public function PDFPreviewGenerator::getPDFPreview in PDFPreview 8

Same name and namespace in other branches

1. 2.0.x src/PdfPreviewGenerator.php \Drupal\pdfpreview\PdfPreviewGenerator::getPdfPreview()

Gets the preview image if it exists, or creates it if it doesnt.

Parameters

\Drupal\file\Entity\File $file: The file to generate a preview for.

File

src/PDFPreviewGenerator.php, line 80

Class

PDFPreviewGenerator

Generates PDF Previews.

Namespace

Drupal\pdfpreview

Code

public function getPDFPreview(File $file) {
  $destination_uri = $this
    ->getDestinationURI($file);

  // Check if a preview already exists.
  if (file_exists($destination_uri)) {

    // Check if the existing preview is older than the file itself.
    if (filemtime($file
      ->getFileUri()) <= filemtime($destination_uri)) {

      // The existing preview can be used, nothing to do.
      return $destination_uri;
    }
    else {

      // Delete the existing but out-of-date preview.
      $this
        ->deletePDFPreview($file);
    }
  }
  if ($this
    ->createPDFPreview($file, $destination_uri)) {
    return $destination_uri;
  }
}