Expand and refactor factories.

app/Factory/TransactionCurrencyFactory.php

@@ -0,0 +1,67 @@
+<?php
+/**
+ * TransactionCurrencyFactory.php
+ * Copyright (c) 2018 thegrumpydictator@gmail.com
+ *
+ * This file is part of Firefly III.
+ *
+ * Firefly III is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Firefly III is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Firefly III. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+namespace FireflyIII\Factory;
+
+use FireflyIII\Models\TransactionCurrency;
+
+/**
+ * Class TransactionCurrencyFactory
+ */
+class TransactionCurrencyFactory
+{
+    /**
+     * @param int|null    $currencyId
+     * @param null|string $currencyCode
+     *
+     * @return TransactionCurrency|null
+     */
+    public function find(?int $currencyId, ?string $currencyCode): ?TransactionCurrency
+    {
+        $currencyCode = strval($currencyCode);
+        $currencyId   = intval($currencyId);
+
+        if (strlen($currencyCode) === 0 && intval($currencyId) === 0) {
+            return null;
+        }
+
+        // first by ID:
+        if ($currencyId > 0) {
+            $currency = TransactionCurrency::find($currencyId);
+            if (!is_null($currency)) {
+                return $currency;
+            }
+        }
+        // then by code:
+        if (strlen($currencyCode) > 0) {
+            $currency = TransactionCurrency::whereCode($currencyCode)->first();
+            if (!is_null($currency)) {
+                return $currency;
+            }
+        }
+
+        return null;
+    }
+
+
+}