<?php

namespace Assetic\Filter;

use Assetic\Asset\AssetInterface;

/**
 * A collection of filters.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 */
class FilterCollection implements FilterInterface, \IteratorAggregate, \Countable
{
	private $filters = array();


	public function __construct($filters = array())
	{
		foreach ($filters as $filter) {
		    $this->ensure($filter);
		}
	}


	/**
	 * Checks that the current collection contains the supplied filter.
	 *
	 * If the supplied filter is another filter collection, each of its
	 * filters will be checked.
	 */
	public function ensure(FilterInterface $filter)
	{
		if ($filter instanceof \Traversable) {
		    foreach ($filter as $f) {
		        $this->ensure($f);
		    }
		} elseif (!in_array($filter, $this->filters, true)) {
		    $this->filters[] = $filter;
		}
	}


	public function all()
	{
		return $this->filters;
	}


	public function clear()
	{
		$this->filters = array();
	}


	public function filterLoad(AssetInterface $asset)
	{
		foreach ($this->filters as $filter) {
		    $filter->filterLoad($asset);
		}
	}


	public function filterDump(AssetInterface $asset)
	{
		foreach ($this->filters as $filter) {
		    $filter->filterDump($asset);
		}
	}


	public function getIterator()
	{
		return new \ArrayIterator($this->filters);
	}


	public function count()
	{
		return count($this->filters);
	}
}
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