///////    File: RateTable.C   ///////

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

Rate RateTable::_table[] = 
    { Rate ("Britan (Pound)",   0.5905), 
      Rate ("Canada (Dollar)",  1.1802),
      Rate ("Germany (Mark)",   1.6760), 
      Rate ("Italy (Lira)",  1233.50),  
      Rate ("Japan (Yen)",    151.17),     
      Rate ("Mexico (Peso)", 2827.01),  
      Rate ("Spain (Peseta)", 104.15),  
      Rate ("Taiwan (NT $)",   24.0) };
      
unsigned RateTable::_len =
    sizeof (RateTable::_table) / sizeof (Rate);



// table lookup with binary search
    
int RateTable::Lookup (char *cur) {
    int low = 0, high = _len - 1;
    int mid, test;
    
    while (low <= high) {
        mid = (high + low) / 2;
        test = strcmp (cur, _table[mid].GetName());
        
        if (test == 0) {   // found a match
            return (mid);
        } else if (test > 0) {
            low = mid + 1;
        } else {
            high = mid - 1;
        }
    }
    return (-1);   // entry not on rate table
}



double RateTable::GetRate (char *cur) {
    int index = Lookup (cur);
    if (index > -1) {
        return (_table[index].GetRate());
    } else {
        return (0.0);   // no exchange rate
    }
}
   
int RateTable::SetRate (char *cur, double r) {
    int index = Lookup (cur);
    if (index > -1) {
       _table[index].SetRate (r);
       return (0);
    } else {
       return (-1);   // lookup failed
    }
}







void RateTable::Display (char *cur) {
    int index = Lookup (cur);
    if (index > -1) {
        _table[index].Display();
    } else {
        cout << cur << " not found" << endl;
    }
}

void RateTable::Display() {
    for (int i = 0; i < _len; i++) {
       _table[i].Display();
    }
}