question: private void addParents ( Lop node , ArrayList < Lop > node_v , ArrayList < Lop > exec_n ) { for ( Lop enode : exec_n ) { if ( isChild ( node , enode , IDMap ) ) { if ( ! node_v . contains ( enode ) ) { if ( LOG . isTraceEnabled ( ) ) LOG . trace ( "Adding parent - " + enode . toString ( ) ) ; node_v . add ( enode ) ; } } } }
target:  Method to add all parents of "node" in exec_n to node_v.