New get_nextid() method

This is useful for generating artificial database records ids.

backup/converter/moodle1/lib.php

@@ -455,6 +455,16 @@ class moodle1_converter extends base_converter {
         }
     }
 
+    /**
+     * Simple autoincrement generator
+     *
+     * @return int the next number in a row of numbers
+     */
+    public function get_nextid() {
+        static $autoincrement = 0;
+        return ++$autoincrement;
+    }
+
     /**
      * @see parent::description()
      */

backup/converter/moodle1/simpletest/testlib.php

@@ -154,6 +154,18 @@ class moodle1_converter_test extends UnitTestCase {
         $converter->drop_stash_storage();
     }
 
+    public function test_get_nextid() {
+        $converter = convert_factory::get_converter('moodle1', $this->tempdir);
+
+        $id1 = $converter->get_nextid();
+        $id2 = $converter->get_nextid();
+        $id3 = $converter->get_nextid();
+
+        $this->assertTrue(0 < $id1);
+        $this->assertTrue($id1 < $id2);
+        $this->assertTrue($id2 < $id3);
+    }
+
     public function test_convert_run_convert() {
         $converter = convert_factory::get_converter('moodle1', $this->tempdir);
         $converter->convert();