Converting string bytes sizes to other ordinals

package gamesys.cognos.camel;
 
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.EnumSet;
 
public enum ByteSize {
    BYTE("b"),
    KILO("kb"),
    MEGA("mb"),
    GIGA("gb");
 
    private final String symbol;
    private static final int MULTIPLIER = 1024;
 
    ByteSize(String symbol) {
        this.symbol = symbol;
    }
 
    static double multiply(double d) {
        return d * MULTIPLIER;
    }
 
    static double divide(double d) {
        return d / MULTIPLIER;
    }
 
    public static double convert(String source, ByteSize target) {
        double d = 0;
        EnumSet<ByteSize> allSizes = EnumSet.allOf(ByteSize.class);
 
        ByteSize sourceSize = ByteSize.BYTE;
        String lower = source.toLowerCase();
        for (ByteSize size : allSizes) {
            if (lower.contains(size.symbol)) {
                sourceSize = size;
            }
        }
 
        int range = target.ordinal() - sourceSize.ordinal();
 
        NumberFormat nf = NumberFormat.getNumberInstance();
        try {
            Number number = nf.parse(source);
            d = number.doubleValue();
 
            if (range > 0) {
                for (int i = 0; i < range; i++) {
                    d = ByteSize.divide(d);
                }
            } else if (range < 0) {
                for (int i = 0; i > range; i--) {
                    d = ByteSize.multiply(d);
                }
            }
 
        } catch (ParseException ignore) {
 
        }
 
        return d;
    }
 
}

package gamesys.cognos.camel.route;
 
import gamesys.cognos.camel.ByteSize;
import org.junit.Test;
 
import static junit.framework.Assert.assertEquals;
 
public class ByteSizeUTest {
 
    @Test
    public void testConvert() throws Exception {
        assertEquals(1d, ByteSize.convert("1024", ByteSize.KILO));
        assertEquals(1d, ByteSize.convert("1024b", ByteSize.KILO));
        assertEquals(1d, ByteSize.convert("1048576b", ByteSize.MEGA));
        assertEquals(1d, ByteSize.convert("1,048,576b", ByteSize.MEGA));
        assertEquals(1048576d, ByteSize.convert("1mb", ByteSize.BYTE));
        assertEquals(10240d, ByteSize.convert("10kb", ByteSize.BYTE));
        assertEquals(1024d, ByteSize.convert("1GB", ByteSize.MEGA));
        assertEquals(1d, ByteSize.convert("1,024MB", ByteSize.GIGA));
        assertEquals(1024d, ByteSize.convert("1024kb", ByteSize.KILO));
    }
}

Category: Java