code: @Override
      public void sawOpcode(final int seen) {
          try {
              stack.precomputation(this);
  
              if (OpcodeUtils.isStandardInvoke(seen)) {
                  String calledClass = getDottedClassConstantOperand();
  
                  if (seen == Const.INVOKEINTERFACE) {
                      int parmCount = SignatureUtils.getNumParameters(this.getSigConstantOperand());
                      if (!countClassAccess(parmCount)) {
                          countClassAccess(calledClass);
                      }
                  } else {
                      countClassAccess(calledClass);
                  }
              } else if (seen == Const.PUTFIELD) {
                  countClassAccess(1);
              } else if (seen == Const.GETFIELD) {
                  countClassAccess(0);
              } else if ((seen == Const.PUTSTATIC) || (seen == Const.GETSTATIC)) {
                  countClassAccess(getDottedClassConstantOperand());
              } else if ((seen == Const.ALOAD_0) && (!methodIsStatic)) {
                  countClassAccess(clsName);
              }
          } finally {
              stack.sawOpcode(this, seen);
          }
      }
docs: overrides the visitor to look for method calls, and populate a class access count map based on the owning class of methods called.
  
  @param seen
  the opcode currently being parsed