utilize downloaded files within detail activities

app/src/main/java/com/dkanada/gramophone/database/Cache.java

@@ -0,0 +1,29 @@
+package com.dkanada.gramophone.database;
+
+import androidx.annotation.NonNull;
+import androidx.room.ColumnInfo;
+import androidx.room.Entity;
+import androidx.room.PrimaryKey;
+
+import com.dkanada.gramophone.model.Song;
+
+import java.util.UUID;
+
+@Entity(tableName = "cache")
+public class Cache {
+    @NonNull
+    @PrimaryKey
+    public String id;
+
+    @ColumnInfo(defaultValue = "1")
+    public Boolean cache;
+
+    public Cache() {
+        this.id = UUID.randomUUID().toString();
+    }
+
+    public Cache(Song song) {
+        this.id = song.id;
+        this.cache = true;
+    }
+}

app/src/main/java/com/dkanada/gramophone/database/CacheDao.java

@@ -0,0 +1,19 @@
+package com.dkanada.gramophone.database;
+
+import androidx.room.Dao;
+import androidx.room.Insert;
+import androidx.room.OnConflictStrategy;
+import androidx.room.Query;
+
+import com.dkanada.gramophone.model.Song;
+
+import java.util.List;
+
+@Dao
+public interface CacheDao {
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    void insertCache(Cache cache);
+
+    @Query("SELECT * FROM songs LEFT JOIN cache USING(id) WHERE songs.id IN (:ids)")
+    List<Song> getSongs(List<String> ids);
+}

app/src/main/java/com/dkanada/gramophone/database/JellyDatabase.java

@@ -10,14 +10,16 @@ import com.dkanada.gramophone.model.User;
 
 @androidx.room.Database(
         entities = {
+                Cache.class,
                 Song.class,
                 QueueSong.class,
                 User.class
         },
-        version = 4,
+        version = 5,
         exportSchema = false
 )
 public abstract class JellyDatabase extends RoomDatabase {
+    public abstract CacheDao cacheDao();
     public abstract SongDao songDao();
     public abstract QueueSongDao queueSongDao();
     public abstract UserDao userDao();
@@ -52,4 +54,12 @@ public abstract class JellyDatabase extends RoomDatabase {
                     + "name TEXT, server TEXT, token TEXT)");
         }
     };
+
+    public static final Migration Migration5 = new Migration(4, 5) {
+        @Override
+        public void migrate(@NonNull SupportSQLiteDatabase database) {
+            database.execSQL("CREATE TABLE cache (id TEXT NOT NULL PRIMARY KEY,"
+                    + "cache INTEGER NOT NULL)");
+        }
+    };
 }

app/src/main/java/com/dkanada/gramophone/database/QueueSongDao.java

@@ -4,6 +4,7 @@ import androidx.room.Dao;
 import androidx.room.Insert;
 import androidx.room.OnConflictStrategy;
 import androidx.room.Query;
+import androidx.room.Transaction;
 
 import com.dkanada.gramophone.App;
 import com.dkanada.gramophone.model.Song;
@@ -22,6 +23,7 @@ public abstract class QueueSongDao {
     @Query("SELECT * from queueSongs WHERE queue = :queue ORDER BY `index`")
     public abstract List<QueueSong> getQueueSongs(int queue);
 
+    @Transaction
     public List<Song> getQueue(int queue) {
         List<QueueSong> queueSongs = getQueueSongs(queue);
         List<Song> songs = new ArrayList<>();
@@ -34,6 +36,7 @@ public abstract class QueueSongDao {
         return songs;
     }
 
+    @Transaction
     public void setQueue(List<Song> songs, int queue) {
         List<QueueSong> queueSongs = new ArrayList<>();
         for (int i = 0; i < songs.size(); i++) {