package bluej.utility.javafx.binding;

import java.util.stream.Stream;

import javafx.collections.ObservableList;




| Binds a destination list to the concatenation of an observable list of observable lists.
|
public class ConcatListBinding<T> extends DeepListBinding<T>{    
   private final ObservableList<ObservableList<? extends T>> src;

   
   public static  void bind(ObservableList<T> dest, ObservableList<ObservableList<? extends T>> src)
   {        
      new ConcatListBinding<>(dest, src).startListening();     
      }
    
   
   private ConcatListBinding(ObservableList<T> dest, ObservableList<ObservableList<? extends T>> src)
   {
      super(dest);
       
      this.src = src;     
      }

   
   @Override
   
   protected Stream> getListenTargets()
   {
      return Stream.concat(Stream.of((ObservableList<?>)src), src.stream());     
      }

   
   @Override
   
   protected Stream calculateValues()
   {
      return src.stream().flatMap(ObservableList::stream);     
      } 
   }