public static T nullOf()

in google-http-client/src/main/java/com/google/api/client/util/Data.java [109:143]

32 lines of code
6 McCabe index (conditional complexity)


  public static <T> T nullOf(Class<?> objClass) {
    Object result = NULL_CACHE.get(objClass);
    if (result == null) {
      synchronized (NULL_CACHE) {
        result = NULL_CACHE.get(objClass);
        if (result == null) {
          if (objClass.isArray()) {
            // arrays are special because we need to compute both the dimension and component type
            int dims = 0;
            Class<?> componentType = objClass;
            do {
              componentType = componentType.getComponentType();
              dims++;
            } while (componentType.isArray());
            result = Array.newInstance(componentType, new int[dims]);
          } else if (objClass.isEnum()) {
            // enum requires look for constant with @NullValue
            FieldInfo fieldInfo = ClassInfo.of(objClass).getFieldInfo(null);
            Preconditions.checkNotNull(
                fieldInfo, "enum missing constant with @NullValue annotation: %s", objClass);
            @SuppressWarnings({"unchecked", "rawtypes"})
            Enum e = fieldInfo.<Enum>enumValue();
            result = e;
          } else {
            // other classes are simpler
            result = Types.newInstance(objClass);
          }
          NULL_CACHE.put(objClass, result);
        }
      }
    }
    @SuppressWarnings("unchecked")
    T tResult = (T) result;
    return tResult;
  }