task 1.2-3

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

@@ -4,4 +4,6 @@ import scala.collection.mutable.ArrayBuffer
 
 class Album(val name: String) {
   private var songs: ArrayBuffer[Song] = new ArrayBuffer()
+  def addSong(song: Song): Unit = songs.addOne(song)
+  def containsSong(song: Song): Boolean = songs.contains(song)
 }

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

@@ -4,4 +4,7 @@ import scala.collection.mutable.ArrayBuffer
 
 class Artist(val name: String) {
   private var albums: ArrayBuffer[Album] = new ArrayBuffer()
+  def addAlbum(album: Album): Unit = albums.addOne(album)
+
+  def hasAlbum(album: Album): Boolean = albums.contains(album)
 }

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

@@ -4,4 +4,6 @@ import scala.collection.mutable.ArrayBuffer
 
 class DataBase {
   private var artists: ArrayBuffer[Artist] = new ArrayBuffer()
+  def addArtist(artist: Artist): Unit = artists.addOne(artist)
+  def containsArtist(artist: Artist): Boolean = artists.contains(artist)
 }

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

@@ -0,0 +1,62 @@
+package ch.hevs.isc.slopify_v2
+
+import java.io.File
+
+object DataBaseHelper {
+  def create(directory:String) : DataBase = {
+    val db = new DataBase()
+    for (a <- new File(directory).listFiles() if a.isDirectory) {
+      val artistName = a.getName
+      println(s"found new artist : $artistName")
+      val artist: Artist = new Artist(artistName)
+
+      for (b <- a.listFiles() if b.isDirectory ) {
+        val albumName = b.getName
+        println(s"found new album $albumName for artist : $artistName")
+        val album: Album = new Album(albumName)
+
+        for (c <- b.listFiles() if c.isFile if c.getName.toLowerCase().endsWith(".mp3") ) {
+          val fileName = c.getName.substring(0, c.getName.length - 4)
+          val format1 = """(\d*) (.*)""".r
+          val format2 = """(\d*)-(\d*) (.*)""".r
+          val format3 = """(\d*)-(.*)""".r
+          var songName: String = ""
+          var songNumber: Int = 0
+
+          fileName match {
+            case format1(nr, name) => {
+              println(s"found song nr #$nr name:'$name' in album '$albumName' for artist : '${a.getName}'")
+              songName = name
+              songNumber = Integer.parseInt(nr)
+            }
+            case format2(cd, nr, name) => {
+              println(s"found song nr #$nr on cd#$cd name:'$name' in album '$albumName' for artist : '${a.getName}'")
+              songName = name
+              songNumber = Integer.parseInt(nr)
+            }
+            case format3(nr, name) => {
+              println(s"found song nr #$nr name:'$name' in album '$albumName' for artist : '$artistName'")
+              songName = name
+              songNumber = Integer.parseInt(nr)
+            }
+          }
+
+          val song: Song = new Song(songName, songNumber)
+          album.addSong(song)
+        }
+        artist.addAlbum(album)
+      }
+      db.addArtist(artist)
+    }
+
+    return db
+  }
+
+  def save(fileName:String, db:DataBase) : Unit = ???
+  def load(fileName:String) : DataBase = ???
+
+  def main(args: Array[String]): Unit = {
+    val db: DataBase = create("res/songs")
+
+  }
+}