Add saved entity and dao

Signed-off-by: Aditya Wasan <adityawasan55@gmail.com>

data/src/main/java/dev/msfjarvis/lobsters/data/model/SavedLobstersEntity.kt

@@ -0,0 +1,14 @@
+package dev.msfjarvis.lobsters.data.model
+
+import androidx.room.Embedded
+import androidx.room.Entity
+import dev.msfjarvis.lobsters.model.LobstersPost
+
+@Entity(
+  tableName = "lobsters_saved_posts",
+  primaryKeys = ["shortId"],
+)
+data class SavedLobstersEntity(
+  @Embedded
+  val post: LobstersPost
+)

data/src/main/java/dev/msfjarvis/lobsters/data/source/SavedPostsDao.kt

@@ -0,0 +1,40 @@
+package dev.msfjarvis.lobsters.data.source
+
+import androidx.room.Dao
+import androidx.room.Delete
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import androidx.room.Transaction
+import dev.msfjarvis.lobsters.data.model.LobstersEntity
+import dev.msfjarvis.lobsters.data.model.SavedLobstersEntity
+import dev.msfjarvis.lobsters.model.LobstersPost
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+abstract class SavedPostsDao {
+  @Query("SELECT * FROM lobsters_saved_posts")
+  abstract fun loadPosts(): Flow<List<LobstersPost>>
+
+  @Transaction
+  open suspend fun insertPosts(vararg posts: LobstersPost) {
+    insertPosts(posts.map { SavedLobstersEntity(it) })
+  }
+
+  @Insert(onConflict = OnConflictStrategy.IGNORE)
+  protected abstract suspend fun insertPosts(posts: List<SavedLobstersEntity>)
+
+  @Transaction
+  open suspend fun deletePosts(vararg posts: LobstersPost) {
+    deletePosts(posts.map { SavedLobstersEntity(it) })
+  }
+
+  @Delete
+  protected abstract suspend fun deletePosts(posts: List<SavedLobstersEntity>)
+
+  @Query("DELETE FROM lobsters_saved_posts")
+  abstract suspend fun deleteAllPosts()
+
+  @Query("DELETE FROM lobsters_saved_posts WHERE shortId LIKE :shortId")
+  abstract suspend fun deletePostById(shortId: String)
+}