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      1 package ds.tree;
      2 
      3 
      4 /**
      5  * A simple standard implementation for a {@link visitor}.
      6  *
      7  * @author Dennis Heidsiek
      8  * @param <T,R>
      9  */
     10 public abstract class VisitorImpl<T, R> implements Visitor<T, R> {
     11 
     12     protected R result;
     13 
     14 	public VisitorImpl() {
     15 		this.result = null;
     16 	}
     17 
     18 	public VisitorImpl(R initialValue) {
     19 		this.result = initialValue;
     20 	}
     21 
     22 	public R getResult() {
     23 		return result;
     24 	}
     25 
     26 	abstract public void visit(String key, RadixTreeNode<T> parent, RadixTreeNode<T> node);
     27 }