Add toFloat/Double

Author: patrickfav

CHANGELOG

@@ -1,5 +1,9 @@
 # Releases
 
+## v0.4.3
+
+* add toFloat/toDouble
+
 ## v0.4.2
 
 * add check method if transformer supports inplace

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>at.favre.lib</groupId>
     <artifactId>bytes</artifactId>
-    <version>0.4.2</version>
+    <version>0.4.3</version>
     <packaging>jar</packaging>
 
     <name>Bytes Utility Library</name>

src/main/java/at/favre/lib/bytes/Bytes.java

@@ -1319,6 +1319,37 @@ public long toLong() {
         return resize(8).internalBuffer().getLong();
     }
 
+    /**
+     * If the underlying byte array is smaller than or equal to 4 byte / 32 bit returns the
+     * representation for a Java float value. The output is dependent on the set {@link #byteOrder()}.
+     *
+     * @return the float representation
+     * @throws UnsupportedOperationException if byte array is longer than 4 byte
+     * @see <a href="https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html">Primitive Types</a>
+     */
+    public float toFloat() {
+        if (length() > 4) {
+            throw new UnsupportedOperationException("cannot convert to float if length > 4 byte");
+        }
+        return resize(4).internalBuffer().getFloat();
+    }
+
+    /**
+     * If the underlying byte array is smaller than or equal to 8 byte / 64 bit returns the
+     * representation for a Java float value. The output is dependent on the set {@link #byteOrder()}.
+     *
+     * @return the float representation
+     * @throws UnsupportedOperationException if byte array is longer than 8 byte
+     * @see <a href="https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html">Primitive Types</a>
+     */
+    public double toDouble() {
+        if (length() > 8) {
+            throw new UnsupportedOperationException("cannot convert to float if length > 8 byte");
+        }
+        return resize(8).internalBuffer().getDouble();
+    }
+
+
     /**
      * Compares this bytes instance to another.
      * <p>

src/test/java/at/favre/lib/bytes/BytesToConvertOtherTypesTest.java

@@ -146,4 +146,36 @@ public void toLong() throws Exception {
         } catch (UnsupportedOperationException e) {
         }
     }
+
+    @Test
+    public void toFloat() throws Exception {
+        assertEquals(1.0134550690550691E-17, Bytes.from(example_bytes_four).toFloat(), 0.001);
+
+        assertEquals(5.1E-322, Bytes.from(example_bytes_one).toFloat(), 0.001);
+        assertEquals(3.3433E-320, Bytes.from(example_bytes_two).toFloat(), 0.001);
+        assertEquals(0, Bytes.from(new byte[2]).toFloat(), 0);
+        assertEquals(0, Bytes.from(new byte[4]).toFloat(), 0);
+
+        try {
+            Bytes.from(new byte[5]).toFloat();
+            fail();
+        } catch (UnsupportedOperationException e) {
+        }
+    }
+
+    @Test
+    public void toDouble() throws Exception {
+        assertEquals(-6.659307728279082E225, Bytes.from(example_bytes_eight).toDouble(), 0.001);
+
+        assertEquals(5.1E-322, Bytes.from(example_bytes_one).toDouble(), 0.001);
+        assertEquals(3.3433E-320, Bytes.from(example_bytes_two).toDouble(), 0.001);
+        assertEquals(0, Bytes.from(new byte[4]).toDouble(), 0);
+        assertEquals(0, Bytes.from(new byte[8]).toDouble(), 0);
+
+        try {
+            Bytes.from(new byte[9]).toDouble();
+            fail();
+        } catch (UnsupportedOperationException e) {
+        }
+    }
 }