includes/context/DerivativeContext.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @author Daniel Friesen
  19  * @file
  20  */
  21 use Liuggio\StatsdClient\Factory\StatsdDataFactory;
  22 use MediaWiki\MediaWikiServices;
  23
  24 /**
  25  * An IContextSource implementation which will inherit context from another source
  26  * but allow individual pieces of context to be changed locally
  27  * eg: A ContextSource that can inherit from the main RequestContext but have
  28  *     a different Title instance set on it.
  29  * @since 1.19
  30  */
  31 class DerivativeContext extends ContextSource implements MutableContext {
  32         /**
  33          * @var WebRequest
  34          */
  35         private $request;
  36
  37         /**
  38          * @var Title
  39          */
  40         private $title;
  41
  42         /**
  43          * @var WikiPage
  44          */
  45         private $wikipage;
  46
  47         /**
  48          * @var OutputPage
  49          */
  50         private $output;
  51
  52         /**
  53          * @var User
  54          */
  55         private $user;
  56
  57         /**
  58          * @var Language
  59          */
  60         private $lang;
  61
  62         /**
  63          * @var Skin
  64          */
  65         private $skin;
  66
  67         /**
  68          * @var Config
  69          */
  70         private $config;
  71
  72         /**
  73          * @var Timing
  74          */
  75         private $timing;
  76
  77         /**
  78          * Constructor
  79          * @param IContextSource $context Context to inherit from
  80          */
  81         public function __construct( IContextSource $context ) {
  82                 $this->setContext( $context );
  83         }
  84
  85         /**
  86          * Set the SiteConfiguration object
  87          *
  88          * @param Config $s
  89          */
  90         public function setConfig( Config $s ) {
  91                 $this->config = $s;
  92         }
  93
  94         /**
  95          * Get the Config object
  96          *
  97          * @return Config
  98          */
  99         public function getConfig() {
 100                 if ( !is_null( $this->config ) ) {
 101                         return $this->config;
 102                 } else {
 103                         return $this->getContext()->getConfig();
 104                 }
 105         }
 106
 107         /**
 108          * Get the stats object
 109          *
 110          * @deprecated since 1.27 use a StatsdDataFactory from MediaWikiServices (preferably injected)
 111          *
 112          * @return StatsdDataFactory
 113          */
 114         public function getStats() {
 115                 return MediaWikiServices::getInstance()->getStatsdDataFactory();
 116         }
 117
 118         /**
 119          * Get the timing object
 120          *
 121          * @return Timing
 122          */
 123         public function getTiming() {
 124                 if ( !is_null( $this->timing ) ) {
 125                         return $this->timing;
 126                 } else {
 127                         return $this->getContext()->getTiming();
 128                 }
 129         }
 130
 131         /**
 132          * Set the WebRequest object
 133          *
 134          * @param WebRequest $r
 135          */
 136         public function setRequest( WebRequest $r ) {
 137                 $this->request = $r;
 138         }
 139
 140         /**
 141          * Get the WebRequest object
 142          *
 143          * @return WebRequest
 144          */
 145         public function getRequest() {
 146                 if ( !is_null( $this->request ) ) {
 147                         return $this->request;
 148                 } else {
 149                         return $this->getContext()->getRequest();
 150                 }
 151         }
 152
 153         /**
 154          * Set the Title object
 155          *
 156          * @param Title $t
 157          */
 158         public function setTitle( Title $t ) {
 159                 $this->title = $t;
 160         }
 161
 162         /**
 163          * Get the Title object
 164          *
 165          * @return Title|null
 166          */
 167         public function getTitle() {
 168                 if ( !is_null( $this->title ) ) {
 169                         return $this->title;
 170                 } else {
 171                         return $this->getContext()->getTitle();
 172                 }
 173         }
 174
 175         /**
 176          * Check whether a WikiPage object can be get with getWikiPage().
 177          * Callers should expect that an exception is thrown from getWikiPage()
 178          * if this method returns false.
 179          *
 180          * @since 1.19
 181          * @return bool
 182          */
 183         public function canUseWikiPage() {
 184                 if ( $this->wikipage !== null ) {
 185                         return true;
 186                 } elseif ( $this->title !== null ) {
 187                         return $this->title->canExist();
 188                 } else {
 189                         return $this->getContext()->canUseWikiPage();
 190                 }
 191         }
 192
 193         /**
 194          * Set the WikiPage object
 195          *
 196          * @since 1.19
 197          * @param WikiPage $p
 198          */
 199         public function setWikiPage( WikiPage $p ) {
 200                 $this->wikipage = $p;
 201         }
 202
 203         /**
 204          * Get the WikiPage object.
 205          * May throw an exception if there's no Title object set or the Title object
 206          * belongs to a special namespace that doesn't have WikiPage, so use first
 207          * canUseWikiPage() to check whether this method can be called safely.
 208          *
 209          * @since 1.19
 210          * @return WikiPage
 211          */
 212         public function getWikiPage() {
 213                 if ( !is_null( $this->wikipage ) ) {
 214                         return $this->wikipage;
 215                 } else {
 216                         return $this->getContext()->getWikiPage();
 217                 }
 218         }
 219
 220         /**
 221          * Set the OutputPage object
 222          *
 223          * @param OutputPage $o
 224          */
 225         public function setOutput( OutputPage $o ) {
 226                 $this->output = $o;
 227         }
 228
 229         /**
 230          * Get the OutputPage object
 231          *
 232          * @return OutputPage
 233          */
 234         public function getOutput() {
 235                 if ( !is_null( $this->output ) ) {
 236                         return $this->output;
 237                 } else {
 238                         return $this->getContext()->getOutput();
 239                 }
 240         }
 241
 242         /**
 243          * Set the User object
 244          *
 245          * @param User $u
 246          */
 247         public function setUser( User $u ) {
 248                 $this->user = $u;
 249         }
 250
 251         /**
 252          * Get the User object
 253          *
 254          * @return User
 255          */
 256         public function getUser() {
 257                 if ( !is_null( $this->user ) ) {
 258                         return $this->user;
 259                 } else {
 260                         return $this->getContext()->getUser();
 261                 }
 262         }
 263
 264         /**
 265          * Set the Language object
 266          *
 267          * @param Language|string $l Language instance or language code
 268          * @throws MWException
 269          * @since 1.19
 270          */
 271         public function setLanguage( $l ) {
 272                 if ( $l instanceof Language ) {
 273                         $this->lang = $l;
 274                 } elseif ( is_string( $l ) ) {
 275                         $l = RequestContext::sanitizeLangCode( $l );
 276                         $obj = Language::factory( $l );
 277                         $this->lang = $obj;
 278                 } else {
 279                         throw new MWException( __METHOD__ . " was passed an invalid type of data." );
 280                 }
 281         }
 282
 283         /**
 284          * Get the Language object
 285          *
 286          * @return Language
 287          * @since 1.19
 288          */
 289         public function getLanguage() {
 290                 if ( !is_null( $this->lang ) ) {
 291                         return $this->lang;
 292                 } else {
 293                         return $this->getContext()->getLanguage();
 294                 }
 295         }
 296
 297         /**
 298          * Set the Skin object
 299          *
 300          * @param Skin $s
 301          */
 302         public function setSkin( Skin $s ) {
 303                 $this->skin = clone $s;
 304                 $this->skin->setContext( $this );
 305         }
 306
 307         /**
 308          * Get the Skin object
 309          *
 310          * @return Skin
 311          */
 312         public function getSkin() {
 313                 if ( !is_null( $this->skin ) ) {
 314                         return $this->skin;
 315                 } else {
 316                         return $this->getContext()->getSkin();
 317                 }
 318         }
 319
 320         /**
 321          * Get a message using the current context.
 322          *
 323          * This can't just inherit from ContextSource, since then
 324          * it would set only the original context, and not take
 325          * into account any changes.
 326          *
 327          * @param mixed $args,... Arguments to wfMessage
 328          * @return Message
 329          */
 330         public function msg() {
 331                 $args = func_get_args();
 332
 333                 return call_user_func_array( 'wfMessage', $args )->setContext( $this );
 334         }
 335 }