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<?php
/**
* Copyright 2014
*
* 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
*/
/**
* Factory class to create Skin objects
*
* @since 1.24
*/
class SkinFactory {
/**
* Map of name => callback
* @var array
*/
private $factoryFunctions = array();
/**
* Map of name => fallback human-readable name, used when the 'skinname-<skin>' message is not
* available
*
* @var array
*/
private $displayNames = array();
/**
* @var SkinFactory
*/
private static $self;
public static function getDefaultInstance() {
if ( !self::$self ) {
self::$self = new self;
}
return self::$self;
}
/**
* Register a new Skin factory function.
*
* Will override if it's already registered.
*
* @param string $name Internal skin name. Should be all-lowercase (technically doesn't have
* to be, but doing so would change the case of i18n message keys).
* @param string $displayName For backwards-compatibility with old skin loading system. This is
* the text used as skin's human-readable name when the 'skinname-<skin>' message is not
* available. It should be the same as the skin name provided in $wgExtensionCredits.
* @param callable $callback Callback that takes the skin name as an argument
* @throws InvalidArgumentException If an invalid callback is provided
*/
public function register( $name, $displayName, $callback ) {
if ( !is_callable( $callback ) ) {
throw new InvalidArgumentException( 'Invalid callback provided' );
}
$this->factoryFunctions[$name] = $callback;
$this->displayNames[$name] = $displayName;
}
/**
* Returns an associative array of:
* skin name => human readable name
*
* @return array
*/
public function getSkinNames() {
return $this->displayNames;
}
/**
* Create a given Skin using the registered callback for $name.
* @param string $name Name of the skin you want
* @throws SkinException If a factory function isn't registered for $name
* @throws UnexpectedValueException If the factory function returns a non-Skin object
* @return Skin
*/
public function makeSkin( $name ) {
if ( !isset( $this->factoryFunctions[$name] ) ) {
throw new SkinException( "No registered builder available for $name." );
}
$skin = call_user_func( $this->factoryFunctions[$name], $name );
if ( $skin instanceof Skin ) {
return $skin;
} else {
throw new UnexpectedValueException( "The builder for $name returned a non-Skin object." );
}
}
}
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