dlundgren/phrender

<?php

/**
 * @file
 * Contains \Phrender\Context\Collection
 */

namespace Phrender\Context;

use Interop\Output\Context;

/**
 * Collection of contexts
 *
 * @package Phrender\Context
 */
class Collection
    implements Context
{
    /**
     * @var \SplObjectStorage
     */
    private $storage;

    /**
     * Collection constructor.
     */
    public function __construct()
    {
        $this->storage = [];
    }

    /**
     * Add a context to the collection
     *
     * @param Context $context
     */
    public function add(Context $context)
    {
        $this->storage[spl_object_hash($context)] = $context;
    }

    /**
     * Remove a context from the collection
     *
     * @param Context $context
     */
    public function remove(Context $context)
    {
        if (isset($this->storage[$hash = spl_object_hash($context)])) {
            unset($this->storage[$hash]);
        }
    }

    /**
     * Determine if the collection has the context
     * @param Context $context
     * @return bool
     */
    public function has(Context $context)
    {
        return isset($this->storage[spl_object_hash($context)]);
    }

    /**
     * {@inheritdoc}
     */
    public function accepts($template)
    {
        $accepts = false;
        foreach($this->storage as $context) {
            $accepts |= $context->accepts($template);
        }

        return $accepts ? true : false;
    }

    /**
     * {@inheritdoc}
     */
    public function provide($template)
    {
        if (empty($template)) {
            return [];
        }

        return array_reduce($this->storage, function ($carry, $context) use ($template) {
            return array_merge($carry ?: [], $context->provide($template));
        });
    }
}