public static void deepCopy()

in google-http-client/src/main/java/com/google/api/client/util/Data.java [255:320]
59 lines of code
17 McCabe index (conditional complexity)

  public static void deepCopy(Object src, Object dest) {
    Class<?> srcClass = src.getClass();
    Preconditions.checkArgument(srcClass == dest.getClass());
    if (srcClass.isArray()) {
      // clone array
      Preconditions.checkArgument(Array.getLength(src) == Array.getLength(dest));
      int index = 0;
      for (Object value : Types.iterableOf(src)) {
        Array.set(dest, index++, clone(value));
      }
    } else if (Collection.class.isAssignableFrom(srcClass)) {
      // clone collection
      @SuppressWarnings("unchecked")
      Collection<Object> srcCollection = (Collection<Object>) src;
      if (ArrayList.class.isAssignableFrom(srcClass)) {
        @SuppressWarnings("unchecked")
        ArrayList<Object> destArrayList = (ArrayList<Object>) dest;
        destArrayList.ensureCapacity(srcCollection.size());
      }
      @SuppressWarnings("unchecked")
      Collection<Object> destCollection = (Collection<Object>) dest;
      for (Object srcValue : srcCollection) {
        destCollection.add(clone(srcValue));
      }
    } else {
      // clone generic data or a non-map Object
      boolean isGenericData = GenericData.class.isAssignableFrom(srcClass);
      if (isGenericData || !Map.class.isAssignableFrom(srcClass)) {
        ClassInfo classInfo =
            isGenericData ? ((GenericData) src).classInfo : ClassInfo.of(srcClass);
        for (String fieldName : classInfo.names) {
          FieldInfo fieldInfo = classInfo.getFieldInfo(fieldName);
          // skip final fields
          if (!fieldInfo.isFinal()) {
            // generic data already has primitive types copied by clone()
            if (!isGenericData || !fieldInfo.isPrimitive()) {
              Object srcValue = fieldInfo.getValue(src);
              if (srcValue != null) {
                fieldInfo.setValue(dest, clone(srcValue));
              }
            }
          }
        }
      } else if (ArrayMap.class.isAssignableFrom(srcClass)) {
        // clone array map
        @SuppressWarnings("unchecked")
        ArrayMap<Object, Object> destMap = (ArrayMap<Object, Object>) dest;
        @SuppressWarnings("unchecked")
        ArrayMap<Object, Object> srcMap = (ArrayMap<Object, Object>) src;
        int size = srcMap.size();
        for (int i = 0; i < size; i++) {
          Object srcValue = srcMap.getValue(i);
          destMap.set(i, clone(srcValue));
        }
      } else {
        // clone map
        @SuppressWarnings("unchecked")
        Map<String, Object> destMap = (Map<String, Object>) dest;
        @SuppressWarnings("unchecked")
        Map<String, Object> srcMap = (Map<String, Object>) src;
        for (Map.Entry<String, Object> srcEntry : srcMap.entrySet()) {
          destMap.put(srcEntry.getKey(), clone(srcEntry.getValue()));
        }
      }
    }
  }