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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Pdf\Core; |
| 6 | |
| 7 | /** |
| 8 | * Base class for PDF objects that live as indirect objects (`X Y obj ... endobj`). |
| 9 | * |
| 10 | * Every PdfObject gets an object number assigned by {@see File\ObjectRegistry} |
| 11 | * when registered with a writer. Unlike plain {@see Serializable} types |
| 12 | * (which serialize inline), PdfObjects can be referenced from anywhere in |
| 13 | * the document via {@see PdfReference}. |
| 14 | */ |
| 15 | abstract class PdfObject implements Serializable |
| 16 | { |
| 17 | public int $objectNumber = 0; |
| 18 | public int $generationNumber = 0; |
| 19 | |
| 20 | /** |
| 21 | * Serialize the object's dictionary/value to PDF syntax. |
| 22 | */ |
| 23 | abstract public function toPdf(): string; |
| 24 | |
| 25 | /** |
| 26 | * Wrap the object in an indirect object structure: |
| 27 | * X Y obj |
| 28 | * ... |
| 29 | * endobj |
| 30 | */ |
| 31 | public function toIndirectObject(): string |
| 32 | { |
| 33 | return sprintf( |
| 34 | "%d %d obj\n%s\nendobj", |
| 35 | $this->objectNumber, |
| 36 | $this->generationNumber, |
| 37 | $this->toPdf(), |
| 38 | ); |
| 39 | } |
| 40 | } |