question: public boolean addCall ( String sourceClass , String sourceMethod , String targetClass , String targetMethod ) { CallGraphEntry from = new CallGraphEntry ( targetClass , targetMethod ) ; CallGraphEntry to = new CallGraphEntry ( sourceClass , sourceMethod ) ; if ( sourceClass . equals ( className ) ) cutNodes . add ( to ) ; if ( ! graph . containsEdge ( from , to ) ) { graph . addEdge ( from , to ) ; callGraphClasses . add ( targetClass . replaceAll ( "/" , "." ) ) ; return true ; } return false ; }
target:  add call to the call graph