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+#ifndef ADHOC_SESSION_HPP
+# define ADHOC_SESSION_HPP
+
+#include <xmpp/xmpp_stanza.hpp>
+
+#include <functional>
+#include <string>
+
+class XmppComponent;
+
+class AdhocCommand;
+class AdhocSession;
+
+/**
+ * A function executed as an ad-hoc command step. It takes a <command/>
+ * XmlNode and modifies it accordingly (inserting for example an <error/>
+ * node, or a data form…).
+ * TODO fix this:
+ * It also must call one of step_passed(), cancel() etc on the AdhocSession object.
+ */
+typedef std::function<void(XmppComponent*, AdhocSession&, XmlNode&)> AdhocStep;
+
+class AdhocSession
+{
+public:
+ explicit AdhocSession(const AdhocCommand& command, const std::string& jid);
+ ~AdhocSession();
+ /**
+ * Return the function to be executed, found in our AdhocCommand, for the
+ * current_step. And increment the current_step.
+ */
+ const AdhocStep& get_next_step();
+ /**
+ * Return the number of remaining steps.
+ */
+ size_t remaining_steps() const;
+ /**
+ * This may be modified by an AdhocStep, to indicate that this session
+ * should no longer exist, because we encountered an error, and we can't
+ * execute any more step of it.
+ */
+ void terminate();
+ bool is_terminated() const;
+
+private:
+ /**
+ * A reference of the command concerned by this session. Used for example
+ * to get the next step of that command, things like that.
+ */
+ const AdhocCommand& command;
+ /**
+ * The full JID of the XMPP user that created this session by executing
+ * the first step of a command. Only that JID must be allowed to access
+ * this session.
+ */
+ const std::string& owner_jid;
+ /**
+ * The current step we are at. It starts at zero. It is used to index the
+ * associated AdhocCommand::callbacks vector.
+ */
+ size_t current_step;
+ bool terminated;
+
+ AdhocSession(const AdhocSession&) = delete;
+ AdhocSession(AdhocSession&&) = delete;
+ AdhocSession& operator=(const AdhocSession&) = delete;
+ AdhocSession& operator=(AdhocSession&&) = delete;
+};
+
+#endif // ADHOC_SESSION_HPP