * @var    string  Glue piece.
	 */
	protected $glue = null;

/**
	 * Constructor.
	 *
	 * @param   string  $name      The name of the element.
	 * @param   mixed   $elements  String or array.
	 * @param   string  $glue      The glue for elements.
	 */
	public function __construct($name, $elements, $glue = ',')
	{
		$this->elements = [];
		$this->name     = $name;
		$this->glue     = $glue;

$this->append($elements);
	}

/**
	 * Magic function to convert the query element to a string.
	 *
	 * @return  string
	 */
	public function __toString()
	{
		if (substr($this->name, -2) == '()')
		{
			return PHP_EOL . substr($this->name, 0, -2) . '(' . implode($this->glue, $this->elements) . ')';
		}
		else
		{
			return PHP_EOL . $this->name . ' ' . implode($this->glue, $this->elements);
		}
	}

/**
	 * Appends element parts to the internal list.
	 *
	 * @param   mixed  $elements  String or array.
	 *
	 * @return  void
	 */
	public function append($elements)
	{
		if (is_array($elements))
		{
			$this->elements = array_merge($this->elements, $elements);
		}
		else
		{
			$this->elements = array_merge($this->elements, [$elements]);
		}
	}

/**
	 * Gets the elements of this element.
	 *
	 * @return  string
	 */
	public function getElements()
	{
		return $this->elements;
	}

/**
	 * Method to provide deep copy support to nested objects and arrays
	 * when cloning.
	 *
	 * @return  void
	 */
	public function __clone()
	{
		foreach ($this as $k => $v)
		{
			if (is_object($v) || is_array($v))
			{
				$this->{$k} = unserialize(serialize($v));
			}
		}
	}
}

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