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();
        }
}