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Directory : /var/www/html/vendor/nette/utils/src/Iterators/

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Current File : /var/www/html/vendor/nette/utils/src/Iterators/CachingIterator.php

<?php

/**
 * This file is part of the Nette Framework (https://nette.org)
 * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
 */

namespace Nette\Iterators;

use Nette;


/**
 * Smarter caching iterator.
 *
 * @property-read bool $first
 * @property-read bool $last
 * @property-read bool $empty
 * @property-read bool $odd
 * @property-read bool $even
 * @property-read int $counter
 * @property-read mixed $nextKey
 * @property-read mixed $nextValue
 */
class CachingIterator extends \CachingIterator implements \Countable
{
	use Nette\SmartObject;

	/** @var int */
	private $counter = 0;


	public function __construct($iterator)
	{
		if (is_array($iterator) || $iterator instanceof \stdClass) {
			$iterator = new \ArrayIterator($iterator);

		} elseif ($iterator instanceof \IteratorAggregate) {
			do {
				$iterator = $iterator->getIterator();
			} while ($iterator instanceof \IteratorAggregate);

		} elseif ($iterator instanceof \Traversable) {
			if (!$iterator instanceof \Iterator) {
				$iterator = new \IteratorIterator($iterator);
			}
		} else {
			throw new Nette\InvalidArgumentException(sprintf('Invalid argument passed to %s; array or Traversable expected, %s given.', __CLASS__, is_object($iterator) ? get_class($iterator) : gettype($iterator)));
		}

		parent::__construct($iterator, 0);
	}


	/**
	 * Is the current element the first one?
	 * @param  int  grid width
	 * @return bool
	 */
	public function isFirst($width = null)
	{
		return $this->counter === 1 || ($width && $this->counter !== 0 && (($this->counter - 1) % $width) === 0);
	}


	/**
	 * Is the current element the last one?
	 * @param  int  grid width
	 * @return bool
	 */
	public function isLast($width = null)
	{
		return !$this->hasNext() || ($width && ($this->counter % $width) === 0);
	}


	/**
	 * Is the iterator empty?
	 * @return bool
	 */
	public function isEmpty()
	{
		return $this->counter === 0;
	}


	/**
	 * Is the counter odd?
	 * @return bool
	 */
	public function isOdd()
	{
		return $this->counter % 2 === 1;
	}


	/**
	 * Is the counter even?
	 * @return bool
	 */
	public function isEven()
	{
		return $this->counter % 2 === 0;
	}


	/**
	 * Returns the counter.
	 * @return int
	 */
	public function getCounter()
	{
		return $this->counter;
	}


	/**
	 * Returns the count of elements.
	 * @return int
	 */
	public function count()
	{
		$inner = $this->getInnerIterator();
		if ($inner instanceof \Countable) {
			return $inner->count();

		} else {
			throw new Nette\NotSupportedException('Iterator is not countable.');
		}
	}


	/**
	 * Forwards to the next element.
	 * @return void
	 */
	public function next()
	{
		parent::next();
		if (parent::valid()) {
			$this->counter++;
		}
	}


	/**
	 * Rewinds the Iterator.
	 * @return void
	 */
	public function rewind()
	{
		parent::rewind();
		$this->counter = parent::valid() ? 1 : 0;
	}


	/**
	 * Returns the next key.
	 * @return mixed
	 */
	public function getNextKey()
	{
		return $this->getInnerIterator()->key();
	}


	/**
	 * Returns the next element.
	 * @return mixed
	 */
	public function getNextValue()
	{
		return $this->getInnerIterator()->current();
	}
}

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