#include "hash.h"

subExceptionDef( HashException )

template<> uint32_t __calcHashCode<int>( const int &k )
{
	return k;
}

template<> bool __cmpHashKeys<int>( const int &a, const int &b )
{
	return a == b;
}

template<> uint32_t __calcHashCode<unsigned int>( const unsigned int &k )
{
	return k;
}

template<> bool __cmpHashKeys<unsigned int>( const unsigned int &a, const unsigned int &b )
{
	return a == b;
}

template<>
uint32_t __calcHashCode<const char *>( const char * const &k )
{
	if (k == NULL)
	{
		return 0;
	}
	
	unsigned long int nPos = 0;
	for( const char *s = k; *s; s++ )
	{
		nPos = *s + (nPos << 6) + (nPos << 16) - nPos;
	}

	return nPos;
}

template<> bool __cmpHashKeys<const char *>( const char * const &a, const char * const &b )
{
	if( a == b )
		return true;

	for(int j=0; a[j] == b[j]; j++ )
		if( a[j] == '\0' )
			return true;

	return false;
}

template<>
uint32_t __calcHashCode<char *>( char * const &k )
{
	if (k == NULL)
	{
		return 0;
	}
	
	unsigned long int nPos = 0;
	for( const char *s = k; *s; s++ )
	{
		nPos = *s + (nPos << 6) + (nPos << 16) - nPos;
	}

	return nPos;
}

template<> bool __cmpHashKeys<char *>( char * const &a, char * const &b )
{
	if( a == b )
		return true;

	for(int j=0; a[j] == b[j]; j++ )
		if( a[j] == '\0' )
			return true;

	return false;
}

template<> uint32_t __calcHashCode<std::string>( const std::string &k )
{
	std::string::size_type j, sz = k.size();
	const char *s = k.c_str();

	unsigned long int nPos = 0;
	for( j = 0; j < sz; j++, s++ )
	{
		nPos = *s + (nPos << 6) + (nPos << 16) - nPos;
	}

	return nPos;
}

template<> bool __cmpHashKeys<std::string>( const std::string &a, const std::string &b )
{
	return a == b;
}

template<> uint32_t __calcHashCode<Hashable>( const Hashable &k )
{
	return 0;
	//return k.getHashCode();
}

template<> bool __cmpHashKeys<Hashable>( const Hashable &a, const Hashable &b )
{
	return false;
	//return a.compareForHash( b );
}