Add smart playlists, ratings and Qobuz

Fixes #259
Fixes #264

src/smartplaylists/playlistquerygenerator.cpp

@@ -0,0 +1,101 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2010, David Sansome <me@davidsansome.com>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "config.h"
+
+#include <QIODevice>
+#include <QDataStream>
+#include <QByteArray>
+#include <QString>
+
+#include "core/logging.h"
+#include "playlistquerygenerator.h"
+#include "collection/collectionbackend.h"
+
+PlaylistQueryGenerator::PlaylistQueryGenerator() : dynamic_(false), current_pos_(0) {}
+
+PlaylistQueryGenerator::PlaylistQueryGenerator(const QString &name, const SmartPlaylistSearch &search, const bool dynamic)
+    : search_(search), dynamic_(dynamic), current_pos_(0) {
+
+  set_name(name);
+
+}
+
+void PlaylistQueryGenerator::Load(const SmartPlaylistSearch &search) {
+
+  search_ = search;
+  dynamic_ = false;
+  current_pos_ = 0;
+
+}
+
+void PlaylistQueryGenerator::Load(const QByteArray &data) {
+
+  QDataStream s(data);
+  s >> search_;
+  s >> dynamic_;
+
+}
+
+QByteArray PlaylistQueryGenerator::Save() const {
+
+  QByteArray ret;
+  QDataStream s(&ret, QIODevice::WriteOnly);
+  s << search_;
+  s << dynamic_;
+
+  return ret;
+
+}
+
+PlaylistItemList PlaylistQueryGenerator::Generate() {
+
+  previous_ids_.clear();
+  current_pos_ = 0;
+  return GenerateMore(0);
+
+}
+
+PlaylistItemList PlaylistQueryGenerator::GenerateMore(const int count) {
+
+  SmartPlaylistSearch search_copy = search_;
+  search_copy.id_not_in_ = previous_ids_;
+  if (count) {
+    search_copy.limit_ = count;
+  }
+
+  if (search_copy.sort_type_ != SmartPlaylistSearch::Sort_Random) {
+    search_copy.first_item_ = current_pos_;
+    current_pos_ += search_copy.limit_;
+  }
+
+  SongList songs = backend_->FindSongs(search_copy);
+  PlaylistItemList items;
+  for (const Song &song : songs) {
+    items << PlaylistItemPtr(PlaylistItem::NewFromSong(song));
+    previous_ids_ << song.id();
+
+    if (previous_ids_.count() > GetDynamicFuture() + GetDynamicHistory())
+      previous_ids_.removeFirst();
+  }
+
+  return items;
+
+}