Merge pull request #232 from jwfing/master

fixed: parse negative double wrong with gson lib

Author: jwfing

core/src/main/java/cn/leancloud/gson/NumberDeserializerDoubleAsIntFix.java

@@ -17,6 +17,9 @@ public static Object parsePrecisionNumber(Number num) {
     // here you can handle double int/long values
     // and return any type you want
     // this solution will transform 3.0 float to long values
+    if (Math.floor(num.doubleValue()) != Math.ceil(num.doubleValue())) {
+      return num;
+    }
     double doubleValue = Math.ceil(num.doubleValue());
     if (doubleValue == num.intValue()) {
       return num.intValue();

core/src/test/java/cn/leancloud/json/GsonCommonTest.java

@@ -149,6 +149,14 @@ public void testDoubleAndLong() {
     System.out.println(responses.toString());
   }
 
+  public void testNumberParser() {
+    Number numbers[] = {3, 4.5, 5.0, -0, 0.0, 0.0002, -0.0002, -5, -6.5};
+    for (Number num: numbers) {
+      System.out.println("original: " + num + ", floor: " + Math.floor(num.doubleValue()) + ", ceil: " + Math.ceil(num.doubleValue())
+              + ", parsed: " + NumberDeserializerDoubleAsIntFix.parsePrecisionNumber(num));
+    }
+  }
+
   public void testAppAccessEndpoint() {
     String text = "{\"ttl\":3600,\"stats_server\":\"https://stats_server\", \"push_server\": \"https://push_server\"," +
             " \"rtm_router_server\": \"https://rtm_router_server\", \"api_server\": \"https://api_server\"," +