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<?php declare(strict_types = 1);
/*
 * Copyright (c) 2020, Josef Kufner  <josef@kufner.cz>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
namespace Smalldb\StateMachine\StyleExtension\Definition;
use Smalldb\StateMachine\Definition\Builder\ExtensionPlaceholderInterface;
class StyleExtensionPlaceholder implements ExtensionPlaceholderInterface
{
    public ?string $color = null;
    public function __construct()
    {
    }
    public function buildExtension(): ?StyleExtension
    {
        if ($this->color !== null) {
            return new StyleExtension($this->color);
        } else {
            return null;
        }
    }
}