protected function SitemapGenerator::generateSitemapChunk in Simple XML sitemap 8.2

Generates and returns a sitemap chunk.

Parameters

array $links: All links with their multilingual versions and settings.

Return value

string Sitemap chunk

1 call to SitemapGenerator::generateSitemapChunk()

SitemapGenerator::generateSitemap in src/SitemapGenerator.php

Wrapper method which takes links along with their options and then generates and saves the sitemap.

File

src/SitemapGenerator.php, line 199

Class

SitemapGenerator

Class SitemapGenerator @package Drupal\simple_sitemap

Namespace

Drupal\simple_sitemap

Code

protected function generateSitemapChunk(array $links) {
  $this->writer
    ->openMemory();
  $this->writer
    ->setIndent(TRUE);
  $this->writer
    ->startDocument(self::XML_VERSION, self::ENCODING);
  $this->writer
    ->writeComment(self::GENERATED_BY);
  $this->writer
    ->startElement('urlset');

  // Add attributes to document.
  if (!$this
    ->isHreflangSitemap()) {
    unset(self::$attributes['xmlns:xhtml']);
  }
  $this->moduleHandler
    ->alter('simple_sitemap_attributes', self::$attributes);
  foreach (self::$attributes as $name => $value) {
    $this->writer
      ->writeAttribute($name, $value);
  }

  // Add URLs to document.
  $this->moduleHandler
    ->alter('simple_sitemap_links', $links);
  foreach ($links as $link) {

    // Add each translation variant URL as location to the sitemap.
    $this->writer
      ->startElement('url');
    $this->writer
      ->writeElement('loc', $link['url']);

    // If more than one language is enabled, add all translation variant URLs
    // as alternate links to this location turning the sitemap into a hreflang
    // sitemap.
    if (isset($link['alternate_urls']) && $this
      ->isHreflangSitemap()) {
      foreach ($link['alternate_urls'] as $language_id => $alternate_url) {
        $this->writer
          ->startElement('xhtml:link');
        $this->writer
          ->writeAttribute('rel', 'alternate');
        $this->writer
          ->writeAttribute('hreflang', $language_id);
        $this->writer
          ->writeAttribute('href', $alternate_url);
        $this->writer
          ->endElement();
      }
    }

    // Add lastmod if any.
    if (isset($link['lastmod'])) {
      $this->writer
        ->writeElement('lastmod', $link['lastmod']);
    }

    // Add changefreq if any.
    if (isset($link['changefreq'])) {
      $this->writer
        ->writeElement('changefreq', $link['changefreq']);
    }

    // Add priority if any.
    if (isset($link['priority'])) {
      $this->writer
        ->writeElement('priority', $link['priority']);
    }

    // Add images if any.
    if (!empty($link['images'])) {
      foreach ($link['images'] as $image) {
        $this->writer
          ->startElement('image:image');
        $this->writer
          ->writeElement('image:loc', $image['path']);
        $this->writer
          ->endElement();
      }
    }
    $this->writer
      ->endElement();
  }
  $this->writer
    ->endElement();
  $this->writer
    ->endDocument();
  return $this->writer
    ->outputMemory();
}