Restrictions of KaffePC

• 1. java.net package
  • 1.1 Abstract
  • 1.2 the creation of the instance
  • 1.3 each class
• 2. javax.comm package
  • 2.1 Abstract
  • 2.2 each class
• 3. Others

1. java.net package

1.1 Abstract

• Only support TCP/IP type streamsocket
• Can not search host name from IP address.
• Number of sockets that can create is limited to 23
• The setting of the socket-option support only about the value of time out.
• Can not communcate to localhost.

1.2 creation of an instance

• DatagramPacket
• InetAddress
• ServerSocket
• Socket
• URLEncoder

• DatagramSocket
• MulticastSocket

1.3 Each class

InetAddress class

public String getHostName()

return "<unknown>" in the case of that specify IP address as hostname.

Socket class

public int getSoLinger()

public boolean getTcpNoDelay()

public void setSoLinger(boolean on, int timeout)

public void setTcpNoDelay(boolean on)

issue SocketException.

ServerSocket class

public ServerSocket(int port, int backlog)

public ServerSocket(int port, int backlog, InetAddress bindAddr)

backlog is always set to 1.

HttpURLConnection class

only support GET about request for HTTP protocol.

don't support a proxy.

URL class

support only http protocol and file protocol.

2. javax.comm package

2.1 Abstract

• support only serial port.
• only serial port name "COM1", "COM2" and "COM3" available.
• don't support following receive parameter.
  • receive framing
  • receive threshold
  • receive timeout
• can't specify the size of input and output buffer.
• can't handle send/receive of break character.
• can't set the flow control
• can't control the MODEM mechanism
• only support the receive event about the receive handling of asynchronous event.

2.2 Each class

javax.comm.CommPort class

public void enableReceiveThreshold(int thresh)

public void enableReceiveFraming(int framingByte)

public void enableReceiveTimeout(int rcvTimeout)

issue UnsupportedCommOperationException.

public void setInputBufferSize(int size)

public void setOutputBufferSize(int size)

ignore the specification about the size of input and output buffer.

javax.comm.SerialPort class

public void setFlowControlMode(int flowcontrol)

issue UnsupportedCommOperationException.

javax.comm.CommPortIdentifier class

public synchronized CommPort open(String appname, int timeout)

the value of timeout argument is ignored.

public void addPortOwnershipListener(CommPortOwnershipListener listener)

public void removePortOwnershipListener(CommPortOwnershipListener listener)

issue kaffe.util.NotImplemented.

javax.comm.SerialPort class

public abstract void sendBreak(int millis)

public void setRcvFifoTrigger(int trigger)

public void setDTR(boolean dtr)

public boolean isDTR()

public void setRTS(boolean rts)

public boolean isRTS()

public boolean isCTS()

public boolean isDSR()

public boolean isRI()

public boolean isCD()

public void notifyOnOutputEmpty(boolean enable)

public void notifyOnCTS(boolean enable)

public void notifyOnDSR(boolean enable)

public void notifyOnRingIndicator(boolean enable)

public void notifyOnCarrierDetect(boolean enable)

public void notifyOnOverrunError(boolean enable)

public void notifyOnParityError(boolean enable)

public void notifyOnFramingError(boolean enable)

public void notifyOnBreakInterrupt(boolean enable)

issue kaffe.util.NotImplemented.

3. Others

java.lang.Process class

can't invoke child process.

java.lang.System class

Since System.out, System.err is opened in textmode, then it have following problems.

• translate "\n" to "\r\n" but through "\r\n".
• close the stream and due to output Ctrl-Z.

java.lang.Class class

allow to create the instance for the class that have private constructer due to call newInstance().

java.lang.Double, java.lang.Float class

toString() return fixed length string.

java.net.ServerSocket class

can create multiple ServerSocket for same port.

don't issue BindException.

java.io.ObjectInputStream class

issue kaffe.util.Notimpleted due to call following methods.

• public int available() throws IOException
• public String readLine() throws IOException
• public synchronized void registerValidation(ObjectInputValidation obj, int prio) throws NotActiveException, InvalidObjectException
• public int skipBytes(int count) throws IOException

java.io.ObjectStreamClass class

don't have following method.

• public long getSerialVersionUID()

java.util.GregorianCalenar class

issue kaffe.util.Notimpleted due to call following methods.

• public void add(int field, int amount)
• public void roll(int field, boolean up)

java.text.BreakIterator class

can't ensure correctly behaviour.

java.text.ChoiceFormat class

can't ensure correctly behaviour about following method.

• public void applyPattern(String patt)

java.text.Collator class

can't create instance since the locale information not exist.

java.text.MessageFormat class

Following methods issue kaffe.util.Notimpleted.

• public Object[] parse(String str, ParsePosition pos)
• public String toPattern()