From 0206b5f8c0635e02039973ea1ddd0ece61b12dca Mon Sep 17 00:00:00 2001
From: Andrea Brighi <andrea.brighi8@studio.unibo.it>
Date: Wed, 17 May 2023 16:39:34 +0200
Subject: [PATCH] fix(desktop): in DesktopLocalDataSource throw exception if
 backpack not saved

---
 .../desktopdata/datasource/DesktopLocalDataSource.kt     | 2 +-
 .../desktopdata/datasource/DesktopLocalDataSourceImpl.kt | 9 ++++++---
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/desktopData/src/main/kotlin/com/intelligentbackpack/desktopdata/datasource/DesktopLocalDataSource.kt b/desktopData/src/main/kotlin/com/intelligentbackpack/desktopdata/datasource/DesktopLocalDataSource.kt
index 90de57a8..b20c996f 100644
--- a/desktopData/src/main/kotlin/com/intelligentbackpack/desktopdata/datasource/DesktopLocalDataSource.kt
+++ b/desktopData/src/main/kotlin/com/intelligentbackpack/desktopdata/datasource/DesktopLocalDataSource.kt
@@ -60,7 +60,7 @@ interface DesktopLocalDataSource {
     /**
      * Get the backpack hash
      */
-    fun getBackpack(): String
+    fun getBackpack(): String?
 
     /**
      * Associate the backpack to the desktop
diff --git a/desktopData/src/main/kotlin/com/intelligentbackpack/desktopdata/datasource/DesktopLocalDataSourceImpl.kt b/desktopData/src/main/kotlin/com/intelligentbackpack/desktopdata/datasource/DesktopLocalDataSourceImpl.kt
index 08f18bb9..0bb7a39b 100644
--- a/desktopData/src/main/kotlin/com/intelligentbackpack/desktopdata/datasource/DesktopLocalDataSourceImpl.kt
+++ b/desktopData/src/main/kotlin/com/intelligentbackpack/desktopdata/datasource/DesktopLocalDataSourceImpl.kt
@@ -86,9 +86,12 @@ class DesktopLocalDataSourceImpl(
         database.desktopDao().takeSchoolSuppliesFromBackpack(rfid)
     }
 
-    override fun getBackpack(): String {
-        return storage.getBackpack()
-    }
+    override fun getBackpack(): String? =
+        if (storage.isBackpackSaved()) {
+            storage.getBackpack()
+        } else {
+            null
+        }
 
     override fun associateBackpack(hash: String) {
         storage.saveBackpack(hash)