net.sf.freehost3270.client

Class RWTn3270StreamParser

java.lang.Object

net.sf.freehost3270.client.RWTn3270StreamParser

public class RWTn3270StreamParser
extends Object

This class is the mack-daddy of the 3270 Engine, it takes the data from the RWTelnet class (through the incomingData method of the RWTnAction interface.) and makes sense of it.

It also implements all of the commands and orders outlined in the "3270 Data Stream Programmer's Reference" (GA23-0059-07) in chapters 3 & 4.

Since:

0.1

Field Summary

Fields

Modifier and Type	Field and Description
protected RWTnAction	client

Constructor Summary

Constructors

Constructor and Description
RWTn3270StreamParser(RW3270 rw, RWTnAction client)

Method Summary

Methods

Modifier and Type	Method and Description
protected void	parse(short[] inBuf, int inBufLen) This method takes an input buffer and executes the appropriate tn3270 commands and orders.
protected void	readModified() 3.6.2.1 Read Modified Operation

Methods inherited from class java.lang.Object

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

Field Detail

client

protected RWTnAction client

Constructor Detail

RWTn3270StreamParser

public RWTn3270StreamParser(RW3270 rw,
                    RWTnAction client)

Method Detail

parse

protected void parse(short[] inBuf,
         int inBufLen)
              throws IOException

This method takes an input buffer and executes the appropriate tn3270 commands and orders.

Throws:

IOException

readModified

protected void readModified()

3.6.2.1 Read Modified Operation

During a read modified operation, if an AID other than selector pen attention, cursor select key, PAkey, or Clear key is generated, all fields that have been modified by keyboard, selector pen, or magnetic reader activity are transferred to the application program. A major feature of the read modified operation is null suppression. Only non-null character data and corresponding character attribute data (in Character mode)are transmitted. All null character data and all extended attributes for null character data are suppressed.

If a space or null selector pen AID is generated, fields are not transferred to main storage during the read modified operation. Instead, when a set MDTbit is found (indicating selector pen and/or keyboard activity), only the read heading, the SBA order code, and the attribute address +1 are transferred.

If the buffer is unformatted (contains no fields), the read data stream consists of the 3-byte read heading followed by all alphanumeric data in the buffer (nulls are suppressed), even when part or all of the data has not been modified. Since an unformatted buffer contains no attribute bytes no SBA codes with associated addresses or address characters included in the data stream, and the modification of data cannot be determined. Data transfer starts at address 0 and continues to the end of the buffer. At the end of the operation, the buffer address is set to 0.