Add Room base classes

app/build.gradle

@@ -4,6 +4,8 @@ apply plugin: 'kotlin-android'
 
 apply plugin: 'kotlin-android-extensions'
 
+apply plugin: 'kotlin-kapt'
+
 android {
     compileSdkVersion 29
     buildToolsVersion "29.0.2"
@@ -42,6 +44,9 @@ dependencies {
     implementation 'androidx.lifecycle:lifecycle-extensions:2.1.0'
     implementation 'androidx.navigation:navigation-fragment-ktx:2.1.0'
     implementation 'androidx.navigation:navigation-ui-ktx:2.1.0'
+    implementation "androidx.room:room-runtime:2.2.0-rc01"
+    kapt "androidx.room:room-compiler:2.2.0-rc01"
+    implementation "androidx.room:room-ktx:2.2.0-rc01"
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test:runner:1.2.0'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

app/src/main/java/net/underdesk/circolapp/data/AppDatabase.kt

@@ -0,0 +1,47 @@
+/*
+ * Circolapp
+ * Copyright (C) 2019  Matteo Schiff
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package net.underdesk.circolapp.data
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+
+@Database(entities = [Circular::class], version = 1, exportSchema = false)
+abstract class AppDatabase : RoomDatabase() {
+    abstract fun circularDao(): CircularDao
+
+    companion object {
+
+        @Volatile
+        private var instance: AppDatabase? = null
+
+        private const val DATABASE_NAME = "database"
+
+        fun getInstance(context: Context): AppDatabase {
+            return instance ?: synchronized(this) {
+                instance ?: Room.databaseBuilder(
+                    context,
+                    AppDatabase::class.java,
+                    DATABASE_NAME
+                ).build().also { instance = it }
+            }
+        }
+    }
+}

app/src/main/java/net/underdesk/circolapp/data/Circular.kt

@@ -0,0 +1,29 @@
+/*
+ * Circolapp
+ * Copyright (C) 2019  Matteo Schiff
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package net.underdesk.circolapp.data
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "circulars")
+data class Circular(
+    @PrimaryKey(autoGenerate = true) val id: Long,
+    val name: String,
+    val url: String
+)

app/src/main/java/net/underdesk/circolapp/data/CircularDao.kt

@@ -0,0 +1,34 @@
+/*
+ * Circolapp
+ * Copyright (C) 2019  Matteo Schiff
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package net.underdesk.circolapp.data
+
+import androidx.lifecycle.LiveData
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+
+@Dao
+interface CircularDao {
+    @Query("SELECT * FROM circulars")
+    fun getCirculars(): LiveData<List<Circular>>
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertAll(circulars: List<Circular>)
+}

app/src/main/java/net/underdesk/circolapp/server/DataFetcher.kt

@@ -1,3 +1,21 @@
+/*
+ * Circolapp
+ * Copyright (C) 2019  Matteo Schiff
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package net.underdesk.circolapp.server
 
 import com.google.gson.Gson