Package org.apache.commons.net.telnet
Class TelnetOptionHandler
- java.lang.Object
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- org.apache.commons.net.telnet.TelnetOptionHandler
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- Direct Known Subclasses:
EchoOptionHandler
,SimpleOptionHandler
,SuppressGAOptionHandler
,TerminalTypeOptionHandler
,WindowSizeOptionHandler
public abstract class TelnetOptionHandler extends java.lang.Object
The TelnetOptionHandler class is the base class to be used for implementing handlers for telnet options.TelnetOptionHandler implements basic option handling functionality and defines abstract methods that must be implemented to define subnegotiation behavior.
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Field Summary
Fields Modifier and Type Field Description private boolean
acceptLocal
true if the option should be accepted on the local sideprivate boolean
acceptRemote
true if the option should be accepted on the remote sideprivate boolean
doFlag
true if the option is active on the local sideprivate boolean
initialLocal
true if the option should be activated on the local sideprivate boolean
initialRemote
true if the option should be activated on the remote sideprivate int
optionCode
Option codeprivate boolean
willFlag
true if the option is active on the remote side
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Constructor Summary
Constructors Constructor Description TelnetOptionHandler(int optcode, boolean initlocal, boolean initremote, boolean acceptlocal, boolean acceptremote)
Constructor for the TelnetOptionHandler.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int[]
answerSubnegotiation(int[] suboptionData, int suboptionLength)
Method called upon reception of a subnegotiation for this option coming from the other end.boolean
getAcceptLocal()
Returns a boolean indicating whether to accept a DO request coming from the other end.boolean
getAcceptRemote()
Returns a boolean indicating whether to accept a WILL request coming from the other end.(package private) boolean
getDo()
Returns a boolean indicating whether a DO request sent to the other side has been acknowledged.boolean
getInitLocal()
Returns a boolean indicating whether to send a WILL request to the other end upon connection.boolean
getInitRemote()
Returns a boolean indicating whether to send a DO request to the other end upon connection.int
getOptionCode()
Returns the option code for this option.(package private) boolean
getWill()
Returns a boolean indicating whether a WILL request sent to the other side has been acknowledged.void
setAcceptLocal(boolean accept)
Set behavior of the option for DO requests coming from the other end.void
setAcceptRemote(boolean accept)
Set behavior of the option for WILL requests coming from the other end.(package private) void
setDo(boolean state)
Tells this option whether a DO request sent to the other side has been acknowledged (invoked by TelnetClient).void
setInitLocal(boolean init)
Tells this option whether to send a WILL request upon connection.void
setInitRemote(boolean init)
Tells this option whether to send a DO request upon connection.(package private) void
setWill(boolean state)
Tells this option whether a WILL request sent to the other side has been acknowledged (invoked by TelnetClient).int[]
startSubnegotiationLocal()
This method is invoked whenever this option is acknowledged active on the local end (TelnetClient sent a WILL, remote side sent a DO).int[]
startSubnegotiationRemote()
This method is invoked whenever this option is acknowledged active on the remote end (TelnetClient sent a DO, remote side sent a WILL).
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Field Detail
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optionCode
private int optionCode
Option code
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initialLocal
private boolean initialLocal
true if the option should be activated on the local side
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initialRemote
private boolean initialRemote
true if the option should be activated on the remote side
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acceptLocal
private boolean acceptLocal
true if the option should be accepted on the local side
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acceptRemote
private boolean acceptRemote
true if the option should be accepted on the remote side
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doFlag
private boolean doFlag
true if the option is active on the local side
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willFlag
private boolean willFlag
true if the option is active on the remote side
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Constructor Detail
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TelnetOptionHandler
public TelnetOptionHandler(int optcode, boolean initlocal, boolean initremote, boolean acceptlocal, boolean acceptremote)
Constructor for the TelnetOptionHandler. Allows defining desired initial setting for local/remote activation of this option and behavior in case a local/remote activation request for this option is received.- Parameters:
optcode
- - Option code.initlocal
- - if set to true, a WILL is sent upon connection.initremote
- - if set to true, a DO is sent upon connection.acceptlocal
- - if set to true, any DO request is accepted.acceptremote
- - if set to true, any WILL request is accepted.
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Method Detail
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answerSubnegotiation
public int[] answerSubnegotiation(int[] suboptionData, int suboptionLength)
Method called upon reception of a subnegotiation for this option coming from the other end.This implementation returns null, and must be overridden by the actual TelnetOptionHandler to specify which response must be sent for the subnegotiation request.
- Parameters:
suboptionData
- - the sequence received, without IAC SB & IAC SEsuboptionLength
- - the length of data in suboption_data- Returns:
- response to be sent to the subnegotiation sequence. TelnetClient will add IAC SB & IAC SE. null means no response
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getAcceptLocal
public boolean getAcceptLocal()
Returns a boolean indicating whether to accept a DO request coming from the other end.- Returns:
- true if a DO request shall be accepted.
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getAcceptRemote
public boolean getAcceptRemote()
Returns a boolean indicating whether to accept a WILL request coming from the other end.- Returns:
- true if a WILL request shall be accepted.
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getDo
boolean getDo()
Returns a boolean indicating whether a DO request sent to the other side has been acknowledged.- Returns:
- true if a DO sent to the other side has been acknowledged.
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getInitLocal
public boolean getInitLocal()
Returns a boolean indicating whether to send a WILL request to the other end upon connection.- Returns:
- true if a WILL request shall be sent upon connection.
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getInitRemote
public boolean getInitRemote()
Returns a boolean indicating whether to send a DO request to the other end upon connection.- Returns:
- true if a DO request shall be sent upon connection.
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getOptionCode
public int getOptionCode()
Returns the option code for this option.- Returns:
- Option code.
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getWill
boolean getWill()
Returns a boolean indicating whether a WILL request sent to the other side has been acknowledged.- Returns:
- true if a WILL sent to the other side has been acknowledged.
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setAcceptLocal
public void setAcceptLocal(boolean accept)
Set behavior of the option for DO requests coming from the other end.- Parameters:
accept
- - if true, subsequent DO requests will be accepted.
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setAcceptRemote
public void setAcceptRemote(boolean accept)
Set behavior of the option for WILL requests coming from the other end.- Parameters:
accept
- - if true, subsequent WILL requests will be accepted.
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setDo
void setDo(boolean state)
Tells this option whether a DO request sent to the other side has been acknowledged (invoked by TelnetClient).- Parameters:
state
- - if true, a DO request has been acknowledged.
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setInitLocal
public void setInitLocal(boolean init)
Tells this option whether to send a WILL request upon connection.- Parameters:
init
- - if true, a WILL request will be sent upon subsequent connections.
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setInitRemote
public void setInitRemote(boolean init)
Tells this option whether to send a DO request upon connection.- Parameters:
init
- - if true, a DO request will be sent upon subsequent connections.
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setWill
void setWill(boolean state)
Tells this option whether a WILL request sent to the other side has been acknowledged (invoked by TelnetClient).- Parameters:
state
- - if true, a WILL request has been acknowledged.
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startSubnegotiationLocal
public int[] startSubnegotiationLocal()
This method is invoked whenever this option is acknowledged active on the local end (TelnetClient sent a WILL, remote side sent a DO). The method is used to specify a subnegotiation sequence that will be sent by TelnetClient when the option is activated.This implementation returns null, and must be overriden by the actual TelnetOptionHandler to specify which response must be sent for the subnegotiation request.
- Returns:
- subnegotiation sequence to be sent by TelnetClient. TelnetClient will add IAC SB & IAC SE. null means no subnegotiation.
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startSubnegotiationRemote
public int[] startSubnegotiationRemote()
This method is invoked whenever this option is acknowledged active on the remote end (TelnetClient sent a DO, remote side sent a WILL). The method is used to specify a subnegotiation sequence that will be sent by TelnetClient when the option is activated.This implementation returns null, and must be overriden by the actual TelnetOptionHandler to specify which response must be sent for the subnegotiation request.
- Returns:
- subnegotiation sequence to be sent by TelnetClient. TelnetClient will add IAC SB & IAC SE. null means no subnegotiation.
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