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<?php
/**
 * Copyright 2012-2014 Rackspace US, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace OpenCloud\Common\Service;

use OpenCloud\Common\Exceptions\InvalidArgumentError;

/**
 * This object represents the service catalog returned by the Rackspace API. It contains all the services available
 * to the end-user, including specific information for each service.
 */
class Catalog
{
    /**
     * @var array Service items
     */
    private $items = array();

    /**
     * Produces a Catalog from a mixed input.
     *
     * @param  $config
     * @return Catalog
     * @throws \OpenCloud\Common\Exceptions\InvalidArgumentError
     */
    public static function factory($config)
    {
        if (is_array($config)) {
            $catalog = new self();
            foreach ($config as $item) {
                $catalog->items[] = CatalogItem::factory($item);
            }
        } elseif ($config instanceof Catalog) {
            $catalog = $config;
        } else {
            throw new InvalidArgumentError(sprintf(
                'Argument for Catalog::factory must be either an array or an '
                . 'instance of %s. You passed in: %s',
                get_class(),
                print_r($config, true)
            ));
        }

        return $catalog;
    }

    /**
     * @return array
     */
    public function getItems()
    {
        return $this->items;
    }
}