feat(inventory): create a common method for inventory

Signed-off-by: Rafa Hernandez <rhernandez@teclib.com>

app/src/main/java/org/flyve/mdm/agent/utils/Inventory.java

@@ -0,0 +1,52 @@
+package org.flyve.mdm.agent.utils;
+
+/*
+ *   Copyright © 2018 Teclib. All rights reserved.
+ *
+ *   This file is part of flyve-mdm-android
+ *
+ * flyve-mdm-android is a subproject of Flyve MDM. Flyve MDM is a mobile
+ * device management software.
+ *
+ * Flyve MDM 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.
+ *
+ * Flyve MDM 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.
+ * ------------------------------------------------------------------------------
+ * @author    Rafael Hernandez
+ * @date      1/5/18
+ * @copyright Copyright © 2018 Teclib. All rights reserved.
+ * @license   GPLv3 https://www.gnu.org/licenses/gpl-3.0.html
+ * @link      https://github.com/flyve-mdm/flyve-mdm-android
+ * @link      https://flyve-mdm.com
+ * ------------------------------------------------------------------------------
+ */
+
+import android.content.Context;
+
+import org.flyve.inventory.InventoryTask;
+import org.flyve.mdm.agent.BuildConfig;
+import org.flyve.mdm.agent.data.MqttData;
+
+public class Inventory {
+    private static final String APP_VERSION = "FlyveMDMAgent_" + BuildConfig.VERSION_NAME;
+
+    public void getXMLInventory(Context context, InventoryTask.OnTaskCompleted callback) {
+        InventoryTask inventoryTask = new InventoryTask(context, APP_VERSION, true);
+        MqttData cache = new MqttData(context);
+
+        String invitationToken = cache.getInvitationToken();
+        if(!invitationToken.isEmpty()){
+            String tag = "invitation_" + invitationToken;
+            FlyveLog.i(tag);
+            inventoryTask.setTag(tag);
+        }
+
+        inventoryTask.getXML(callback);
+    }
+}