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1<?php
2
3declare(strict_types=1);
4
5namespace Phpdftk\Pdf\Core\Document;
6
7use Phpdftk\Pdf\Core\PdfDictionary;
8use Phpdftk\Pdf\Core\PdfName;
9use Phpdftk\Pdf\Core\PdfObject;
10use Phpdftk\Pdf\Core\PdfVersion;
11use Phpdftk\Pdf\Core\RequiresPdfVersion;
12
13/**
14 * PDF Collection Schema dictionary.
15 *
16 * Defines the schema for collection fields in a PDF portfolio.
17 *
18 * Example:
19 *   $schema = new CollectionSchema();
20 *   $schema->fields->set('FileName', $fieldDefDict);
21 */
22#[RequiresPdfVersion(PdfVersion::V1_7)]
23class CollectionSchema extends PdfObject
24{
25    public const PDF_TYPE = 'CollectionSchema';
26
27    public PdfDictionary $fields;
28
29    public function __construct()
30    {
31        $this->fields = new PdfDictionary();
32    }
33
34    public function toPdf(): string
35    {
36        $dict = new PdfDictionary();
37        $dict->set('Type', new PdfName(self::PDF_TYPE));
38
39        // Merge field entries from $this->fields into the dict
40        foreach ($this->fields->entries as $key => $value) {
41            $dict->set($key, $value);
42        }
43
44        return $dict->toPdf();
45    }
46}