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+/** 
+ * @file llinventoryobserver.h
+ * @brief LLInventoryObserver class header file
+ *
+ * $LicenseInfo:firstyear=2002&license=viewergpl$
+ * 
+ * Copyright (c) 2002-2009, 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_LLINVENTORYOBSERVERS_H
+#define LL_LLINVENTORYOBSERVERS_H
+
+#include "lluuid.h"
+#include <string>
+#include <vector>
+
+class LLViewerInventoryCategory;
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Class LLInventoryObserver
+//
+// This class is designed to be a simple abstract base class which can
+// relay messages when the inventory changes.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+class LLInventoryObserver
+{
+public:
+	// This enumeration is a way to refer to what changed in a more
+	// human readable format. You can mask the value provided by
+	// chaged() to see if the observer is interested in the change.
+	enum 
+	{
+		NONE = 0,
+		LABEL = 1,			// name changed
+		INTERNAL = 2,		// internal change, eg, asset uuid different
+		ADD = 4,			// something added
+		REMOVE = 8,			// something deleted
+		STRUCTURE = 16,		// structural change, eg, item or folder moved
+		CALLING_CARD = 32,	// online, grant status, cancel, etc change
+		ALL = 0xffffffff
+	};
+	virtual ~LLInventoryObserver() {};
+	virtual void changed(U32 mask) = 0;
+	std::string mMessageName; // used by Agent Inventory Service only. [DEV-20328]
+};
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Class LLInventoryCompletionObserver
+//
+// Class which can be used as a base class for doing something when
+// when all observed items are locally complete. This class implements
+// the changed() method of LLInventoryObserver and declares a new
+// method named done() which is called when all watched items have
+// complete information in the inventory model.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+class LLInventoryCompletionObserver : public LLInventoryObserver
+{
+public:
+	LLInventoryCompletionObserver() {}
+	virtual void changed(U32 mask);
+
+	void watchItem(const LLUUID& id);
+
+protected:
+	virtual void done() = 0;
+
+	typedef std::vector<LLUUID> item_ref_t;
+	item_ref_t mComplete;
+	item_ref_t mIncomplete;
+};
+
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Class LLInventoryFetchObserver
+//
+// This class is much like the LLInventoryCompletionObserver, except
+// that it handles all the the fetching necessary. Override the done()
+// method to do the thing you want.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+class LLInventoryFetchObserver : public LLInventoryObserver
+{
+public:
+	LLInventoryFetchObserver() {}
+	virtual void changed(U32 mask);
+
+	typedef std::vector<LLUUID> item_ref_t;
+
+	bool isEverythingComplete() const;
+	void fetchItems(const item_ref_t& ids);
+	virtual void done() = 0;
+
+protected:
+	item_ref_t mComplete;
+	item_ref_t mIncomplete;
+};
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Class LLInventoryFetchDescendentsObserver
+//
+// This class is much like the LLInventoryCompletionObserver, except
+// that it handles fetching based on category. Override the done()
+// method to do the thing you want.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+class LLInventoryFetchDescendentsObserver : public LLInventoryObserver
+{
+public:
+	LLInventoryFetchDescendentsObserver() {}
+	virtual void changed(U32 mask);
+
+	typedef std::vector<LLUUID> folder_ref_t;
+	void fetchDescendents(const folder_ref_t& ids);
+	bool isEverythingComplete() const;
+	virtual void done() = 0;
+
+protected:
+	bool isComplete(LLViewerInventoryCategory* cat);
+	folder_ref_t mIncompleteFolders;
+	folder_ref_t mCompleteFolders;
+};
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Class LLInventoryFetchComboObserver
+//
+// This class does an appropriate combination of fetch descendents and
+// item fetches based on completion of categories and items. Much like
+// the fetch and fetch descendents, this will call done() when everything
+// has arrived.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+class LLInventoryFetchComboObserver : public LLInventoryObserver
+{
+public:
+	LLInventoryFetchComboObserver() : mDone(false) {}
+	virtual void changed(U32 mask);
+
+	typedef std::vector<LLUUID> folder_ref_t;
+	typedef std::vector<LLUUID> item_ref_t;
+	void fetch(const folder_ref_t& folder_ids, const item_ref_t& item_ids);
+
+	virtual void done() = 0;
+
+protected:
+	bool mDone;
+	folder_ref_t mCompleteFolders;
+	folder_ref_t mIncompleteFolders;
+	item_ref_t mCompleteItems;
+	item_ref_t mIncompleteItems;
+};
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Class LLInventoryExistenceObserver
+//
+// This class is used as a base class for doing somethign when all the
+// observed item ids exist in the inventory somewhere. You can derive
+// a class from this class and implement the done() method to do
+// something useful.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+class LLInventoryExistenceObserver : public LLInventoryObserver
+{
+public:
+	LLInventoryExistenceObserver() {}
+	virtual void changed(U32 mask);
+
+	void watchItem(const LLUUID& id);
+
+protected:
+	virtual void done() = 0;
+
+	typedef std::vector<LLUUID> item_ref_t;
+	item_ref_t mExist;
+	item_ref_t mMIA;
+};
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Class LLInventoryAddedObserver
+//
+// This class is used as a base class for doing something when 
+// a new item arrives in inventory.
+// It does not watch for a certain UUID, rather it acts when anything is added
+// Derive a class from this class and implement the done() method to do
+// something useful.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+class LLInventoryAddedObserver : public LLInventoryObserver
+{
+public:
+	LLInventoryAddedObserver() : mAdded() {}
+	virtual void changed(U32 mask);
+
+protected:
+	virtual void done() = 0;
+
+	typedef std::vector<LLUUID> item_ref_t;
+	item_ref_t mAdded;
+};
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Class LLInventoryTransactionObserver
+//
+// Class which can be used as a base class for doing something when an
+// inventory transaction completes.
+//
+// *NOTE: This class is not quite complete. Avoid using unless you fix up it's
+// functionality gaps.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+class LLInventoryTransactionObserver : public LLInventoryObserver
+{
+public:
+	LLInventoryTransactionObserver(const LLTransactionID& transaction_id);
+	virtual void changed(U32 mask);
+
+protected:
+	typedef std::vector<LLUUID> folder_ref_t;
+	typedef std::vector<LLUUID> item_ref_t;
+	virtual void done(const folder_ref_t& folders, const item_ref_t& items) = 0;
+
+	LLTransactionID mTransactionID;
+};
+
+
+#endif // LL_LLINVENTORYOBSERVERS_H
+