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diff --git a/indra/newview/lldaycyclemanager.h b/indra/newview/lldaycyclemanager.h
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+/**
+ * @file lldaycyclemanager.h
+ * @brief Implementation for the LLDayCycleManager class.
+ *
+ * $LicenseInfo:firstyear=2011&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2011, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library 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
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLDAYCYCLEMANAGER_H
+#define LL_LLDAYCYCLEMANAGER_H
+
+#include <map>
+#include <string>
+
+#include "llwldaycycle.h"
+#include "llwlparammanager.h"
+
+/**
+ * WindLight day cycles manager class
+ *
+ * Provides interface for accessing, loading and saving day cycles.
+ */
+class LLDayCycleManager : public LLSingleton<LLDayCycleManager>
+{
+	LOG_CLASS(LLDayCycleManager);
+
+public:
+	typedef std::list<std::string> preset_name_list_t;
+
+	typedef std::map<std::string, LLWLDayCycle> dc_map_t;
+	typedef boost::signals2::signal<void()> modify_signal_t;
+
+	void getPresetNames(preset_name_list_t& names) const;
+	void getPresetNames(preset_name_list_t& user, preset_name_list_t& sys) const;
+	void getUserPresetNames(preset_name_list_t& user) const;
+
+	bool getPreset(const std::string name, LLWLDayCycle& day_cycle) const;
+	bool getPreset(const std::string name, LLSD& day_cycle) const;
+	bool presetExists(const std::string name) const;
+	bool isSystemPreset(const std::string& name) const;
+	bool savePreset(const std::string& name, const LLSD& data);
+	bool deletePreset(const std::string& name);
+
+	/// @return true if there is a day cycle that refers to the sky preset.
+	bool isSkyPresetReferenced(const std::string& preset_name) const;
+
+	/// Emitted when a preset gets added or deleted.
+	boost::signals2::connection setModifyCallback(const modify_signal_t::slot_type& cb);
+
+private:
+	friend class LLSingleton<LLDayCycleManager>;
+	/*virtual*/ void initSingleton();
+
+	void loadAllPresets();
+	void loadPresets(const std::string& dir);
+	bool loadPreset(const std::string& path);
+	bool addPreset(const std::string& name, const LLSD& data);
+
+	static std::string getSysDir();
+	static std::string getUserDir();
+
+	dc_map_t mDayCycleMap;
+	modify_signal_t mModifySignal;
+};
+
+#endif // LL_LLDAYCYCLEMANAGER_H