How to use

getFilter

method

in

cofh.core.util.filter.ItemFilterWrapper

public boolean getFlag(int flag) {
  return filterWrapper.getFilter().getFlag(flag);
}

public void setFlag(int flag, boolean value) {
  filterWrapper.getFilter().setFlag(flag, value);
  if (CoreUtils.isClient()) {
    PacketCore.sendFilterPacketToServer(flag, value);
  }
  filterWrapper.markDirty();
}

ItemStack eventItem = event.getItem().getItem();
if (wrapper.getFilter().matches(eventItem)) {
  if (isVoid(stack)) {
    eventItem.setCount(0);