<?php
/**
 * A TaskHandlerInitializer filter for crawler
 *
 * @author		Roland Haeder <webmaster@shipsimu.org>
 * @version		0.0.0
 * @copyright	Copyright (c) 2014 Crawler Developer Team
 * @license		GNU GPL 3.0 or any newer version
 * @link		http://www.shipsimu.org
 *
 * 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 <http://www.gnu.org/licenses/>.
 */
class CrawlerTaskHandlerInitializerFilter extends BaseCrawlerFilter implements Filterable {
	/**
	 * Protected constructor
	 *
	 * @return	void
	 */
	protected function __construct () {
		// Call parent constructor
		parent::__construct(__CLASS__);
	}

	/**
	 * Creates an instance of this filter class
	 *
	 * @return	$filterInstance		An instance of this filter class
	 */
	public static final function createCrawlerTaskHandlerInitializerFilter () {
		// Get a new instance
		$filterInstance = new CrawlerTaskHandlerInitializerFilter();

		// Return the instance
		return $filterInstance;
	}

	/**
	 * Executes the filter with given request and response objects
	 *
	 * @param	$requestInstance	An instance of a class with an Requestable interface
	 * @param	$responseInstance	An instance of a class with an Responseable interface
	 * @return	void
	 * @throws	FilterChainException	If the filter chain needs to be interrupted
	 * @todo	10% done
	 */
	public function execute (Requestable $requestInstance, Responseable $responseInstance) {
		// Get crawler instance
		//$crawlerInstance = Registry::getRegistry()->getInstance('crawler');

		// Get a new task handler instance
		$handlerInstance = ObjectFactory::createObjectByConfiguredName('task_handler_class');

		// Put the task handler in registry
		Registry::getRegistry()->addInstance('task_handler', $handlerInstance);

		/*
		 * Register all tasks:
		 *
		 * 1) "Communicator" for crawler->node communication
		 */
		$taskInstance = ObjectFactory::createObjectByConfiguredName('crawler_node_communicator_task_class');
		$handlerInstance->registerTask('crawler_node_communicator', $taskInstance);

		// 2) Local URL crawler (gets URLs locally and adds them to the analyzer's input stack)
		$taskInstance = ObjectFactory::createObjectByConfiguredName('crawler_local_url_crawler_task_class');
		$handlerInstance->registerTask('crawler_local_url_crawler', $taskInstance);

		// 3) Remote URL crawler (gets URLs locally for other nodes, also includes the crawled URL in local index)
		$taskInstance = ObjectFactory::createObjectByConfiguredName('crawler_remote_url_crawler_task_class');
		$handlerInstance->registerTask('crawler_remote_url_crawler', $taskInstance);

		// 4) Remote-crawl publisher (publishes crawl jobs for remote retrieval)
		$taskInstance = ObjectFactory::createObjectByConfiguredName('crawler_remote_job_publisher_task_class');
		$handlerInstance->registerTask('crawler_remote_job_publisher', $taskInstance);

		// 5) MIME sniffer
		$taskInstance = ObjectFactory::createObjectByConfiguredName('crawler_mime_sniffer_task_class');
		$handlerInstance->registerTask('crawler_mime_sniffer', $taskInstance);

		// 6) Document parser (converts document to meta format)
		$taskInstance = ObjectFactory::createObjectByConfiguredName('crawler_document_parser_task_class');
		$handlerInstance->registerTask('crawler_document_parser', $taskInstance);

		// 7) Document structure analyzer
		$taskInstance = ObjectFactory::createObjectByConfiguredName('crawler_structure_analyzer_task_class');
		$handlerInstance->registerTask('crawler_structure_analyzer', $taskInstance);

		// 8) Snippet extractor
		$taskInstance = ObjectFactory::createObjectByConfiguredName('crawler_snippet_extractor_task_class');
		$handlerInstance->registerTask('crawler_snippet_extractor', $taskInstance);

		// 9) Node ping
		$taskInstance = ObjectFactory::createObjectByConfiguredName('crawler_ping_task_class');
		$handlerInstance->registerTask('crawler_ping', $taskInstance);

		// 10) URL sources
		foreach (explode(':', $this->getConfigInstance()->getConfigEntry('crawler_url_stacks')) as $stack) {
			// Init task instance
			$taskInstance = ObjectFactory::createObjectByConfiguredName('crawler_url_source_' . $stack . '_task_class');

			// And register it
			$handlerInstance->registerTask('crawler_url_source_' . $stack, $taskInstance);
		} // END - foreach

		// 11) Uploaded list scanner (checks for wanted files)
		$taskInstance = ObjectFactory::createObjectByConfiguredName('crawler_uploaded_list_scanner_task_class');
		$handlerInstance->registerTask('crawler_uploaded_list_scanner', $taskInstance);
	}
}

// [EOF]
?>