Custom groups exclusion strategy with strict option

CustomGroupsExclusionStrategy

<?php

namespace AppBundle\Serializer\Exclusion;

use JMS\Serializer\Context;
use JMS\Serializer\Exclusion\GroupsExclusionStrategy;
use JMS\Serializer\Metadata\PropertyMetadata;

class CustomGroupsExclusionStrategy extends GroupsExclusionStrategy
{
    private $groups = array();
    private $strict;

    public function __construct(array $groups, $strict = false)
    {
        if (empty($groups)) {
            $groups = array(self::DEFAULT_GROUP);
        }

        $this->groups = $groups;
        $this->strict = $strict;
    }

    /**
     * {@inheritDoc}
     */
    public function shouldSkipProperty(PropertyMetadata $property, Context $navigatorContext)
    {
        $groups = $this->getGroupsFor($navigatorContext);

        if (!$property->groups) {
            return !in_array(self::DEFAULT_GROUP, $groups);
        }

        return $this->strict
            ? $this->shouldSkipUsingStrictGroups($property, $groups)
            : $this->shouldSkipUsingGroups($property, $groups);
    }

    private function shouldSkipUsingGroups(PropertyMetadata $property, $groups)
    {
        foreach ($property->groups as $group) {
            if (in_array($group, $groups)) {
                return false;
            }
        }

        return true;
    }

    private function shouldSkipUsingStrictGroups(PropertyMetadata $property, $groups)
    {
        foreach ($groups as $group) {
            if (!in_array($group, $property->groups)) {
                return true;
            }
        }

        return false;
    }

    private function getGroupsFor(Context $navigatorContext)
    {
        $paths = $navigatorContext->getCurrentPath();

        $groups = $this->groups;
        foreach ($paths as $index => $path) {
            if (!array_key_exists($path, $groups)) {
                if ($index > 0) {
                    $groups = array('Default');
                }

                break;
            }

            $groups = $groups[$path];
        }

        return $groups;
    }
}