areaunit.java

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package ranab.unit;

/**
 * Area unit converter class.
 *
 * @author <a href="mailto:[e-mail]">Rana Bhattacharyya</a>
 */
public 
class AreaUnit extends BaseUnit {
    
    private final static String[] UNITS = {
        "square inches", 
        "square feet", 
        "square yards", 
        "square miles",
        "acres",
        "square cm",
        "square meters",
        "square km",
        "hectares"
    }; 
    
    // base weight unit is square meters
    private final static double[] M2_TABLE = {
        1550.0031000062001,
        10.763910416709722,
        1.1959900463010802,
        3.8610215854781256e-7,
        0.0002471053814671653,
        10000,    
        1,    
        0.000001,
        0.0001
    };
    
    /**
     * Get all the possible units.
     */
    public String[] getAllUnits() {
        return UNITS;
    }
    
    /**
     * Convert one unit from another
     */
    public String convertUnit(String value, int from, int to) throws UnitException {
        double inVal = getDoubleValue(value);
        double outVal = inVal*M2_TABLE[to]/M2_TABLE[from];
        return String.valueOf(outVal);
    }
    
    /**
     * Return unit type.
     */
    public String toString() {
        return "Area";
    }
    
}