code: public void addMethodLine(String className, String methodName, String methodSignature, SourceLineRange range) {
          methodLineMap.put(new MethodDescriptor(className, methodName, methodSignature), range);
      }
docs: Add a line number entry for a method.
  
  @param className
  name of class containing the method
  @param methodName
  name of method
  @param methodSignature
  signature of method
  @param range
  the line number of the method