/* Valuation.java
 * 
 * Translated by: Thomas Lauritsen
 *
 * Execise 26 (examination exercise 3 from ITU, January 2000):
 * Calculates tax assessments of real estates.
 */

/* Class RealEstate as given in the text */
class RealEstate {
    House house;
    Site site;

    RealEstate(House house, Site site) {
        this.house = house;
        this.site = site;
    }

    int valuation() {
        return house.valuation() + site.valuation();
    }
}

/* Question 3.1: Class House */
class House {
    int area;
    int costPerSquareMeter;

    House(int area, int costPerSquareMeter) {
        this.area = area;
        this.costPerSquareMeter = costPerSquareMeter;
    }

    int valuation() {
        // Valuation of a house is the area times 
        // the cost per area.
        return area * costPerSquareMeter;
    }
}

/* Question 3.2: Class Site */
class Site {
    int area;
    int costPerSquareMeter;
    int buildingPrivilege;

    Site(int area, int costPerSquareMeter, int buildingPrivilege) {
        this.area = area;
        this.costPerSquareMeter = costPerSquareMeter;
        this.buildingPrivilege = buildingPrivilege;
    }

    int valuation() {
        // Valuation of a site is area times cost per area
        // plus privilege.
        return area * costPerSquareMeter + buildingPrivilege;
    }
}

class Valuation {

    /* Question 3.3: valuation method */
    static int valuation(RealEstate[] estates) {
        // loop through all realestates and sum
        // their valuation.
        int sum = 0;
        for (int i = 0; i < estates.length; i++) {
            sum = sum + estates[i].valuation();
        }
        return sum;
    }

    /* main method as given in the text */
    public static void main(String[] args) {
        RealEstate k29 = 
          new RealEstate(new House(200, 8000), new Site(800, 500, 400000));
        RealEstate a11 = 
          new RealEstate(new House( 70, 4000), new Site(700,  30,  24000));

        RealEstate[] estates = {k29, a11};
        System.out.println(valuation(estates));
    }
}

/* Question 3.4: class PollutedSite */
class PollutedSite extends Site {
    int reduction;

    PollutedSite(int area, int costPerSquareMeter, int buildingPrivilege, 
                 int reduction) {
        // call Site's constructor
        super(area, costPerSquareMeter, buildingPrivilege);

        this.reduction = reduction;
    }

    int valuation() {
        // Valutation of a polluted site is the valuation
        // of a similar unpolluted site minus a reduction.
        return super.valuation() - reduction;
    }

    void setReduction(int reduction) {
        this.reduction = reduction;
    }
}