ConnectionFactory.java

package edu.colostate.vchill.connection;


import edu.colostate.vchill.ControlMessage;
import edu.colostate.vchill.cache.CacheMainLRU;
import edu.colostate.vchill.socket.SocketConnection;


/**
 * Factory for creating different Connection objects based on the url
 * <p/>
 * the connection represents
 *
 * @author Jochen Deyke
 * @author jpont
 * @version 2009-04-07
 */

public final class ConnectionFactory

{

    /**
     * Private default constructor prevents instantiation
     */

    private ConnectionFactory() {
    }


    /**
     * Creates different Connection objects based on the url the connection represents
     *
     * @param key   ControlMessage containing the url to connect to (other fields are ignored)
     * @param cache cache shared by entire backend
     * @return the new connection
     * @throws IllegalArgumentException if the url contained in the key is not valid
     */

    public static Connection createConnection(final ControlMessage key, final CacheMainLRU cache, final boolean promptLogin)

    {

        String url = key.getURL();

        int splitpoint = url.lastIndexOf(":");

        if (splitpoint < 0) throw new IllegalArgumentException("ConnectionFactory: \"" + url + "\" is not a valid URL");

        String name = url.substring(0, splitpoint);

        String portString = url.substring(splitpoint + 1);

        int port = Integer.parseInt(portString);

        //if (port < 0) return new FileConnection(name, cache);

        if (port < 0) return null;

        else return new SocketConnection(name, port, cache, promptLogin);

    }

}