Move edit ref name methods from ChangeEditUtil to RefNames

Change-Id: I797c227fed66ef1e5761c6367f1a96aaeb23c7f2

gerrit-reviewdb/src/main/java/com/google/gerrit/reviewdb/client/RefNames.java

@@ -78,6 +78,36 @@ public class RefNames {
     return r.toString();
   }
 
+  /**
+   * Returns reference for this change edit with sharded user and change number:
+   * refs/users/UU/UUUU/edit-CCCC/P.
+   *
+   * @param accountId account id
+   * @param changeId change number
+   * @param psId patch set number
+   * @return reference for this change edit
+   */
+  public static String refsEdit(Account.Id accountId, Change.Id changeId,
+      PatchSet.Id psId) {
+    return refsEditPrefix(accountId, changeId) + psId.get();
+  }
+
+  /**
+   * Returns reference prefix for this change edit with sharded user and
+   * change number: refs/users/UU/UUUU/edit-CCCC/.
+   *
+   * @param accountId account id
+   * @param changeId change number
+   * @return reference prefix for this change edit
+   */
+  public static String refsEditPrefix(Account.Id accountId, Change.Id changeId) {
+    return new StringBuilder(refsUsers(accountId))
+      .append("/edit-")
+      .append(changeId.get())
+      .append("/")
+      .toString();
+  }
+
   private RefNames() {
   }
 }