135 lines
3.8 KiB
C++
135 lines
3.8 KiB
C++
/* This file is part of Clementine.
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Copyright 2010, David Sansome <me@davidsansome.com>
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Clementine is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Clementine is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Clementine. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "librarysearchprovider.h"
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#include <QStack>
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#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
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#include <QRandomGenerator>
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#endif
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#include "core/logging.h"
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#include "covers/albumcoverloader.h"
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#include "library/librarybackend.h"
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#include "library/libraryquery.h"
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#include "library/sqlrow.h"
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#include "playlist/songmimedata.h"
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LibrarySearchProvider::LibrarySearchProvider(LibraryBackendInterface* backend,
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const QString& name,
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const QString& id,
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const QIcon& icon,
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bool enabled_by_default,
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Application* app, QObject* parent)
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: BlockingSearchProvider(app, parent), backend_(backend) {
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Hints hints =
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WantsSerialisedArtQueries | ArtIsInSongMetadata | CanGiveSuggestions;
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if (!enabled_by_default) {
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hints |= DisabledByDefault;
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}
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Init(name, id, icon, hints);
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}
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SearchProvider::ResultList LibrarySearchProvider::Search(int id,
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const QString& query) {
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QueryOptions options;
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options.set_filter(query);
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LibraryQuery q(options);
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q.SetColumnSpec("%songs_table.ROWID, " + Song::kColumnSpec);
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if (!backend_->ExecQuery(&q)) {
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return ResultList();
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}
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// Build the result list
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ResultList ret;
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while (q.Next()) {
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Result result(this);
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result.metadata_.InitFromQuery(q, true);
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ret << result;
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}
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return ret;
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}
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MimeData* LibrarySearchProvider::LoadTracks(const ResultList& results) {
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MimeData* ret = SearchProvider::LoadTracks(results);
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static_cast<SongMimeData*>(ret)->backend = backend_;
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return ret;
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}
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QStringList LibrarySearchProvider::GetSuggestions(int count) {
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// We'd like to use order by random(), but that's O(n) in sqlite, so instead
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// get the largest ROWID and pick a couple of random numbers within that
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// range.
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LibraryQuery q;
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q.SetColumnSpec("ROWID");
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q.SetOrderBy("ROWID DESC");
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q.SetIncludeUnavailable(true);
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q.SetLimit(1);
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QStringList ret;
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if (!backend_->ExecQuery(&q) || !q.Next()) {
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return ret;
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}
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const int largest_rowid = q.Value(0).toInt();
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for (int attempt = 0; attempt < count * 5; ++attempt) {
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if (ret.count() >= count) {
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break;
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}
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LibraryQuery q;
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q.SetColumnSpec("artist, album");
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q.SetIncludeUnavailable(true);
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#if (QT_VERSION < QT_VERSION_CHECK(5, 10, 0))
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q.AddWhere("ROWID", qrand() % largest_rowid);
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#else
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q.AddWhere("ROWID", QRandomGenerator::global()->bounded(largest_rowid));
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#endif
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q.SetLimit(1);
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if (!backend_->ExecQuery(&q) || !q.Next()) {
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continue;
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}
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const QString artist = q.Value(0).toString();
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const QString album = q.Value(1).toString();
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if (!artist.isEmpty() && !album.isEmpty())
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#if (QT_VERSION < QT_VERSION_CHECK(5, 10, 0))
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ret << ((qrand() % 2 == 0) ? artist : album);
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#else
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ret << (QRandomGenerator::global()->bounded(2) == 0 ? artist : album);
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#endif
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else if (!artist.isEmpty())
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ret << artist;
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else if (!album.isEmpty())
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ret << album;
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}
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return ret;
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}
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