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/** 
* @file   llmaterialid.h
* @brief  Header file for llmaterialid
* @author Stinson@lindenlab.com
*
* $LicenseInfo:firstyear=2012&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2012, 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_LLMATERIALID_H
#define LL_LLMATERIALID_H

#define MATERIAL_ID_SIZE 16

#include <string>
#include "llsd.h"

class LLMaterialID
{
public:
	LLMaterialID();
	LLMaterialID(const LLSD& pMaterialID);
	LLMaterialID(const LLSD::Binary& pMaterialID);
	LLMaterialID(const void* pMemory);
	LLMaterialID(const LLMaterialID& pOtherMaterialID);
	LLMaterialID(const LLUUID& lluid);
	~LLMaterialID();

	bool          operator == (const LLMaterialID& pOtherMaterialID) const;
	bool          operator != (const LLMaterialID& pOtherMaterialID) const;

	bool          operator < (const LLMaterialID& pOtherMaterialID) const;
	bool          operator <= (const LLMaterialID& pOtherMaterialID) const;
	bool          operator > (const LLMaterialID& pOtherMaterialID) const;
	bool          operator >= (const LLMaterialID& pOtherMaterialID) const;

	LLMaterialID& operator = (const LLMaterialID& pOtherMaterialID);

	bool          isNull() const;

	const U8*     get() const;
	void          set(const void* pMemory);
	void          clear();

	LLSD          asLLSD() const;
	std::string   asString() const;

	friend std::ostream& operator<<(std::ostream& s, const LLMaterialID &material_id);

	static const LLMaterialID null;

	// Returns a 64 bits digest of the material Id, by XORing its two 64 bits
	// long words. HB
	inline U64 getDigest64() const
	{
		U64* tmp = (U64*)mID;
		return tmp[0] ^ tmp[1];
	}

private:
	void parseFromBinary(const LLSD::Binary& pMaterialID);
	void copyFromOtherMaterialID(const LLMaterialID& pOtherMaterialID);
	int  compareToOtherMaterialID(const LLMaterialID& pOtherMaterialID) const;

	U8 mID[MATERIAL_ID_SIZE];
} ;

// std::hash implementation for LLMaterialID
namespace std
{
	template<> struct hash<LLMaterialID>
	{
		inline size_t operator()(const LLMaterialID& id) const noexcept
		{
			return (size_t)id.getDigest64();
		}
	};
}

// For use with boost containers.
inline size_t hash_value(const LLMaterialID& id) noexcept
{
	return (size_t)id.getDigest64();
}

#endif // LL_LLMATERIALID_H