question: public void addAll ( T [ ] items ) { if ( mEventDelegate != null ) mEventDelegate . addData ( items == null ? 0 : items . length ) ; if ( items != null && items . length != 0 ) { synchronized ( mLock ) { Collections . addAll ( mObjects , items ) ; } } int dataCount = items == null ? 0 : items . length ; if ( mObserver != null ) mObserver . onItemRangeInserted ( getCount ( ) - dataCount + 1 , dataCount ) ; if ( mNotifyOnChange ) notifyItemRangeInserted ( headers . size ( ) + getCount ( ) - dataCount + 1 , dataCount ) ; log ( "addAll notifyItemRangeInserted " + ( ( headers . size ( ) + getCount ( ) - dataCount + 1 ) + "," + ( dataCount ) ) ) ; }
target:  Adds the specified items at the end of the array.