/**
 * A utility class that can be used to calculate state taxes.
 *
 * In this case, there is a sales tax on all items but
 * (non-prepared) food has a special exemption.
 *
 *
 * This work complies with the JMU Honor Code.
 *
 * @author  Jonn Callahan
 * @version 1.0 9/14/08
 */
public class StateTaxes
{
    private static double FOOD_EXEMPTION_RATE = 0.02;
    private static double SALES_TAX_RATE      = 0.05;
    

    /**
     * Calculate the exemption on (non-prepared) food
     *
     * @param value   The value of the (non-prepared) food
     * @return        The exemption (in dollars)
     */
    public static double foodExemption(double value)
    {
       double   exemption;
       exemption=0.0;
       
       exemption = value*FOOD_EXEMPTION_RATE;
	   if (exemption<0)
	      exemption=0.0;

       return exemption;       
    }//end method


    /**
     * Calculate the tax on (non-prepared) food.
     *
     * The food tax is the sales tax less the food exemption.
     *
     * @param value   The value of the (non-prepared) food
     * @return        The tax (in dollars)
     */
    public static double foodTax(double value)
    {
       double   tax;

       tax = salesTax(value)-foodExemption(value);
       if (tax<0)
       	  tax=0.0;
       
       return tax;       
    }//end method
    


    /**
     * Calculate the sales tax.
     *
     * @param value   The value of the items
     * @return        The tax (in dollars)
     */
    public static double salesTax(double value)
    {
       double    tax;
            
       if(value>=.20)
       	  tax=value*SALES_TAX_RATE;
       else
       	  tax=0.0;

       return tax;       
    }//end method
}//end class