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/**
 * COOS - Connected Objects Operating System (www.connectedobjects.org).
 *
 * Copyright (C) 2009 Telenor ASA and Tellu AS. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 *
 * You may also contact one of the following for additional information:
 * Telenor ASA, Snaroyveien 30, N-1331 Fornebu, Norway (www.telenor.no)
 * Tellu AS, Hagalokkveien 13, N-1383 Asker, Norway (www.tellu.no)
 */
package org.coos.messaging;

/**
 * @author Knut Eilif Husa, Tellu AS 
 * A helperclass for communicating with the bus
 */
public class InteractionHelper {

	Endpoint endpoint;

	public InteractionHelper(Endpoint endpoint) {
		this.endpoint = endpoint;
	}

	/**
	 * Request an exchange from the supplied endpointUri
	 * 
	 * @param endpointUri
	 *            the endpoint uri
	 * @param exchange
	 *            the exchange to be processed
	 * @return the processed exchange
	 */
	public Exchange request(String endpointUri, Exchange exchange) {
		exchange.setPattern(new ExchangePattern(ExchangePattern.OutIn));
		Message msg = exchange.getOutBoundMessage();
		msg.setReceiverEndpointUri(endpointUri);
		return endpoint.processExchange(exchange);
	}

	/**
	 * Sends a reply to the exchange
	 * 
	 * @param exchange
	 *            the exchange to be processed
	 * @return the processed exchange
	 */
	public Exchange reply(Exchange exchange) {
		Message inMsg = exchange.getInBoundMessage();
		Message outMsg = exchange.getOutBoundMessage();
		outMsg.setReceiverEndpointUri(inMsg.getSenderEndpointUri());
		outMsg.setSenderEndpointUri(inMsg.getReceiverEndpointUri());
		return endpoint.processExchange(exchange);
	}

	/**
	 * Sends a exchange to the endpoint using the supplied endpoint uri
	 * 
	 * @param endpointUri
	 *            the endpoint uri
	 * @param exchange
	 *            the exchange to be processed
	 * @return the processed exchange
	 */
	public Exchange send(String endpointUri, Exchange exchange) {
		Message msg = exchange.getOutBoundMessage();
		msg.setReceiverEndpointUri(endpointUri);
		return endpoint.processExchange(exchange);
	}
	
	/**
	 * Sends a exchange to the endpoint using the supplied endpoint uri
	 * 
	 * @param endpointUri
	 *            the endpoint uri
	 * @param exchange
	 *            the exchange to be processed
	 * @return the processed exchange
	 */
	public Exchange sendRobust(String endpointUri, Exchange exchange) {
		exchange.setPattern(new ExchangePattern(ExchangePattern.RobustOutOnly));
		Message msg = exchange.getOutBoundMessage();
		msg.setReceiverEndpointUri(endpointUri);
		return endpoint.processExchange(exchange);
	}

	/**
	 * Sends a exchange to the endpoint using the supplied endpoint uri and
	 * asyncCallback
	 * 
	 * @param endpointUri
	 *            the endpoint uri
	 * @param exchange
	 *            the exchange to be processed
	 * @param callback
	 *            the callback notifying when the exchange is ready
	 */
	public void send(String endpointUri, Exchange exchange, AsyncCallback callback) {
		Message msg = exchange.getOutBoundMessage();
		msg.setReceiverEndpointUri(endpointUri);
		endpoint.processExchange(exchange, callback);
	}
}