package argon;

import javax.xml.messaging.JAXMServlet;
import javax.xml.messaging.OnewayListener;
import javax.xml.soap.*;
import java.util.*;

/**
 * Asynchronous JAXM Service for processing a invoice and updating the invoice processing system.
 */
public class InvoicingServlet
	extends JAXMServlet
	implements OnewayListener
{

	/**
	 * Extracts the invoice from the SOAP message and updates the invoice processing system.
     */
	public void onMessage(SOAPMessage message)
	{
		try
		{
			
			SOAPPart part = message.getSOAPPart();		
			SOAPEnvelope envelope = part.getEnvelope();
			SOAPBody body = envelope.getBody();
			
			// Extract information about the invoice from the SOAPMessage.
			Iterator itr = body.getChildElements(envelope.createName("invoice"));
			if (itr.hasNext())
			{
				SOAPElement element = (SOAPElement)itr.next();
				Invoice invoice = new Invoice();
				
				// Extract Client Name.
				String client = extractData(element.getChildElements(envelope.createName("client")));
				invoice.setClient(client);
				
				// Extract Company Name.
				String company = extractData(element.getChildElements(envelope.createName("company")));
				invoice.setCompany(company);
				
				// Extract Hours.
				String hours = extractData(element.getChildElements(envelope.createName("hours")));
				invoice.setHours(Double.parseDouble(hours));				
				
				// Process the invoice.
				InvoiceProcessingSystem.getInstance().process(invoice);					
			}	
			
		}
		catch (SOAPException se)
		{
			se.printStackTrace();
		}
	}
	
	// Extracts the text value of a XML element.
	private String extractData(Iterator itr)
	{
		if (itr.hasNext())
		{
			SOAPElement element = (SOAPElement)itr.next();
			return element.getValue();
		}
		else
		{
			return "";
		}
	}

}