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#ifndef __JE_COMMON_SREINGMAP_H__
#define __JE_COMMON_SREINGMAP_H__
#include "object.h"
namespace JinEngine
{
template<typename T, unsigned SIZE>
class StringMap : public Object
{
private:
struct Record
{
const char * key;
T value;
bool set;
Record() : set(false) {}
};
const static unsigned MAX = SIZE * 2;
Record records[MAX];
const char * reverse[SIZE];
public:
struct Entry
{
const char * key;
T value;
};
StringMap(Entry * entries, unsigned num)
{
for (unsigned i = 0; i < SIZE; ++i)
reverse[i] = 0;
unsigned n = num / sizeof(Entry);
for (unsigned i = 0; i < n; ++i)
{
add(entries[i].key, entries[i].value);
}
}
bool streq(const char * a, const char * b)
{
while (*a != 0 && *b != 0)
{
if (*a != *b)
return false;
++a;
++b;
}
return (*a == 0 && *b == 0);
}
bool find(const char * key, T & t)
{
//unsigned str_hash = djb2(key);
for (unsigned i = 0; i < MAX; ++i)
{
//unsigned str_i = (str_hash + i) % MAX; //this isn't used, is this intentional?
if (records[i].set && streq(records[i].key, key))
{
t = records[i].value;
return true;
}
}
return false;
}
bool find(T key, const char *& str)
{
unsigned index = (unsigned)key;
if (index >= SIZE)
return false;
if (reverse[index] != 0)
{
str = reverse[index];
return true;
}
else
{
return false;
}
}
bool add(const char * key, T value)
{
unsigned str_hash = djb2(key);
bool inserted = false;
for (unsigned i = 0; i < MAX; ++i)
{
unsigned str_i = (str_hash + i) % MAX;
if (!records[str_i].set)
{
inserted = true;
records[str_i].set = true;
records[str_i].key = key;
records[str_i].value = value;
break;
}
}
unsigned index = (unsigned)value;
if (index >= SIZE)
{
printf("\nConstant %s out of bounds with %i!\n", key, index);
return false;
}
reverse[index] = key;
return inserted;
}
unsigned djb2(const char * key)
{
unsigned hash = 5381;
int c;
while ((c = *key++))
hash = ((hash << 5) + hash) + c;
return hash;
}
}; // StringMap
} // namespace JinEngine
#endif
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