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<?php
/**
* Delayed loading of global objects.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* Class to implement stub globals, which are globals that delay loading the
* their associated module code by deferring initialisation until the first
* method call.
*
* Note on reference parameters:
*
* If the called method takes any parameters by reference, the __call magic
* here won't work correctly. The solution is to unstub the object before
* calling the method.
*
* Note on unstub loops:
*
* Unstub loops (infinite recursion) sometimes occur when a constructor calls
* another function, and the other function calls some method of the stub. The
* best way to avoid this is to make constructors as lightweight as possible,
* deferring any initialisation which depends on other modules. As a last
* resort, you can use StubObject::isRealObject() to break the loop, but as a
* general rule, the stub object mechanism should be transparent, and code
* which refers to it should be kept to a minimum.
*/
class StubObject {
var $mGlobal, $mClass, $mParams;
/**
* Constructor.
*
* @param string $global name of the global variable.
* @param string $class name of the class of the real object.
* @param array $params parameters to pass to constructor of the real
* object.
*/
function __construct( $global = null, $class = null, $params = array() ) {
$this->mGlobal = $global;
$this->mClass = $class;
$this->mParams = $params;
}
/**
* Returns a bool value whenever $obj is a stub object. Can be used to break
* a infinite loop when unstubbing an object.
*
* @param $obj Object to check.
* @return Boolean: true if $obj is not an instance of StubObject class.
*/
static function isRealObject( $obj ) {
return is_object( $obj ) && !$obj instanceof StubObject;
}
/**
* Unstubs an object, if it is a stub object. Can be used to break a
* infinite loop when unstubbing an object or to avoid reference parameter
* breakage.
*
* @param $obj Object to check.
* @return void
*/
static function unstub( $obj ) {
if ( $obj instanceof StubObject ) {
$obj->_unstub( 'unstub', 3 );
}
}
/**
* Function called if any function exists with that name in this object.
* It is used to unstub the object. Only used internally, PHP will call
* self::__call() function and that function will call this function.
* This function will also call the function with the same name in the real
* object.
*
* @param string $name name of the function called
* @param array $args arguments
* @return mixed
*/
function _call( $name, $args ) {
$this->_unstub( $name, 5 );
return call_user_func_array( array( $GLOBALS[$this->mGlobal], $name ), $args );
}
/**
* Create a new object to replace this stub object.
* @return object
*/
function _newObject() {
return MWFunction::newObj( $this->mClass, $this->mParams );
}
/**
* Function called by PHP if no function with that name exists in this
* object.
*
* @param string $name name of the function called
* @param array $args arguments
* @return mixed
*/
function __call( $name, $args ) {
return $this->_call( $name, $args );
}
/**
* This function creates a new object of the real class and replace it in
* the global variable.
* This is public, for the convenience of external callers wishing to access
* properties, e.g. eval.php
*
* @param string $name name of the method called in this object.
* @param $level Integer: level to go in the stack trace to get the function
* who called this function.
* @throws MWException
*/
function _unstub( $name = '_unstub', $level = 2 ) {
static $recursionLevel = 0;
if ( !$GLOBALS[$this->mGlobal] instanceof StubObject ) {
return $GLOBALS[$this->mGlobal]; // already unstubbed.
}
if ( get_class( $GLOBALS[$this->mGlobal] ) != $this->mClass ) {
$fname = __METHOD__ . '-' . $this->mGlobal;
wfProfileIn( $fname );
$caller = wfGetCaller( $level );
if ( ++$recursionLevel > 2 ) {
wfProfileOut( $fname );
throw new MWException( "Unstub loop detected on call of \${$this->mGlobal}->$name from $caller\n" );
}
wfDebug( "Unstubbing \${$this->mGlobal} on call of \${$this->mGlobal}::$name from $caller\n" );
$GLOBALS[$this->mGlobal] = $this->_newObject();
--$recursionLevel;
wfProfileOut( $fname );
}
}
}
/**
* Stub object for the content language of this wiki. This object have to be in
* $wgContLang global.
*
* @deprecated since 1.18
*/
class StubContLang extends StubObject {
function __construct() {
wfDeprecated( __CLASS__, '1.18' );
parent::__construct( 'wgContLang' );
}
function __call( $name, $args ) {
return $this->_call( $name, $args );
}
/**
* @return Language
*/
function _newObject() {
global $wgLanguageCode;
$obj = Language::factory( $wgLanguageCode );
$obj->initEncoding();
$obj->initContLang();
return $obj;
}
}
/**
* Stub object for the user language. It depends of the user preferences and
* "uselang" parameter that can be passed to index.php. This object have to be
* in $wgLang global.
*/
class StubUserLang extends StubObject {
function __construct() {
parent::__construct( 'wgLang' );
}
function __call( $name, $args ) {
return $this->_call( $name, $args );
}
/**
* @return Language
*/
function _newObject() {
return RequestContext::getMain()->getLanguage();
}
}
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