public WakeLockMetrics diff()

in metrics/src/main/java/com/facebook/battery/metrics/wakelock/WakeLockMetrics.java [79:103]

• 23 lines of code
• 7 McCabe index (conditional complexity)

  public WakeLockMetrics diff(@Nullable WakeLockMetrics b, @Nullable WakeLockMetrics output) {
    if (output == null) {
      output = new WakeLockMetrics(isAttributionEnabled);
    }

    if (b == null) {
      output.set(this);
    } else {
      output.heldTimeMs = heldTimeMs - b.heldTimeMs;
      output.acquiredCount = acquiredCount - b.acquiredCount;
      if (output.isAttributionEnabled) {
        output.tagTimeMs.clear();
        for (int i = 0, size = tagTimeMs.size(); i < size; i++) {
          String tag = tagTimeMs.keyAt(i);
          Long currentTimeMs = b.tagTimeMs.get(tag);
          long difference = tagTimeMs.valueAt(i) - (currentTimeMs == null ? 0 : currentTimeMs);
          if (difference != 0) {
            output.tagTimeMs.put(tag, difference);
          }
        }
      }
    }

    return output;
  }