getItemId.java

class ConcatAdapterController implements NestedAdapterWrapper.Callback {

    ..
    public long getItemId(int globalPosition) {
        WrapperAndLocalPosition wrapperAndPos = findWrapperAndLocalPosition(globalPosition);
        Long globalItemId = wrapperAndPos.mWrapper.getItemId(wrapperAndPos.mLocalPosition);
        releaseWrapperAndLocalPosition(wrapperAndPos);
        return globalItemId;
    }
  ..

}