SkinFactory.php

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<?php

class SkinFactory {

    private $factoryFunctions = [];
    private $displayNames = [];

    public function register( $name, $displayName, $callback ) {
        if ( !is_callable( $callback ) ) {
            throw new InvalidArgumentException( 'Invalid callback provided' );
        }
        $this->factoryFunctions[$name] = $callback;
        $this->displayNames[$name] = $displayName;
    }

    public function getSkinNames() {
        return $this->displayNames;
    }

    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." );
        }
    }
}