DerivativeContext.php

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<?php
class DerivativeContext extends ContextSource {

        private $request;

        private $title;

        private $wikipage;

        private $output;

        private $user;

        private $lang;

        private $skin;

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

        public function setRequest( WebRequest $r ) {
                $this->request = $r;
        }

        public function getRequest() {
                if ( !is_null( $this->request ) ) {
                        return $this->request;
                } else {
                        return $this->getContext()->getRequest();
                }
        }

        public function setTitle( Title $t ) {
                $this->title = $t;
        }

        public function getTitle() {
                if ( !is_null( $this->title ) ) {
                        return $this->title;
                } else {
                        return $this->getContext()->getTitle();
                }
        }

        public function canUseWikiPage() {
                if ( $this->wikipage !== null ) {
                        return true;
                } elseif ( $this->title !== null ) {
                        return $this->title->canExist();
                } else {
                        return $this->getContext()->canUseWikiPage();
                }
        }

        public function setWikiPage( WikiPage $p ) {
                $this->wikipage = $p;
        }

        public function getWikiPage() {
                if ( !is_null( $this->wikipage ) ) {
                        return $this->wikipage;
                } else {
                        return $this->getContext()->getWikiPage();
                }
        }

        public function setOutput( OutputPage $o ) {
                $this->output = $o;
        }

        public function getOutput() {
                if ( !is_null( $this->output ) ) {
                        return $this->output;
                } else {
                        return $this->getContext()->getOutput();
                }
        }

        public function setUser( User $u ) {
                $this->user = $u;
        }

        public function getUser() {
                if ( !is_null( $this->user ) ) {
                        return $this->user;
                } else {
                        return $this->getContext()->getUser();
                }
        }

        public function setLang( $l ) {
                wfDeprecated( __METHOD__, '1.19' );
                $this->setLanguage( $l );
        }

        public function setLanguage( $l ) {
                if ( $l instanceof Language ) {
                        $this->lang = $l;
                } elseif ( is_string( $l ) ) {
                        $l = RequestContext::sanitizeLangCode( $l );
                        $obj = Language::factory( $l );
                        $this->lang = $obj;
                } else {
                        throw new MWException( __METHOD__ . " was passed an invalid type of data." );
                }
        }

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

        public function getLanguage() {
                if ( !is_null( $this->lang ) ) {
                        return $this->lang;
                } else {
                        return $this->getContext()->getLanguage();
                }
        }

        public function setSkin( Skin $s ) {
                $this->skin = clone $s;
                $this->skin->setContext( $this );
        }

        public function getSkin() {
                if ( !is_null( $this->skin ) ) {
                        return $this->skin;
                } else {
                        return $this->getContext()->getSkin();
                }
        }

}