task 2

src/ch/hevs/isc/slopify_v2/DataBaseHelper.scala

@@ -1,6 +1,6 @@
 package ch.hevs.isc.slopify_v2
 
-import java.io.File
+import java.io.{File, FileInputStream, FileOutputStream, ObjectInput, ObjectInputStream, ObjectOutputStream}
 
 object DataBaseHelper {
   def create(directory:String) : DataBase = {
@@ -52,11 +52,30 @@ object DataBaseHelper {
     return db
   }
 
-  def save(fileName:String, db:DataBase) : Unit = ???
-  def load(fileName:String) : DataBase = ???
+  def save(fileName: String, db: DataBase) : Unit = {
+    val fos: FileOutputStream = new FileOutputStream(fileName)
+    val oos: ObjectOutputStream = new ObjectOutputStream(fos)
+    oos.writeObject(db)
+    oos.close()
+  }
+  def load(fileName:String) : DataBase = {
+    val fis: FileInputStream = new FileInputStream(fileName)
+    val ois: ObjectInputStream = new ObjectInputStream(fis)
+    val db: DataBase = ois.readObject().asInstanceOf[DataBase]
+    ois.close()
+    return db
+  }
 
   def main(args: Array[String]): Unit = {
     val db: DataBase = create("res/songs")
+    println(db)
+    val artists: Array[Artist] = db.getArtists()
+    println(artists(0))
 
+    save("res/db.bin", db)
+    val db2: DataBase = load("res/db.bin")
+    println(db2)
+    val artists2: Array[Artist] = db2.getArtists()
+    println(artists2(0))
   }
 }