Added support for reading $numberLong in extended JSON

JAVA-1272

Author: rozza

src/main/com/mongodb/util/JSONCallback.java

@@ -114,6 +114,8 @@ public Object objectDone() {
             int type = (Integer) b.get("$type");
             byte[] bytes = (new Base64Codec()).decode((String) b.get("$binary"));
             o = new Binary((byte) type, bytes);
+        } else if (b.containsField("$numberLong")) {
+            o = Long.valueOf((String) b.get("$numberLong"));
         }
 
         if (!isStackEmpty()) {

src/test/com/mongodb/util/JSONCallbackTest.java

@@ -121,6 +121,12 @@ public void refParsing() {
         assertEquals(ref.getId(), new ObjectId("01234567890123456789abcd").toHexString());
     }
 
+    @Test
+    public void numberLongParsing() {
+        Long number = (Long) JSON.parse(("{ \"$numberLong\" : \"123456\" }"));
+        assertEquals(number, Long.valueOf("123456"));
+    }
+
 // No such concept in Java
 //    @Test
 //    public void undefinedParsing() {