/*
 * Created on Jul 25, 2005
 *
 */
package aima.learning.inductive;

import aima.learning.framework.Example;
import aima.util.Util;

public class ConstantDecisonTree extends DecisionTree {
	//represents leaf nodes like "Yes"  or "No"
	private String value;

	public ConstantDecisonTree(String value){
		this.value = value;
	}
	public void addLeaf(String attributeValue,String decision){
		throw new RuntimeException("cannot add Leaf to ConstantDecisonTree");
	}
	
	public void addNode(String attributeValue,DecisionTree tree){
		throw new RuntimeException("cannot add Node to ConstantDecisonTree");
	}
	
	public Object predict(Example e){
		return value;
	}
	public String toString(){
		return "DECISION -> " +value;
	}
	public String toString(int depth, StringBuffer buf) {
		buf.append(Util.ntimes("\t",depth+1));
		buf.append("DECISION -> " +value+"\n");
		return buf.toString();
	}
}