HBASE-884 Double and float converters for Bytes class

git-svn-id: https://svn.apache.org/repos/asf/hadoop/hbase/trunk@698090 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -15,6 +15,8 @@ Release 0.19.0 - Unreleased
                new table (Sishen Freecity via Stack)
    HBASE-886, HBASE-895 Sort the tables in the web UI, [shell] 'list' command
                should emit a sorted list of tables (Krzysztof Szlapinski via Stack)
+   HBASE-884   Double and float converters for Bytes class
+               (Doğacan Güney via Stack)
 
   NEW FEATURES
 

src/java/org/apache/hadoop/hbase/util/Bytes.java

@@ -27,6 +27,16 @@ public class Bytes {
    * Size of int in bytes
    */
   public static final int SIZEOF_INT = Integer.SIZE/Byte.SIZE;
+  
+  /**
+   * Size of float in bytes
+   */
+  public static final int SIZEOF_FLOAT = Float.SIZE/Byte.SIZE;
+  
+  /**
+   * Size of double in bytes
+   */
+  public static final int SIZEOF_DOUBLE = Double.SIZE/Byte.SIZE;
 
   /**
    * Pass this to TreeMaps where byte [] are keys.
@@ -143,6 +153,52 @@ public class Bytes {
     }
     return ByteBuffer.wrap(bytes).getInt();
   }
+  
+  /**
+   * Convert an float value to a byte array
+   * @param val
+   * @return the byte array
+   */
+  public static byte[] toBytes(final float val) {
+    ByteBuffer bb = ByteBuffer.allocate(SIZEOF_FLOAT);
+    bb.putFloat(val);
+    return bb.array();
+  }
+
+  /**
+   * Converts a byte array to a float value
+   * @param bytes
+   * @return the float value
+   */
+  public static float toFloat(byte[] bytes) {
+    if (bytes == null || bytes.length == 0) {
+      return -1;
+    }
+    return ByteBuffer.wrap(bytes).getFloat();
+  }
+
+  /**
+   * Convert an double value to a byte array
+   * @param val
+   * @return the byte array
+   */
+  public static byte[] toBytes(final double val) {
+    ByteBuffer bb = ByteBuffer.allocate(SIZEOF_DOUBLE);
+    bb.putDouble(val);
+    return bb.array();
+  }
+
+  /**
+   * Converts a byte array to a double value
+   * @param bytes
+   * @return the double value
+   */
+  public static double toDouble(byte[] bytes) {
+    if (bytes == null || bytes.length == 0) {
+      return -1;
+    }
+    return ByteBuffer.wrap(bytes).getDouble();
+  }
 
   /**
    * @param left