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Edit File: MinLengthKeyword.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\{
    ValidationContext,
    Keyword,
    Schema
};
use Opis\JsonSchema\Errors\ValidationError;

class MinLengthKeyword implements Keyword
{
    use ErrorTrait;

protected int $length;

/**
     * @param int $length
     */
    public function __construct(int $length)
    {
        $this->length = $length;
    }

/**
     * @inheritDoc
     */
    public function validate(ValidationContext $context, Schema $schema): ?ValidationError
    {
        if ($this->length === 0) {
            return null;
        }

$length = $context->getStringLength();

if ($length >= $this->length) {
            return null;
        }

return $this->error($schema, $context, 'minLength', "Minimum string length is {min}, found {length}", [
            'min' => $this->length,
            'length' => $length,
        ]);
    }
}