package at.gv.egovernment.moa.id.proxy;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.util.Vector;

import javax.net.ssl.SSLSocketFactory;
import javax.servlet.http.HttpServletRequest;

/**
 * Builder for {@link java.net.URLConnection} objects used to forward requests
 * to the remote online application.
 * 
 * @author Paul Ivancsics
 * @version $Id$
 */

public interface ConnectionBuilder {
	
	/**
	 * Builds an HttpURLConnection to a {@link java.net.URL} which is derived
	 * from an {@link HttpServletRequest} URL, by substitution of a 
     * public URL prefix for the real URL prefix.<br>
     * The HttpURLConnection has been created by {@link java.net.URL#openConnection}, but
     * it has not yet been connected to by {@link java.net.URLConnection#connect}.<br>
     * The field settings of the HttpURLConnection are:
     * <ul>
     * <li><code>allowUserInteraction = false</code></li>
     * <li><code>doInput = true</code></li>
     * <li><code>doOutput = true</code></li>
     * <li><code>requestMethod = request.getMethod()</code></li>
     * <li><code>useCaches = false</code></li>
     * </ul>
	 * 
	 * @param request the incoming request which shall be forwarded
	 * @param publicURLPrefix the public URL prefix to be substituted by the real URL prefix
	 * @param realURLPrefix the URL prefix to substitute the public URL prefix
	 * @param sslSocketFactory factory to be used for creating an SSL socket in case
	 *         of a URL for scheme <code>"https:"</code>;
	 * 				 <br>if <code>null</code>, the default SSL socket factory would be used 
	 * @param parameters parameters to be forwarded
	 * @return a URLConnection created by {@link java.net.URL#openConnection}, connecting to 
	 * 					the requested URL with <code>publicURLPrefix</code> substituted by <code>realURLPrefix</code>
	 * @throws IOException if an I/O exception occurs during opening the connection
	 * @see java.net.URL#openConnection()
	 * @see com.sun.net.ssl.HttpsURLConnection#getDefaultSSLSocketFactory()
	 */
	public HttpURLConnection buildConnection(
		HttpServletRequest request,
		String publicURLPrefix,
		String realURLPrefix,
		SSLSocketFactory sslSocketFactory,
		Vector parameters) throws IOException;

 	
    /**
     * Disconnects the HttpURLConnection if necessary.
     * The implementation of the Connectionbuilder decides wether 
     * if this should be happen or not.
     *
     * @param con the HttpURLConnection which is normaly to be closed
     */
	public void disconnect(HttpURLConnection con);
}