/**
* Copyright (c) 2010-2014, openHAB.org and others.
*
* 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.epsonprojector.connector;
import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;
import org.apache.commons.io.IOUtils;
import org.openhab.binding.epsonprojector.internal.EpsonProjectorException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Connector for serial port communication.
*
* @author Pauli Anttila
* @since 1.3.0
*/
public class EpsonProjectorSerialConnector implements EpsonProjectorConnector {
private static final Logger logger =
LoggerFactory.getLogger(EpsonProjectorSerialConnector.class);
String serialPortName = null;
InputStream in = null;
OutputStream out = null;
SerialPort serialPort = null;
public EpsonProjectorSerialConnector(String serialPort) {
serialPortName = serialPort;
}
/**
* {@inheritDoc}
*/
public void connect() throws EpsonProjectorException {
try {
logger.debug("Open connection to serial port '{}'", serialPortName);
CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(serialPortName);
CommPort commPort = portIdentifier.open(this.getClass().getName(),2000);
serialPort = (SerialPort) commPort;
serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
serialPort.enableReceiveThreshold(1);
serialPort.disableReceiveTimeout();
in = serialPort.getInputStream();
out = serialPort.getOutputStream();
out.flush();
if (in.markSupported()) {
in.reset();
}
} catch (Exception e) {
throw new EpsonProjectorException(e);
}
}
/**
* {@inheritDoc}
*/
public void disconnect() throws EpsonProjectorException {
if (out != null) {
logger.debug("Close serial out stream");
IOUtils.closeQuietly(out);
}
if (in != null) {
logger.debug("Close serial in stream");
IOUtils.closeQuietly(in);
}
if (serialPort != null) {
logger.debug("Close serial port");
serialPort.close();
}
serialPort = null;
out = null;
in = null;
logger.debug("Closed");
}
/**
* {@inheritDoc}
*/
public String sendMessage(String data, int timeout) throws EpsonProjectorException {
try {
// flush input stream
if (in.markSupported()) {
in.reset();
} else {
while (in.available() > 0) {
int availableBytes = in.available();
if (availableBytes > 0) {
byte[] tmpData = new byte[availableBytes];
in.read(tmpData, 0, availableBytes);
}
}
}
out.write(data.getBytes());
out.write("\r\n".getBytes());
out.flush();
String resp = "";
long startTime = System.currentTimeMillis();
long elapsedTime = 0;
while (elapsedTime < timeout) {
int availableBytes = in.available();
if (availableBytes > 0) {
byte[] tmpData = new byte[availableBytes];
int readBytes = in.read(tmpData, 0, availableBytes);
resp = resp.concat(new String(tmpData, 0, readBytes));
if (resp.contains(":")) {
return resp;
}
} else {
Thread.sleep(100);
}
elapsedTime = Math.abs((new Date()).getTime() - startTime);
}
} catch (Exception e) {
throw new EpsonProjectorException(e);
}
return null;
}
}