icube.ezhdlc

Class HDLCProtocol

java.lang.Object

icube.ezhdlc.HDLCProtocol

public final class HDLCProtocol
extends java.lang.Object

Implementation of the HDLC protocol.

Constructor Summary

Constructors

Constructor and Description
HDLCProtocol(HDLCParameters hdlcParameters, java.io.InputStream inStream, java.io.OutputStream outStream) Instantiates a new HDLCProtocol

Method Summary

Modifier and Type	Method and Description
void	connect() Connects the HDLC channel to the server.
void	disconnect() Disconnects the HDLC channel from the server.
byte[]	getPushedAPDU()
HDLCProtocolState	getState() Returns the HDLC state.
void	poll()
byte[]	sendReceive(byte[] outData) Sends bytes to the server and then receives bytes from the server.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

HDLCProtocol

public HDLCProtocol(HDLCParameters hdlcParameters,
                    java.io.InputStream inStream,
                    java.io.OutputStream outStream)

Instantiates a new HDLCProtocol

Parameters:

hdlcParameters - The HDLC parameters to use.

inStream - The InputStream to get bytes from the device server.

outStream - The OutputStream to send bytes to the device server.

Two mechanisms are used to detect a timeout in receiving bytes from the device server.

• return of -1 from inStream.read() (which means end of stream);
• SocketTimeoutException raised by the stream.

Method Detail

getState

public HDLCProtocolState getState()

Returns the HDLC state.

Returns:

HDLC state.

connect

public void connect()
             throws EzHdlcException,
                    java.io.IOException

Connects the HDLC channel to the server.

Throws:

EzHdlcException - Thrown for any detected error.

java.io.IOException

disconnect

public void disconnect()
                throws EzHdlcException,
                       java.io.IOException

Disconnects the HDLC channel from the server.

Throws:

EzHdlcException - Thrown for any detected error.

java.io.IOException

poll

public void poll()
          throws EzHdlcException,
                 java.io.IOException

Throws:

EzHdlcException

java.io.IOException

sendReceive

public byte[] sendReceive(byte[] outData)
                   throws EzHdlcException,
                          java.io.IOException

Sends bytes to the server and then receives bytes from the server.

Parameters:

outData - Byte array to be send to the server.

Returns:

Byte array of received bytes.

Throws:

EzHdlcException - the ezhdlc exception

java.io.IOException

getPushedAPDU

public byte[] getPushedAPDU()
                     throws EzHdlcException,
                            java.io.IOException

Throws:

EzHdlcException

java.io.IOException