package pt.linkare.ant.propreaders;

import java.io.UnsupportedEncodingException;
import java.net.InetAddress;
import java.net.UnknownHostException;

import pt.linkare.ant.InvalidPropertySpecException;

public class HostnamePropertyReader extends AbstractPropertyReader{

	public HostnamePropertyReader() {
		super();
	}

	public String readProperty() throws InvalidPropertySpecException, UnsupportedEncodingException {
		String hostname=null;
		while(hostname==null)
		{
			hostname=readPropertySimple();
			if(!parseBoolean(getProperty().getMetaData("validate"),false))
				return hostname;

			if(parseBoolean(getProperty().getMetaData("validate"),false) && !isValidHostname(hostname))
			{
				System.out.println("Host  "+hostname+" is not a valid address!");
				hostname=null;			
			}
		}
		return hostname;
	}
	
	protected String readPropertySimple() throws UnsupportedEncodingException
	{
		String message=buildDefaultMessage();
		
		if(getProperty().getPropertyDefaultValue()!=null)
			return getInput().readStringOrDefault(message, getProperty().getPropertyDefaultValue());
		else
		{
			return getInput().readString(message, getProperty().isPropertyRequired()?1:0);
		}
			
	}
	
	
	protected boolean isValidHostname(String hostname)
	{
		InetAddress[] addresses=null;
		try {
			addresses = InetAddress.getAllByName(hostname);
		}
		catch (UnknownHostException e) {
			return false;			
		}
		
		if(addresses!=null && addresses.length>0)
			return true;
		else
			return false;
	}
	
}