implemented convertUnits

src/main/java/jota/utils/IotaUnitConverter.java

@@ -0,0 +1,16 @@
+package jota.utils;
+
+/**
+ * Created by pinpong on 30.11.16.
+ */
+public class IotaUnitConverter {
+
+    public static long convertUnits(long amount, IotaUnits fromUnit, IotaUnits toUnit) {
+        long amountInSource = (long) (amount * Math.pow(10, fromUnit.getValue()));
+        return convertUnits(amountInSource, toUnit);
+    }
+
+    private static long convertUnits(long amount, IotaUnits toUnit) {
+        return (long) (amount / Math.pow(10, toUnit.getValue()));
+    }
+}

src/main/java/jota/utils/IotaUnits.java

@@ -0,0 +1,29 @@
+package jota.utils;
+
+/**
+ * Created by pinpong on 30.11.16.
+ */
+public enum IotaUnits {
+    IOTA("i", 0),
+    KILO_IOTA("Ki", 3),
+    MEGA_IOTA("Mi", 6),
+    GIGA_IOTA("Gi", 9),
+    TERRA_IOTA("Ti", 12),
+    PETA_IOTA("Pi", 15);
+
+    private String unit;
+    private long value;
+
+    IotaUnits(String unit, long value) {
+        this.unit = unit;
+        this.value = value;
+    }
+
+    public String getUnit() {
+        return unit;
+    }
+
+    public long getValue() {
+        return value;
+    }
+}

src/test/java/jota/IotaUnitConverterTest.java

@@ -0,0 +1,39 @@
+package jota;
+
+import jota.utils.IotaUnitConverter;
+import jota.utils.IotaUnits;
+import org.hamcrest.core.IsNull;
+import org.junit.Test;
+
+import static org.junit.Assert.assertThat;
+
+/**
+ * Created by pinpong on 30.11.16.
+ */
+public class IotaUnitConverterTest {
+
+    @Test
+    public void shouldConvertUnitItoKi() {
+        assertThat(IotaUnitConverter.convertUnits(1000, IotaUnits.IOTA, IotaUnits.KILO_IOTA), IsNull.notNullValue());
+    }
+
+    @Test
+    public void shouldConvertUnitKiToMi() {
+        assertThat(IotaUnitConverter.convertUnits(1000, IotaUnits.KILO_IOTA, IotaUnits.MEGA_IOTA), IsNull.notNullValue());
+    }
+
+    @Test
+    public void shouldConvertUnitMiToGi() {
+        assertThat(IotaUnitConverter.convertUnits(1000, IotaUnits.MEGA_IOTA, IotaUnits.GIGA_IOTA), IsNull.notNullValue());
+    }
+
+    @Test
+    public void shouldConvertUnitGiToTi() {
+        assertThat(IotaUnitConverter.convertUnits(1000, IotaUnits.GIGA_IOTA, IotaUnits.TERRA_IOTA), IsNull.notNullValue());
+    }
+
+    @Test
+    public void shouldConvertUnitTiToPi() {
+        assertThat(IotaUnitConverter.convertUnits(1000, IotaUnits.TERRA_IOTA, IotaUnits.PETA_IOTA), IsNull.notNullValue());
+    }
+}