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Edit File: URIRefKeyword.php

<?php
/* ============================================================================
 * Copyright 2020 Zindex Software
 *
 * 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 Opis\JsonSchema\Keywords;

use Opis\JsonSchema\Errors\ValidationError;
use Opis\JsonSchema\Exceptions\UnresolvedReferenceException;
use Opis\JsonSchema\{Schema, Uri, ValidationContext, Variables};

class URIRefKeyword extends AbstractRefKeyword
{
    protected Uri $uri;
    /** @var bool|null|Schema */
    protected $resolved = false;

public function __construct(
        Uri $uri,
        ?Variables $mapper,
        ?Variables $globals,
        ?array $slots = null,
        string $keyword = '$ref'
    ) {
        parent::__construct($mapper, $globals, $slots, $keyword);
        $this->uri = $uri;
    }

protected function doValidate(ValidationContext $context, Schema $schema): ?ValidationError
    {
        if ($this->resolved === false) {
            $this->resolved = $context->loader()->loadSchemaById($this->uri);
        }

if ($this->resolved === null) {
            throw new UnresolvedReferenceException((string)$this->uri, $schema, $context);
        }

$this->setLastRefSchema($this->resolved);

return $this->resolved->validate($this->createContext($context, $schema));
    }
}