Lib485Connection.java

/**
 * Copyright (c) 2010-2016 by the respective copyright holders.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.openhab.binding.dmx.lib485;

import java.io.IOException;
import java.net.Socket;

import org.apache.commons.lang.StringUtils;
import org.openhab.binding.dmx.DmxConnection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * DMX Connection Implementation using lib485 as the DMX target.
 */
public class Lib485Connection implements DmxConnection {

    private static final Logger logger = LoggerFactory.getLogger(Lib485Connection.class);

    private Socket connection;

    private final static String DEFAULT_HOST = "localhost";

    private final static int DEFAULT_PORT = 9020;

    @Override
    public void open(String connectionString) throws Exception {
        String host = DEFAULT_HOST;
        int port = DEFAULT_PORT;

        if (StringUtils.isNotBlank(connectionString)) {
            String[] connectionStringElements = connectionString.split(":");
            if (connectionStringElements.length == 1) {
                host = connectionStringElements[0];
            } else if (connectionStringElements.length == 2) {
                host = connectionStringElements[0];
                port = Integer.valueOf(connectionStringElements[1]).intValue();
            }
        }

        connection = new Socket(host, port);
        if (connection.isConnected()) {
            logger.debug("Connected to Lib485 DMX service");
        }
    }

    @Override
    public void close() {
        if (connection != null && !connection.isClosed()) {
            try {
                connection.close();
            } catch (IOException e) {
                logger.warn("Could not close socket.", e);
            }
        }
        connection = null;
    }

    @Override
    public boolean isClosed() {
        return connection.isClosed();
    }

    @Override
    public void sendDmx(byte[] buffer) throws Exception {
        logger.debug("Sending Data to DMX");
        connection.getOutputStream().write(buffer);
    }

}