<?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\Exclusion;

use JMS\Serializer\Context;
use JMS\Serializer\Metadata\PropertyMetadata;
use JMS\Serializer\SerializationContext;
use JMS\Serializer\Expression\ExpressionEvaluatorInterface;

/**
 * Exposes an exclusion strategy based on the Symfony's expression language.
 * This is not a standard exclusion strategy and can not be used in user applications.
 *
 * @internal
 *
 * @author Asmir Mustafic <goetas@gmail.com>
 */
class ExpressionLanguageExclusionStrategy
{
    /**
     * @var ExpressionEvaluatorInterface
     */
    private $expressionEvaluator;

    public function __construct(ExpressionEvaluatorInterface $expressionEvaluator)
    {
        $this->expressionEvaluator = $expressionEvaluator;
    }

    /**
     * {@inheritDoc}
     */
    public function shouldSkipProperty(PropertyMetadata $property, Context $navigatorContext)
    {
        if (null === $property->excludeIf) {
            return false;
        }

        $variables = [
            'context' => $navigatorContext,
        ];
        if ($navigatorContext instanceof SerializationContext) {
            $variables['object'] = $navigatorContext->getObject();
        }

        return $this->expressionEvaluator->evaluate($property->excludeIf, $variables);
    }
}