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// compilation unit Tree.nice
package openclassdispatch;

public class Tree<T> {   
   private !T value;

// internal implementation of prettyPrinting to 
// measure regular dispatch speed

// Unlike MultiJava, in Nice there's no difference
// to methods defined externally -  like prettyPrint

   public String internalPrettyPrint(String prefix);
   internalPrettyPrint(prefix) = 
      prefix + this.getValue().toString + "\n";

   public String internalPrettyPrint();
   internalPrettyPrint() = this.internalPrettyPrint("");

   public !T getValue() = value;   
}

// compilation unit Interior.nice
package openclassdispatch;

public class Interior<T> extends Tree {
   private Tree<T> left;
   private Tree<T> right;

// internal implementation of prettyPrinting to 
// measure regular dispatch speed

// Unlike MultiJava, in Nice there's no difference
// to methods defined externally - like prettyPrint

   internalPrettyPrint(prefix) {
      let result = new StringBuffer( prefix + this.getValue() + "\n" );
      let newPrefix = prefix + "| ";
      result.append( this.getLeft().internalPrettyPrint( newPrefix ) );
      result.append( this.getRight().internalPrettyPrint( newPrefix ) );
      return result.toString;
   }

   public Tree<T> getLeft() = left;
   public Tree<T> getRight() = right;
}

// compilation unit MultiInterior.nice
package openclassdispatch;

public class MultiInterior<T> extends Tree {
   private Tree<T>[] children ;

   public Tree<T>[] getChildren() = children;

   prettyPrint(prefix) {
      let result = new StringBuffer( prefix + this.value() + "\n" );
      let newPrefix = prefix + "| ";
      for (each : children) 
         result.append( each.prettyPrint( newPrefix ) );
      return result.toString;
   }

   dispatchTest() {
      for (each : children) each.dispatchTest;
   }

   size(){
      var count = 1;
      for (each : this.children) count += each.size; 
      return count;
   }
}