question: public boolean hasDescendant ( Pattern pattern ) { Queue < BNode > nodesToProcess = new LinkedList < BNode > ( ) ; nodesToProcess . add ( this ) ; while ( ! nodesToProcess . isEmpty ( ) ) { BNode currentNode = nodesToProcess . poll ( ) ; for ( BNode descendantNode : currentNode . getOutputNodes ( ) ) { Matcher matcher = pattern . matcher ( descendantNode . getId ( ) ) ; if ( matcher . matches ( ) ) { return true ; } if ( ! nodesToProcess . contains ( descendantNode ) ) { nodesToProcess . add ( descendantNode ) ; } } } return false ; }
target:  Returns true if at there exists at least one descendant whose identifier matches the regular expression pattern, and false otherwise