Current File : /home/jvzmxxx/wiki1/extensions/Wikibase/repo/includes/Actions/HistoryEntityAction.php

<?php

namespace Wikibase;

use HistoryAction;
use MWContentSerializationException;
use Wikibase\Repo\WikibaseRepo;

/**
 * Handles the history action for Wikibase entities.
 *
 * @since 0.3
 *
 * @license GPL-2.0+
 * @author John Erling Blad < jeblad@gmail.com >
 */
class HistoryEntityAction extends HistoryAction {

	/**
	 * @var LanguageFallbackChain
	 */
	protected $languageFallbackChain;

	/**
	 * Get the language fallback chain for current context.
	 *
	 * @since 0.4
	 *
	 * @return LanguageFallbackChain
	 */
	public function getLanguageFallbackChain() {
		if ( $this->languageFallbackChain === null ) {
			$this->languageFallbackChain = WikibaseRepo::getDefaultInstance()->getLanguageFallbackChainFactory()
				->newFromContext( $this->getContext() );
		}

		return $this->languageFallbackChain;
	}

	/**
	 * Set language fallback chain.
	 *
	 * @since 0.4
	 *
	 * @param LanguageFallbackChain $chain
	 */
	public function setLanguageFallbackChain( LanguageFallbackChain $chain ) {
		$this->languageFallbackChain = $chain;
	}

	/**
	 * Returns the content of the page being viewed.
	 *
	 * @return EntityContent|null
	 */
	protected function getContent() {
		try {
			return $this->getArticle()->getPage()->getContent();
		} catch ( MWContentSerializationException $ex ) {
			return null;
		}
	}

	/**
	 * Return a string for use as title.
	 *
	 * @return string
	 */
	protected function getPageTitle() {
		$content = $this->getContent();

		if ( !$content ) {
			// Page does not exist or the entity or redirect can not be deserialized.
			return parent::getPageTitle();
		}

		if ( $content->isRedirect() ) {
			//TODO: use a message like <autoredircomment> to represent the redirect.
			return parent::getPageTitle();
		}

		$entity = $content->getEntity();

		$languageFallbackChain = $this->getLanguageFallbackChain();
		$labels = $entity->getFingerprint()->getLabels()->toTextArray();
		$labelData = $languageFallbackChain->extractPreferredValueOrAny( $labels );

		if ( $labelData ) {
			$labelText = $labelData['value'];
		} else {
			$labelText = null;
		}

		$idSerialization = $entity->getId()->getSerialization();

		if ( isset( $labelText ) ) {
			// Escaping HTML characters in order to retain original label that may contain HTML
			// characters. This prevents having characters evaluated or stripped via
			// OutputPage::setPageTitle:
			return $this->msg( 'wikibase-history-title-with-label' )
				->rawParams( $idSerialization, htmlspecialchars( $labelText ) )->text();
		} else {
			return $this->msg( 'wikibase-history-title-without-label' )
				->rawParams( $idSerialization )->text();
		}
	}

}