Added database persistence ability

app/src/main/java/com/denizk0461/studip/db/EventDAO.kt

@@ -0,0 +1,20 @@
+package com.denizk0461.studip.db
+
+import androidx.lifecycle.LiveData
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.Query
+import com.denizk0461.studip.data.StudIPEvent
+
+@Dao
+interface EventDAO {
+
+    @get:Query("SELECT * FROM events ORDER BY id")
+    val allEvents: LiveData<List<StudIPEvent>>
+
+    @Insert
+    fun insertEvent(event: StudIPEvent)
+
+    @Query("DELETE FROM events")
+    fun nukeEvents()
+}

app/src/main/java/com/denizk0461/studip/db/EventDatabase.kt

@@ -0,0 +1,30 @@
+package com.denizk0461.studip.db
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+import com.denizk0461.studip.data.StudIPEvent
+
+@Database(entities = [StudIPEvent::class], version = 1)
+abstract class EventDatabase : RoomDatabase() {
+
+    abstract fun dao(): EventDAO
+
+    companion object {
+        private var instance: EventDatabase? = null
+
+        fun getInstance(context: Context): EventDatabase {
+            if (instance == null) {
+                synchronized(EventDatabase::class) {
+                    instance = Room.databaseBuilder(
+                        context.applicationContext,
+                        EventDatabase::class.java,
+                        "event_db"
+                    ).build()
+                }
+            }
+            return instance!!
+        }
+    }
+}

app/src/main/java/com/denizk0461/studip/db/EventRepository.kt

@@ -0,0 +1,15 @@
+package com.denizk0461.studip.db
+
+import android.app.Application
+import androidx.lifecycle.LiveData
+import com.denizk0461.studip.data.StudIPEvent
+
+class EventRepository(app: Application) {
+
+    private val dao: EventDAO = EventDatabase.getInstance(app.applicationContext).dao()
+
+    val allEvents: LiveData<List<StudIPEvent>> = dao.allEvents
+
+    fun nukeEvents() { dao.nukeEvents() }
+    fun insertEvent(event: StudIPEvent) { dao.insertEvent(event) }
+}