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File: MetadataPlugin.inc.php
<?php

/**
 * @file classes/plugins/MetadataPlugin.inc.php
 *
 * Copyright (c) 2014-2021 Simon Fraser University
 * Copyright (c) 2003-2021 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @class MetadataPlugin
 * @ingroup plugins
 *
 * @brief Abstract class for metadata plugins
 */


import('lib.pkp.classes.plugins.Plugin');

// Define the well-known file name for controlled vocabulary data.
define('METADATA_PLUGIN_VOCAB_DATAFILE', 'controlledVocabs.xml');

abstract class MetadataPlugin extends Plugin {

	//
	// Override public methods from Plugin
	//
	/**
	 * @copydoc Plugin::register()
	 */
	function register($category, $path, $mainContextId = null) {
		if (!parent::register($category, $path, $mainContextId)) return false;
		$this->addLocaleData();
		return true;
	}

	/**
	 * This implementation looks for files that contain controlled
	 * vocabulary data. It can discover and return more than one file.
	 * @see Plugin::getInstallControlledVocabFiles()
	 * @return array|null
	 */
	function getInstallControlledVocabFiles() {
		// Search the well-known locations for vocabulary data files. If
		// one is found then return it.
		$pluginPath = $this->getPluginPath();
		$wellKnownVocabLocations = array(
			'./'.$pluginPath.'/schema/'.METADATA_PLUGIN_VOCAB_DATAFILE,
			'./lib/pkp/'.$pluginPath.'/schema/'.METADATA_PLUGIN_VOCAB_DATAFILE
		);

		$controlledVocabFiles = parent::getInstallControlledVocabFiles();
		foreach ($wellKnownVocabLocations as $wellKnownVocabLocation) {
			if (file_exists($wellKnownVocabLocation)) $controlledVocabFiles[] = $wellKnownVocabLocation;
		}
		return $controlledVocabFiles;
	}

	/**
	 * Get a unique id for this metadata format
	 *
	 * @param $format string The format to check for support.
	 * @return string
	 */
	abstract function supportsFormat($format);

	/**
	 * Instantiate and return the schema object for this metadata format
	 *
	 * @param $format string The format to return the schema object for in case
	 *  the plugin supports multiple formats.
	 * @return mixed
	 */
	abstract function getSchemaObject($format);
}