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diff --git a/web/modules/contrib/drupalmoduleupgrader/src/Routing/LinkBinding/LinkBinding.php b/web/modules/contrib/drupalmoduleupgrader/src/Routing/LinkBinding/LinkBinding.php
new file mode 100644
index 000000000..217d8d7a5
--- /dev/null
+++ b/web/modules/contrib/drupalmoduleupgrader/src/Routing/LinkBinding/LinkBinding.php
@@ -0,0 +1,107 @@
+<?php
+
+namespace Drupal\drupalmoduleupgrader\Routing\LinkBinding;
+
+use Drupal\drupalmoduleupgrader\Routing\Drupal7\RouteWrapper as Drupal7Route;
+use Drupal\drupalmoduleupgrader\Routing\Drupal8\RouteWrapper as Drupal8Route;
+use Drupal\drupalmoduleupgrader\Routing\LinkIndex;
+
+/**
+ * Represents a binding between a Drupal 7 route and a Drupal 8 one.
+ */
+class LinkBinding {
+
+  /**
+   * @var \Drupal\drupalmoduleupgrader\Routing\Drupal7\RouteWrapper
+   */
+  protected $source;
+
+  /**
+   * @var \Drupal\drupalmoduleupgrader\Routing\Drupal8\RouteWrapper
+   */
+  protected $destination;
+
+  /**
+   * The link ID.
+   *
+   * @var string
+   */
+  protected $id;
+
+  /**
+   * Index of all other links of this type.
+   *
+   * @var LinkIndex
+   */
+  protected $index;
+
+  /**
+   * Constructs a LinkBinding object.
+   */
+  public function __construct(Drupal7Route $source, Drupal8Route $destination) {
+    $this->source = $source;
+    $this->destination = $destination;
+  }
+
+  /**
+   * Returns the Drupal 7 route in this binding.
+   *
+   * @return \Drupal\drupalmoduleupgrader\Routing\Drupal7\RouteWrapper
+   */
+  public function getSource() {
+    return $this->source;
+  }
+
+  /**
+   * Returns the Drupal 8 route in this binding.
+   *
+   * @return Drupal7Route
+   */
+  public function getDestination() {
+    return $this->destination;
+  }
+
+  /**
+   * Returns the link's plugin ID.
+   *
+   * @return string
+   */
+  public function getIdentifier() {
+    return $this->id ?: $this->getDestination()->getIdentifier();
+  }
+
+  /**
+   * React when the binding is added to an index.
+   *
+   * @param string $id
+   *  The link's plugin ID, sanitized to prevent collisions.
+   * @param LinkIndex $index
+   *  The link index.
+   */
+  public function onIndexed($id, LinkIndex $index) {
+    $this->id = $id;
+    $this->index = $index;
+  }
+
+  /**
+   * Builds the link definition.
+   *
+   * @return array
+   */
+  public function build() {
+    $link = [
+      'route_name' => $this->getDestination()->getIdentifier(),
+    ];
+
+    $source = $this->getSource();
+    if ($source->containsKey('title')) {
+      $link['title'] = $source['title'];
+    }
+    if ($source->containsKey('weight')) {
+      $link['weight'] = $source['weight'];
+    }
+
+    return $link;
+  }
+
+}