Add DAOs for Room and provisions for their Hilt injections

Change-Id: Ia14c225cc1632ded38abffc201b673a6a60f4451

app/build.gradle

@@ -163,6 +163,7 @@ dependencies {
     kapt libs.hilt.compiler
 
     implementation libs.room.runtime
+    implementation libs.room.ktx
     ksp libs.room.compiler
 
     implementation libs.protobuf.kotlin.lite

app/src/main/java/com/google/samples/apps/nowinandroid/data/fake/FakeData.kt

@@ -17,12 +17,18 @@
 package com.google.samples.apps.nowinandroid.data.fake
 
 import com.google.samples.apps.nowinandroid.data.network.NetworkNewsResource
+import com.google.samples.apps.nowinandroid.data.network.NetworkTopic
 import kotlinx.datetime.LocalDateTime
 import kotlinx.datetime.TimeZone
 import kotlinx.datetime.toInstant
 import org.intellij.lang.annotations.Language
 
 object FakeDataSource {
+    val sampleTopic = NetworkTopic(
+        id = 0,
+        name = "Headlines",
+        description = "",
+    )
     val sampleResource = NetworkNewsResource(
         id = 1,
         episodeId = 52,

app/src/main/java/com/google/samples/apps/nowinandroid/data/fake/FakeNiANetwork.kt

@@ -17,8 +17,10 @@
 package com.google.samples.apps.nowinandroid.data.fake
 
 import com.google.samples.apps.nowinandroid.data.network.NetworkNewsResource
+import com.google.samples.apps.nowinandroid.data.network.NetworkTopic
 import com.google.samples.apps.nowinandroid.data.network.NiANetwork
 import com.google.samples.apps.nowinandroid.di.NiaDispatchers
+import javax.inject.Inject
 import kotlinx.coroutines.withContext
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.decodeFromString
@@ -27,10 +29,15 @@ import kotlinx.serialization.json.Json
 /**
  * [NiANetwork] implementation that provides static news resources to aid development
  */
-class FakeNiANetwork(
+class FakeNiANetwork @Inject constructor(
     private val dispatchers: NiaDispatchers,
     private val networkJson: Json
 ) : NiANetwork {
+    override suspend fun getTopics(): List<NetworkTopic> =
+        withContext(dispatchers.IO) {
+            networkJson.decodeFromString(FakeDataSource.topicsData)
+        }
+
     override suspend fun getNewsResources(): List<NetworkNewsResource> =
         withContext(dispatchers.IO) {
             networkJson.decodeFromString<ResourceData>(FakeDataSource.data).resources

app/src/main/java/com/google/samples/apps/nowinandroid/data/local/NiADatabase.kt

@@ -19,6 +19,10 @@ package com.google.samples.apps.nowinandroid.data.local
 import androidx.room.Database
 import androidx.room.RoomDatabase
 import androidx.room.TypeConverters
+import com.google.samples.apps.nowinandroid.data.local.dao.AuthorDao
+import com.google.samples.apps.nowinandroid.data.local.dao.EpisodeDao
+import com.google.samples.apps.nowinandroid.data.local.dao.NewsResourceDao
+import com.google.samples.apps.nowinandroid.data.local.dao.TopicDao
 import com.google.samples.apps.nowinandroid.data.local.entities.AuthorEntity
 import com.google.samples.apps.nowinandroid.data.local.entities.EpisodeAuthorCrossRef
 import com.google.samples.apps.nowinandroid.data.local.entities.EpisodeEntity
@@ -29,7 +33,6 @@ import com.google.samples.apps.nowinandroid.data.local.entities.TopicEntity
 import com.google.samples.apps.nowinandroid.data.local.utilities.InstantConverter
 import com.google.samples.apps.nowinandroid.data.local.utilities.NewsResourceTypeConverter
 
-// TODO: ADD DAOs
 @Database(
     entities = [
         AuthorEntity::class,
@@ -46,4 +49,9 @@ import com.google.samples.apps.nowinandroid.data.local.utilities.NewsResourceTyp
     InstantConverter::class,
     NewsResourceTypeConverter::class,
 )
-abstract class NiADatabase : RoomDatabase()
+abstract class NiADatabase : RoomDatabase() {
+    abstract fun topicDao(): TopicDao
+    abstract fun authorDao(): AuthorDao
+    abstract fun episodeDao(): EpisodeDao
+    abstract fun newsResourceDao(): NewsResourceDao
+}

app/src/main/java/com/google/samples/apps/nowinandroid/data/local/dao/AuthorDao.kt

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.data.local.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.Query
+import com.google.samples.apps.nowinandroid.data.local.entities.AuthorEntity
+import kotlinx.coroutines.flow.Flow
+
+/**
+ * DAO for [AuthorEntity] access
+ */
+@Dao
+interface AuthorDao {
+    @Query(value = "SELECT * FROM authors")
+    fun getAuthorsStream(): Flow<List<AuthorEntity>>
+
+    @Insert
+    suspend fun saveAuthorEntities(entities: List<AuthorEntity>)
+}

app/src/main/java/com/google/samples/apps/nowinandroid/data/local/dao/EpisodeDao.kt

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.data.local.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.Query
+import com.google.samples.apps.nowinandroid.data.local.entities.EpisodeEntity
+import com.google.samples.apps.nowinandroid.data.model.Episode
+import kotlinx.coroutines.flow.Flow
+
+/**
+ * DAO for [EpisodeEntity] and [Episode] access
+ */
+@Dao
+interface EpisodeDao {
+    @Query(value = "SELECT * FROM episodes")
+    fun getEpisodesStream(): Flow<List<Episode>>
+
+    @Insert
+    suspend fun saveEpisodeEntities(entities: List<EpisodeEntity>)
+}

app/src/main/java/com/google/samples/apps/nowinandroid/data/local/dao/NewsResourceDao.kt

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.data.local.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.Query
+import com.google.samples.apps.nowinandroid.data.local.entities.NewsResourceEntity
+import com.google.samples.apps.nowinandroid.data.model.NewsResource
+import kotlinx.coroutines.flow.Flow
+
+/**
+ * DAO for [NewsResource] and [NewsResourceEntity] access
+ */
+@Dao
+interface NewsResourceDao {
+    @Query(value = "SELECT * FROM news_resources")
+    fun getNewsResourcesStream(): Flow<List<NewsResource>>
+
+    @Query(
+        value = """
+        SELECT * FROM news_resources
+        WHERE id IN (:filterTopicIds)
+    """
+    )
+    fun getNewsResourcesStream(filterTopicIds: Set<Int>): Flow<List<NewsResource>>
+
+    @Insert
+    suspend fun saveNewsResourceEntities(entities: List<NewsResourceEntity>)
+}

app/src/main/java/com/google/samples/apps/nowinandroid/data/local/dao/TopicDao.kt

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.data.local.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.Query
+import com.google.samples.apps.nowinandroid.data.local.entities.TopicEntity
+import kotlinx.coroutines.flow.Flow
+
+/**
+ * DAO for [TopicEntity] access
+ */
+@Dao
+interface TopicDao {
+    @Query(value = "SELECT * FROM topics")
+    fun getTopicEntitiesStream(): Flow<List<TopicEntity>>
+
+    @Query(
+        value = """
+        SELECT * FROM topics
+        WHERE id IN (:ids)
+    """
+    )
+    fun getTopicEntitiesStream(ids: Set<Int>): Flow<List<TopicEntity>>
+
+    @Insert
+    suspend fun saveTopics(entities: List<TopicEntity>)
+}

app/src/main/java/com/google/samples/apps/nowinandroid/data/model/Episode.kt

@@ -36,9 +36,13 @@ data class Episode(
     )
     val newsResources: List<NewsResourceEntity>,
     @Relation(
-        parentColumn = "episode_id",
+        parentColumn = "id",
-        entityColumn = "author_id",
+        entityColumn = "id",
-        associateBy = Junction(EpisodeAuthorCrossRef::class)
+        associateBy = Junction(
+            value = EpisodeAuthorCrossRef::class,
+            parentColumn = "episode_id",
+            entityColumn = "author_id",
+        )
     )
     val authors: List<AuthorEntity>
 )

app/src/main/java/com/google/samples/apps/nowinandroid/data/model/NewsResource.kt

@@ -38,15 +38,23 @@ data class NewsResource(
     )
     val episode: EpisodeEntity,
     @Relation(
-        parentColumn = "news_resource_id",
+        parentColumn = "id",
-        entityColumn = "author_id",
+        entityColumn = "id",
-        associateBy = Junction(NewsResourceAuthorCrossRef::class)
+        associateBy = Junction(
+            value = NewsResourceAuthorCrossRef::class,
+            parentColumn = "news_resource_id",
+            entityColumn = "author_id",
+        )
     )
     val authors: List<AuthorEntity>,
     @Relation(
-        parentColumn = "news_resource_id",
+        parentColumn = "id",
-        entityColumn = "topic_id",
+        entityColumn = "id",
-        associateBy = Junction(NewsResourceTopicCrossRef::class)
+        associateBy = Junction(
+            value = NewsResourceTopicCrossRef::class,
+            parentColumn = "news_resource_id",
+            entityColumn = "topic_id",
+        )
     )
     val topics: List<TopicEntity>
 )

app/src/main/java/com/google/samples/apps/nowinandroid/data/network/NiANetwork.kt

@@ -20,5 +20,7 @@ package com.google.samples.apps.nowinandroid.data.network
  * Interface representing network calls to the NIA backend
  */
 interface NiANetwork {
+    suspend fun getTopics(): List<NetworkTopic>
+
     suspend fun getNewsResources(): List<NetworkNewsResource>
 }

app/src/main/java/com/google/samples/apps/nowinandroid/di/AppModule.kt

@@ -47,7 +47,9 @@ interface AppModule {
     ): NiANetwork
 
     @Binds
-    fun bindsTopicRepository(fakeTopicsRepository: FakeTopicsRepository): TopicsRepository
+    fun bindsTopicRepository(
+        fakeTopicsRepository: FakeTopicsRepository
+    ): TopicsRepository
 
     @Binds
     fun bindsNewsResourceRepository(

app/src/main/java/com/google/samples/apps/nowinandroid/di/DaosModule.kt

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.di
+
+import com.google.samples.apps.nowinandroid.data.local.NiADatabase
+import com.google.samples.apps.nowinandroid.data.local.dao.AuthorDao
+import com.google.samples.apps.nowinandroid.data.local.dao.EpisodeDao
+import com.google.samples.apps.nowinandroid.data.local.dao.NewsResourceDao
+import com.google.samples.apps.nowinandroid.data.local.dao.TopicDao
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+
+@Module
+@InstallIn(SingletonComponent::class)
+interface DaosModule {
+    companion object {
+        @Provides
+        fun providesAuthorDao(
+            database: NiADatabase,
+        ): AuthorDao = database.authorDao()
+
+        @Provides
+        fun providesTopicsDao(
+            database: NiADatabase,
+        ): TopicDao = database.topicDao()
+
+        @Provides
+        fun providesEpisodeDao(
+            database: NiADatabase,
+        ): EpisodeDao = database.episodeDao()
+
+        @Provides
+        fun providesNewsResourceDao(
+            database: NiADatabase,
+        ): NewsResourceDao = database.newsResourceDao()
+    }
+}

app/src/main/java/com/google/samples/apps/nowinandroid/di/DatabaseModule.kt

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.di
+
+import android.content.Context
+import androidx.room.Room
+import com.google.samples.apps.nowinandroid.data.local.NiADatabase
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.android.qualifiers.ApplicationContext
+import dagger.hilt.components.SingletonComponent
+import javax.inject.Singleton
+
+@Module
+@InstallIn(SingletonComponent::class)
+interface DatabaseModule {
+    companion object {
+        @Provides
+        @Singleton
+        fun providesNiADatabase(
+            @ApplicationContext context: Context,
+        ): NiADatabase = Room.databaseBuilder(
+            context,
+            NiADatabase::class.java,
+            "nia-database"
+        ).build()
+    }
+}

app/src/test/java/com/google/samples/apps/nowinandroid/data/fake/FakeNiANetworkTest.kt

@@ -36,6 +36,14 @@ class FakeNiANetworkTest {
         )
     }
 
+    @Test
+    fun testDeserializationOfTopics() = runTest {
+        assertEquals(
+            FakeDataSource.sampleTopic,
+            subject.getTopics().first()
+        )
+    }
+
     @Test
     fun testDeserializationOfNewsResources() = runTest {
         assertEquals(

gradle/libs.versions.toml

@@ -74,6 +74,7 @@ protobuf-protoc = { group = "com.google.protobuf", name = "protoc", version.ref
 protobuf-kotlin-lite = { group = "com.google.protobuf", name = "protobuf-kotlin-lite", version.ref = "protobuf" }
 turbine = { group = "app.cash.turbine", name = "turbine", version.ref = "turbine" }
 room-runtime = { group = "androidx.room", name = "room-runtime", version.ref = "room" }
+room-ktx = { group = "androidx.room", name = "room-ktx", version.ref = "room" }
 room-compiler = { group = "androidx.room", name = "room-compiler", version.ref = "room" }
 
 [plugins]