code: public InnerClassAccess getInnerClassAccess(INVOKESTATIC inv, ConstantPoolGen cpg) throws ClassNotFoundException {
          String methodName = inv.getMethodName(cpg);
          if (methodName.startsWith("access$")) {
              String className = inv.getClassName(cpg);
  
              return getInnerClassAccess(className, methodName);
          }
          return null;
      }
docs: Get the inner class access object for given invokestatic instruction.
  Returns null if the called method is not an inner class access.
  
  @param inv
  the invokestatic instruction
  @param cpg
  the ConstantPoolGen for the method
  @return the InnerClassAccess, or null if the call is not an inner class
  access