How to use

com.wizzardo.tools.collections.flow.FlowGroup

constructor

@Override
public void process(B b) {
  K key = toKey.map(b);
  FlowGroup<K, B> group = groups.get(key);
  if (group == null) {
    groups.put(key, group = new FlowGroup<K, B>(key));
    child.process(group);
  }
  group.process(b);
}

@Override
public void process(B b) {
  K key = toKey.map(b);
  FlowGroup<K, B> group = groups.get(key);
  if (group == null) {
    groups.put(key, group = new FlowGroup<K, B>(key));
    child.process(group);
  }
  group.process(b);
}