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+/*
+    hierarchicalkeylistjob.h
+
+    This file is part of qgpgme, the Qt API binding for gpgme
+    Copyright (c) 2004 Klarälvdalens Datakonsult AB
+    Copyright (c) 2016 Intevation GmbH
+
+    QGpgME 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 2 of the
+    License, or (at your option) any later version.
+
+    QGpgME 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 this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+    In addition, as a special exception, the copyright holders give
+    permission to link the code of this program with any edition of
+    the Qt library by Trolltech AS, Norway (or with modified versions
+    of Qt that use the same license as Qt), and distribute linked
+    combinations including the two.  You must obey the GNU General
+    Public License in all respects for all of the code used other than
+    Qt.  If you modify this file, you may extend this exception to
+    your version of the file, but you are not obligated to do so.  If
+    you do not wish to do so, delete this exception statement from
+    your version.
+*/
+
+#ifndef __KLEO_HIERARCHICALKEYLISTJOB_H__
+#define __KLEO_HIERARCHICALKEYLISTJOB_H__
+
+#include "qgpgme_export.h"
+#include "keylistjob.h"
+#include "cryptobackend.h"
+
+#ifdef BUILDING_QGPGME
+# include "keylistresult.h"
+#else
+#include <gpgme++/keylistresult.h>
+#endif
+
+#include <QPointer>
+
+#include <set>
+
+namespace GpgME
+{
+class Error;
+class Key;
+}
+
+namespace QGpgME
+{
+class KeyListJob;
+}
+
+namespace QGpgME
+{
+
+/**
+   @short A convenience job that additionally fetches all available issuers.
+
+   To use a HierarchicalKeyListJob, pass it a CryptoBackend
+   implementation, connect the progress() and result() signals to
+   suitable slots and then start the keylisting with a call to
+   start(). This call might fail, in which case the
+   HierarchicalKeyListJob instance will have scheduled it's own
+   destruction with a call to QObject::deleteLater().
+
+   After result() is emitted, the HierarchicalKeyListJob will
+   schedule its own destruction by calling QObject::deleteLater().
+*/
+class QGPGME_EXPORT HierarchicalKeyListJob : public KeyListJob
+{
+    Q_OBJECT
+public:
+    explicit HierarchicalKeyListJob(const Protocol *protocol,
+                                    bool remote = false, bool includeSigs = false,
+                                    bool validating = false);
+    ~HierarchicalKeyListJob();
+
+    /**
+       Starts the keylist operation. \a patterns is a list of patterns
+       used to restrict the list of keys returned. Empty patterns are
+       ignored. \a patterns must not be empty or contain only empty
+       patterns; use the normal KeyListJob for a full listing.
+
+       The \a secretOnly parameter is ignored by
+       HierarchicalKeyListJob and must be set to false.
+    */
+    GpgME::Error start(const QStringList &patterns, bool secretOnly = false) Q_DECL_OVERRIDE;
+
+    GpgME::KeyListResult exec(const QStringList &patterns, bool secretOnly,
+                              std::vector<GpgME::Key> &keys) Q_DECL_OVERRIDE;
+
+private Q_SLOTS:
+    void slotResult(const GpgME::KeyListResult &);
+    void slotNextKey(const GpgME::Key &key);
+    /* from Job */
+    void slotCancel() Q_DECL_OVERRIDE;
+
+private:
+    GpgME::Error startAJob();
+
+private:
+    const Protocol *const mProtocol;
+    const bool mRemote;
+    const bool mIncludeSigs;
+    const bool mValidating;
+    bool mTruncated;
+    std::set<QString> mSentSet; // keys already sent (prevent duplicates even if the backend should return them)
+    std::set<QString> mScheduledSet; // keys already scheduled (by starting a job for them)
+    std::set<QString> mNextSet; // keys to schedule for the next iteraton
+    GpgME::KeyListResult mIntermediateResult;
+    QPointer<KeyListJob> mJob;
+};
+
+}
+
+#endif // __KLEO_HIERARCHICALKEYLISTJOB_H__