/**
    *
    */
   package eu.fbk.dkm.pikes.resources.reader;
   
   import java.util.ArrayList;
   import java.util.HashMap;
   
   
  public class DataElementNode extends DataNode {
  	public String name;
  	public HashMap<String, String> attributes = new HashMap(0);
  	public ArrayList<DataNode> children = new ArrayList(0);
  
  	DataElementNode(String name) {
  		this.name = name;
  	}
  
  	public String getText() {
  		if (!name.equals("__ROOT__")) {
  			throw new IllegalArgumentException("may only call on root node");
  		}
  		//if(children.size() != 1)
  		//throw new IllegalArgumentException("must contain single text node: node = " + this);
  		StringBuilder out = new StringBuilder();
  
  		for (DataNode n : children) {
  			if (!(n instanceof DataTextNode)) {
  				throw new IllegalArgumentException("must contain only text nodes");
  			}
  			out.append(((DataTextNode) n).text);
  		}
  		return out.toString();
  	}
  
  	public String getTopAttribute(String key) {
  		if (!name.equals("__ROOT__")) {
  			throw new IllegalArgumentException("may only call on root node");
  		}
  		if (children.size() != 1) {
  			throw new IllegalArgumentException("must contain single element node: node = " + this);
  		}
  		DataNode n = children.get(0);
  
  		if (!(n instanceof DataElementNode)) {
  			throw new IllegalArgumentException("must contain single element node");
  		}
  		return ((DataElementNode) n).attributes.get(key);
  	}
  
  	public String getTopName(String key) {
  		if (!name.equals("__ROOT__")) {
  			throw new IllegalArgumentException("may only call on root node");
  		}
  		if (children.size() != 1) {
  			throw new IllegalArgumentException("must contain single element node: node = " + this);
  		}
  		DataNode n = children.get(0);
  
  		if (!(n instanceof DataElementNode)) {
  			throw new IllegalArgumentException("must contain single element node");
  		}
  		return ((DataElementNode) n).name;
  	}
  
  	@Override
  	public String toString() {
  		return "DataElementNode{" +
  				"name='" + name + '\'' +
  				", attributes=" + attributes +
  				", children=" + children +
  				'}';
  	}
  }