<?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\{
Helper,
ValidationContext,
Keyword,
Schema
};
use Opis\JsonSchema\Errors\ValidationError;
class UniqueItemsKeyword implements Keyword
{
use ErrorTrait;
/**
* @inheritDoc
*/
public function validate(ValidationContext $context, Schema $schema): ?ValidationError
{
$data = $context->currentData();
if (!$data) {
return null;
}
$count = count($data);
for ($i = 0; $i < $count - 1; $i++) {
for ($j = $i + 1; $j < $count; $j++) {
if (Helper::equals($data[$i], $data[$j])) {
return $this->error($schema, $context, 'uniqueItems', 'Array must have unique items', [
'duplicate' => $data[$i],
'indexes' => [$i, $j],
]);
}
}
}
return null;
}
}