--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/example_addressbook/example_addressbook_backend.php	Thu Jan 04 15:50:29 2018 -0500
@@ -0,0 +1,116 @@
+<?php
+
+/**
+ * Example backend class for a custom address book
+ *
+ * This one just holds a static list of address records
+ *
+ * @author Thomas Bruederli
+ */
+class example_addressbook_backend extends rcube_addressbook
+{
+  public $primary_key = 'ID';
+  public $readonly = true;
+  public $groups = true;
+
+  private $filter;
+  private $result;
+  private $name;
+
+  public function __construct($name)
+  {
+    $this->ready = true;
+    $this->name = $name;
+  }
+
+  public function get_name()
+  {
+    return $this->name;
+  }
+
+  public function set_search_set($filter)
+  {
+    $this->filter = $filter;
+  }
+
+  public function get_search_set()
+  {
+    return $this->filter;
+  }
+
+  public function reset()
+  {
+    $this->result = null;
+    $this->filter = null;
+  }
+
+  function list_groups($search = null, $mode = 0)
+  {
+    return array(
+      array('ID' => 'testgroup1', 'name' => "Testgroup"),
+      array('ID' => 'testgroup2', 'name' => "Sample Group"),
+    );
+  }
+
+  public function list_records($cols=null, $subset=0)
+  {
+    $this->result = $this->count();
+    $this->result->add(array('ID' => '111', 'name' => "Example Contact", 'firstname' => "Example", 'surname' => "Contact", 'email' => "example@roundcube.net"));
+
+    return $this->result;
+  }
+
+  public function search($fields, $value, $strict=false, $select=true, $nocount=false, $required=array())
+  {
+    // no search implemented, just list all records
+    return $this->list_records();
+  }
+
+  public function count()
+  {
+    return new rcube_result_set(1, ($this->list_page-1) * $this->page_size);
+  }
+
+  public function get_result()
+  {
+    return $this->result;
+  }
+
+  public function get_record($id, $assoc=false)
+  {
+    $this->list_records();
+    $first = $this->result->first();
+    $sql_arr = $first['ID'] == $id ? $first : null;
+
+    return $assoc && $sql_arr ? $sql_arr : $this->result;
+  }
+
+
+  function create_group($name)
+  {
+    $result = false;
+
+    return $result;
+  }
+
+  function delete_group($gid)
+  {
+    return false;
+  }
+
+  function rename_group($gid, $newname, &$newid)
+  {
+    return $newname;
+  }
+
+  function add_to_group($group_id, $ids)
+  {
+    return false;
+  }
+
+  function remove_from_group($group_id, $ids)
+  {
+     return false;
+  }
+
+}