private CallLocationModel(String clz,int line,Edge edge){
  super(clz,line);
  SootMethod targetMethod=edge.tgt();
  String sig=targetMethod.getSignature();
  targetMethodSig=sig.substring(1,sig.length() - 1);
}

private CallLocationModel ( String clz , int line , Edge edge ) { super ( clz , line ) ; SootMethod targetMethod = edge . tgt ( ) ; String sig = targetMethod . getSignature ( ) ; targetMethodSig = sig . substring ( 1 , sig . length ( ) - 1 ) ; }
create a call edge source line model and compute its fields .
