Renamed some stuff, courtesy of sensiolabs.

app/Generator/Chart/Account/AccountChartGeneratorInterface.php

@@ -0,0 +1,50 @@
+<?php
+/**
+ * AccountChartGeneratorInterface.php
+ * Copyright (C) 2016 Sander Dorigo
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+namespace FireflyIII\Generator\Chart\Account;
+
+use Carbon\Carbon;
+use FireflyIII\Models\Account;
+use Illuminate\Support\Collection;
+
+/**
+ * Interface AccountChartGeneratorInterface
+ *
+ * @package FireflyIII\Generator\Chart\Account
+ */
+interface AccountChartGeneratorInterface
+{
+
+    /**
+     * @param Collection $accounts
+     * @param Carbon     $start
+     * @param Carbon     $end
+     *
+     * @return array
+     */
+    public function expenseAccounts(Collection $accounts, Carbon $start, Carbon $end);
+
+    /**
+     * @param Collection $accounts
+     * @param Carbon     $start
+     * @param Carbon     $end
+     *
+     * @return array
+     */
+    public function frontpage(Collection $accounts, Carbon $start, Carbon $end);
+
+    /**
+     * @param Account $account
+     * @param Carbon  $start
+     * @param Carbon  $end
+     *
+     * @return array
+     */
+    public function single(Account $account, Carbon $start, Carbon $end);
+}