XnStringsHash.h

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/*****************************************************************************
*                                                                            *
*  OpenNI 1.0 Alpha                                                          *
*  Copyright (C) 2010 PrimeSense Ltd.                                        *
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*  This file is part of OpenNI.                                              *
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#ifndef _XN_STRINGS_HASH_H
#define _XN_STRINGS_HASH_H

//---------------------------------------------------------------------------
// Includes
//---------------------------------------------------------------------------
#include "XnHash.h"
#include <XnOS.h>

//---------------------------------------------------------------------------
// Types
//---------------------------------------------------------------------------
class XnStringsKeyManager
{
public:
        static XnHashValue Hash(const XnChar* const& key)
        {
                XnUInt32 nCRC = 0;
                xnOSStrCRC32(key, &nCRC);

                // convert from UINT32 to XnHashValue
                return nCRC % (1 << (sizeof(XnHashValue)*8));
        }

        static XnInt32 Compare(const XnChar* const& key1, const XnChar* const& key2)
        {
                return strcmp(key1, key2);
        }
};

class XnStringsKeyTranslator
{
public:
        static XnValue CreateValueCopy(const XnChar* const& orig)
        {
                // we should copy string, so we can keep the key
                XnUInt32 nLen = strlen(orig) + 1; // with null termination
                XnChar* pcKey = (XnChar*)xnOSMalloc(nLen);
                xnOSStrCopy(pcKey, orig, nLen);
                return (pcKey);
        }

        static void FreeValue(XnValue& Value)
        {
                XnChar* pcKey = (XnChar*)Value;
                xnOSFree(pcKey);
        }

        static XnValue GetAsValue(const XnChar* const& orig)
        {
                return (XnValue)orig;
        }

        static const XnChar* const& GetFromValue(const XnValue& Value)
        {
                return (const XnChar* const&)Value;
        }

        static const XnChar*& GetFromValue(XnValue& Value)
        {
                return (const XnChar*&)Value;
        }
};

#define XN_DECLARE_STRINGS_HASH_WITH_TRANSLATOR_DECL(decl, ValueType, ClassName, ValueTranslator)                                                               \
        XN_DECLARE_HASH_DECL(decl, const XnChar*, ValueType, ClassName, XnStringsKeyTranslator, ValueTranslator, XnStringsKeyManager)   \


#define XN_DECLARE_STRINGS_HASH_WITH_TRANSLATOR(ValueType, ClassName, ValueTranslator)                                                          \
        XN_DECLARE_STRINGS_HASH_WITH_TRANSLATOR_DECL(, ValueType, ClassName, ValueTranslator)

#define XN_DECLARE_STRINGS_HASH_DECL(decl, ValueType, ClassName)                                                                                                                \
        XN_DECLARE_DEFAULT_VALUE_TRANSLATOR_DECL(decl, ValueType, XN_DEFAULT_TRANSLATOR_NAME(ClassName))                                        \
        XN_DECLARE_STRINGS_HASH_WITH_TRANSLATOR_DECL(decl, ValueType, ClassName, XN_DEFAULT_TRANSLATOR_NAME(ClassName)) \


#define XN_DECLARE_STRINGS_HASH(ValueType, ClassName)                           \
        XN_DECLARE_STRINGS_HASH_DECL(, ValueType, ClassName)


XN_DECLARE_STRINGS_HASH(XnValue, XnStringsHash)

#endif //_XN_STRINGS_HASH_H