package edu.stanford.rt.datatype;

import java.util.*;


/**
 * @author Ninghui Li, Sandra Qiu <br>
 * 
 * Implementation of <code>TreeValue</code> element.
 * 
 */
public class TreeValue implements DataValue
{
    private ArrayList value;
    private TreeType type;

    /**
     * Constructor for TreeValue
     */
    public TreeValue(TreeType type, List v)
        throws IllegalArgumentException
    {
        this.type = type;
       
        if(v == null || v.size() ==0)
            throw new IllegalArgumentException("Empty tree value");

        value = new ArrayList();
        Iterator it = v.iterator();
        while(it.hasNext())
        {
            String val = (String)it.next();
            value.add(val);
        }
    }

	/**
	 * Method getValue.
     *      returns an unmodifiable view of value part list.
	 * @return List
	 */
    public List getValue()
    {
        return Collections.unmodifiableList(value);
    }
    
	/* (non-Javadoc)
	 * @see java.lang.Object#toString()
	 */
    public String toString()
    {
        StringBuffer sb = new StringBuffer();
        String separator = type.getSeparator();
        boolean rootFirst = type.isRootFirst();
        int size = value.size();
        if(rootFirst)
        {
            for(int i=0; i<size; i++)
            {
                String val = (String)value.get(i);
                sb.append(val);
                if(i != (size-1))  sb.append(separator);
            }
        }
        else
        {
            for(int i=size-1; i>=0; i--)
            {
                String val = (String)value.get(i);
                sb.append(val);
                if(i != 0)  sb.append(separator);
            }
        }
        return sb.toString();
    }
    
}