ContextSource.php

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<?php
abstract class ContextSource implements IContextSource {
    private $context;

    public function getContext() {
        if ( $this->context === null ) {
            $class = get_class( $this );
            wfDebug( __METHOD__ . " ($class): called and \$context is null. Using RequestContext::getMain() for sanity\n" );
            $this->context = RequestContext::getMain();
        }
        return $this->context;
    }

    public function setContext( IContextSource $context ) {
        $this->context = $context;
    }

    public function getRequest() {
        return $this->getContext()->getRequest();
    }

    public function getTitle() {
        return $this->getContext()->getTitle();
    }

    public function canUseWikiPage() {
        return $this->getContext()->canUseWikiPage();
    }

    public function getWikiPage() {
        return $this->getContext()->getWikiPage();
    }

    public function getOutput() {
        return $this->getContext()->getOutput();
    }

    public function getUser() {
        return $this->getContext()->getUser();
    }

    public function getLang() {
        wfDeprecated( __METHOD__, '1.19' );
        return $this->getLanguage();
    }

    public function getLanguage() {
        return $this->getContext()->getLanguage();
    }

    public function getSkin() {
        return $this->getContext()->getSkin();
    }

    public function msg( /* $args */ ) {
        $args = func_get_args();
        return call_user_func_array( array( $this->getContext(), 'msg' ), $args );
    }

    public function exportSession() {
        return $this->getContext()->exportSession();
    }
}