<?php

/*
 * Copyright 2016 Johannes M. Schmitt <schmittjoh@gmail.com>
 *
 * 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 JMS\Serializer;

interface NullAwareVisitorInterface extends VisitorInterface
{
    /**
     * Determine if a value conveys a null value.
     * An example could be an xml element (Dom, SimpleXml, ...) that is tagged with a xsi:nil attribute
     *
     * @param mixed $value
     *
     * @return bool
     */
    public function isNull($value);
}
