Andrej Cimperšek - diploma

package org.lidar;

import java.io.InputStream;

import java.io.OutputStream;

import javax.comm.*;

import java.util.*;

import org.apache.commons.configuration.XMLConfiguration;

import org.lidar.api.Management;

/**

 * Serial port communication

 * @author Andrej Cimpersek

 */

public class Serial {

    private boolean isOpened = false;

    private String deviceName;

    private String portName;

    private Enumeration portIdentifiers;

    private CommPortIdentifier portId;

    private SerialPort port;

    protected InputStream inputStream;

    protected OutputStream outputStream;

    private int baudRate, dataBits, stopBits, parity;

    private XMLConfiguration configuration;

    public Serial(String deviceName){

        configuration = Config.getConfiguration();

        this.portName = configuration.getString(String.format("devices.%s.port", deviceName));

        this.baudRate = configuration.getInt(String.format("devices.%s.baudRate", deviceName));

        this.dataBits = configuration.getInt(String.format("devices.%s.dataBits", deviceName));

        this.stopBits = configuration.getInt(String.format("devices.%s.stopBits", deviceName));

        this.parity = configuration.getInt(String.format("devices.%s.parity", deviceName));

    }

    /**

     * Check each port identifier if

     *   (a) it indicates a serial (not a parallel) port, and

     *   (b) matches the desired name.

     * @return boolean

     */

    protected boolean identfy(){

        this.portIdentifiers = CommPortIdentifier.getPortIdentifiers();

        this.portId = null;  // will be set if port found

        while (portIdentifiers.hasMoreElements())

        {

            CommPortIdentifier pid = (CommPortIdentifier)portIdentifiers.nextElement();

            if(pid.getPortType() == CommPortIdentifier.PORT_SERIAL && pid.getName().equals(this.portName)){

                this.portId = pid;

                return true;

            }

        }

        return false;

    }

    /**

     * Destructor - close port

     */

    @Override()

    protected void finalize() throws Throwable{

        closePort();

    }

    public boolean acquirePort(){

        if(this.portId == null) return false;

        // Use port identifier for acquiring the port

        try {

            this.port = (SerialPort)this.portId.open(

                this.deviceName, // Name of the application asking for the port

                10000   // Wait max. 10 sec. to acquire port

            );

        } catch(PortInUseException e) {

            return false;

        }

        return true;

    }

    public boolean openPort(){

        if(!acquirePort()) return false;

        closePort();

        try {

            this.port.setSerialPortParams(this.baudRate, this.dataBits, this.stopBits, this.parity);

            this.port.removeEventListener();

            this.port.addEventListener(new SerialPortEventListener() {

                public void serialEvent(SerialPortEvent event){

                    switch(event.getEventType()) {

                        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:

                            onOutputBufferEmpty(event);

                            break;

                        case SerialPortEvent.DATA_AVAILABLE:

                            onDataAvailable(event);

                            break;

                    }

                }

            });

            this.inputStream = this.port.getInputStream();

            this.outputStream = this.port.getOutputStream();

            this.isOpened = true;

        } catch (Exception e) {

            this.isOpened = false;

        } finally {

            return this.isOpened;

        }

    }

    public void closePort(){

        if(this.port == null) return;

        try {

            this.inputStream.close();

            this.outputStream.close();

            this.port.close();

        } catch (Exception e) {

        } finally {

            this.isOpened = false;

        }

    }

    /**

     * Write shortcut for string

     */

    public boolean sendCommand(String lockToken, String string){

        return sendCommand(lockToken, string.getBytes());

    }

    /**

     * Write shortcut

     * @param bytes

     * @return boolean

     */

    public boolean sendCommand(String lockToken, byte[] bytes){

        // TODO: worker, ki odklene po X času brez dostopa

        if(!Management.locked || lockToken != Management.lockToken) return false;

        Management.lockAccess = new Date();

        try {

            outputStream.write(bytes);

        } catch (Exception e) {

            return false;

        }

        return true;

    }

    /**

     * Handle output buffer empty events.

     * NOTE: The reception of this event is optional and not

     *       guaranteed by the API specification.

     * @param event The output buffer empty event

     */

    protected void onOutputBufferEmpty(SerialPortEvent event){

        //TODO: implement

    }

    /**

     * Handle data available events.

     * @param event The data available event

     */

    protected void onDataAvailable(SerialPortEvent event){

        //TODO: implement

    }

}