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File: GatewayPlugin.inc.php
<?php

/**
 * @file classes/plugins/GatewayPlugin.inc.php
 *
 * Copyright (c) 2013-2019 Simon Fraser University
 * Copyright (c) 2003-2019 John Willinsky
 * Distributed under the GNU GPL v2. For full terms see the file docs/COPYING.
 *
 * @class GatewayPlugin
 * @ingroup plugins
 *
 * @brief Abstract class for gateway plugins
 */

import('classes.plugins.Plugin');

class GatewayPlugin extends Plugin {
	function GatewayPlugin() {
		parent::Plugin();
	}

	/**
	 * Get the name of this plugin. The name must be unique within
	 * its category.
	 * @return String name of plugin
	 */
	function getName() {
		assert(false); // Should always be overridden
	}

	/**
	 * Get the display name of this plugin. This name is displayed on the
	 * Journal Manager's plugin management page, for example.
	 * @return String
	 */
	function getDisplayName() {
		// This name should never be displayed because child classes
		// will override this method.
		return 'Abstract Gateway Plugin';
	}

	/**
	 * Get a description of the plugin.
	 */
	function getDescription() {
		return 'This is the GatewayPlugin base class. Its functions can be overridden by subclasses to provide import/export functionality for various formats.';
	}

	/**
	 * Display verbs for the management interface.
	 */
	function getManagementVerbs() {
		$verbs = array();
		if ($this->getEnabled()) {
			$verbs[] = array(
				'disable',
				__('manager.plugins.disable')
			);
		} else {
			$verbs[] = array(
				'enable',
				__('manager.plugins.enable')
			);
		}
		return $verbs;
	}

	/**
	 * Determine whether or not this plugin is enabled.
	 */
	function getEnabled() {
		$journal =& Request::getJournal();
		if (!$journal) return false;
		return $this->getSetting($journal->getId(), 'enabled');
	}

	/**
	 * Set the enabled/disabled state of this plugin
	 */
	function setEnabled($enabled) {
		$journal =& Request::getJournal();
		if ($journal) {
			$this->updateSetting(
				$journal->getId(),
				'enabled',
				$enabled?true:false
			);
			return true;
		}
		return false;
	}

	/**
	 * Perform management functions
	 */
	function manage($verb, $args) {
		$templateManager =& TemplateManager::getManager();
		$templateManager->register_function('plugin_url', array(&$this, 'smartyPluginUrl'));
		switch ($verb) {
			case 'enable': $this->setEnabled(true); break;
			case 'disable': $this->setEnabled(false); break;
		}
		return false;
	}

	/**
	 * Handle fetch requests for this plugin.
	 * @param $args array
	 * @param $request object
	 */
	function fetch($args, $request) {
		// Subclasses should override this function.
		return false;
	}
}
?>