Lots of new code for new importer routine.

app/Import/FileProcessor/FileProcessorInterface.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ * FileProcessorInterface.php
+ * Copyright (c) 2017 thegrumpydictator@gmail.com
+ * This software may be modified and distributed under the terms of the Creative Commons Attribution-ShareAlike 4.0 International License.
+ *
+ * See the LICENSE file for details.
+ */
+
+declare(strict_types=1);
+
+namespace FireflyIII\Import\FileProcessor;
+
+use FireflyIII\Models\ImportJob;
+use Illuminate\Support\Collection;
+
+/**
+ * Interface FileProcessorInterface
+ *
+ * @package FireflyIII\Import\FileProcessor
+ */
+interface FileProcessorInterface
+{
+    /**
+     * FileProcessorInterface constructor.
+     *
+     * @param ImportJob $job
+     */
+    public function __construct(ImportJob $job);
+
+    /**
+     * @return bool
+     */
+    public function run(): bool;
+
+    /**
+     * @return Collection
+     */
+    public function getObjects(): Collection;
+}