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+/**
+ * @file llteleporthistorystorage.h
+ * @brief Saving/restoring of teleport history.
+ *
+ * $LicenseInfo:firstyear=2009&license=viewergpl$
+ *
+ * Copyright (c) 2009, Linden Research, Inc.
+ *
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ *
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ *
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ *
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLTELEPORTHISTORYSTORAGE_H
+#define LL_LLTELEPORTHISTORYSTORAGE_H
+
+#include <vector>
+
+#include "llsingleton.h"
+#include "lldate.h"
+#include "v3dmath.h"
+
+class LLSD;
+
+/**
+ * An item of the teleport history, stored in file
+ *
+ * Contains the location's global coordinates, title and date.
+ */
+class LLTeleportHistoryPersistentItem
+{
+public:
+	LLTeleportHistoryPersistentItem()
+	{}
+
+	LLTeleportHistoryPersistentItem(const std::string title, const LLVector3d& global_pos)
+		: mTitle(title), mGlobalPos(global_pos), mDate(LLDate::now())
+	{}
+
+	LLTeleportHistoryPersistentItem(const std::string title, const LLVector3d& global_pos, const LLDate& date)
+		: mTitle(title), mGlobalPos(global_pos), mDate(date)
+	{}
+
+	LLTeleportHistoryPersistentItem(const LLSD& val);
+	LLSD toLLSD() const;
+
+	std::string	mTitle;
+	LLVector3d	mGlobalPos;
+	LLDate		mDate;
+};
+
+/**
+ * Persistent teleport history.
+ *
+ */
+class LLTeleportHistoryStorage: public LLSingleton<LLTeleportHistoryStorage>
+{
+	LOG_CLASS(LLTeleportHistoryStorage);
+
+public:
+
+	typedef std::vector<LLTeleportHistoryPersistentItem> slurl_list_t;
+
+	typedef boost::function<void()>		history_callback_t;
+	typedef boost::signals2::signal<void()>	history_signal_t;
+
+	LLTeleportHistoryStorage();
+	~LLTeleportHistoryStorage();
+
+	/**
+	 * @return history items.
+	 */
+	const slurl_list_t& getItems() const { return mItems; }
+	void			purgeItems();
+
+	void addItem(const std::string title, const LLVector3d& global_pos);
+	void addItem(const std::string title, const LLVector3d& global_pos, const LLDate& date);
+
+	void removeItem(S32 idx);
+
+	void save();
+	void load();
+
+	void dump() const;
+
+	/**
+	 * Set a callback to be called upon history changes.
+	 * 
+	 * Multiple callbacks can be set.
+	 */
+	boost::signals2::connection	setHistoryChangedCallback(history_callback_t cb);
+
+	/**
+	 * Go to specific item in the history.
+	 * 
+	 * The item is specified by its index (starting from 0).
+	 */
+	void					goToItem(S32 idx);
+
+private:
+
+	void onTeleportHistoryChange();
+	bool compareByTitleAndGlobalPos(const LLTeleportHistoryPersistentItem& a, const LLTeleportHistoryPersistentItem& b);
+
+	slurl_list_t	mItems;
+	std::string	mFilename;
+
+	/**
+	 * Signal emitted when the history gets changed.
+	 * 
+	 * Invokes callbacks set with setHistoryChangedCallback().
+	 */
+	history_signal_t		mHistoryChangedSignal;
+};
+
+#endif //LL_LLTELEPORTHISTORYSTORAGE_H