ftp2me
Class Ftp2Me
java.lang.Object
ftp2me.Ftp2Me
public class Ftp2Me
- extends java.lang.Object
Ftp client class for j2me
Implements all of the RFC959 commands
Constructor Summary |
Ftp2Me(java.lang.String host)
Create an instance of Ftp2Me. |
Ftp2Me(java.lang.String host,
int port)
Create an instance of Ftp2Me. |
Ftp2Me(java.lang.String host,
int port,
java.lang.String user,
java.lang.String pass)
Create an instance of Ftp2Me. |
Ftp2Me(java.lang.String host,
int port,
java.lang.String user,
java.lang.String pass,
java.lang.String acct)
Create an instance of Ftp2Me. |
Method Summary |
boolean |
abor()
Abort
This command tells the server to abort the previous FTP
service command and any associated transfer of data. |
void |
acct(java.lang.String account)
Account
The argument field is a Telnet string identifying the user’s
account. |
boolean |
allo(long size,
long maxRecordSize)
Allocate
This command may be required by some servers to reserve
sufficient storage to accommodate the new file to be
transferred. |
void |
appe(java.io.InputStream is,
java.lang.String filename)
Append (with create)
This command causes the server-DTP to accept the data
transferred via the data connection and to store the data in
a file at the server site. |
void |
cdup()
Change to parent directory
This command is a special case of CWD, and is included to
simplify the implementation of programs for transferring
directory trees between operating systems having different
syntaxes for naming the parent directory. |
void |
cwd(java.lang.String dir)
Changes the working directory
This command allows the user to work with a different
directory or dataset for file storage or retrieval without
altering his login or accounting information. |
void |
dele(java.lang.String filename)
Delete
This command causes the file specified in the pathname to be
deleted at the server site. |
void |
disconnect()
Disconnects from the FTP server. |
void |
expectResponse(int expectedCode)
Gets a response. |
java.lang.String |
getLastMessage()
Returns the last message from the server. |
void |
help(java.lang.String command)
Help
This command shall cause the server to send helpful
information regarding its implementation status over the
control connection to the user. |
boolean |
isNegativePermanent()
Is the last message a negative permanent reply? |
boolean |
isNegativeTransient()
Is the last message a negative transient reply? |
boolean |
isPositiveCompletion()
Is the last message a positive completion reply? |
boolean |
isPositiveIntermediate()
Is the last message a positive intermediate reply? |
boolean |
isPositivePreliminary()
Is the last message a positive preliminary reply? |
java.util.Enumeration |
list()
List
This command causes a list to be sent from the server to the
passive DTP. |
void |
mkd(java.lang.String pathname)
Make directory
This command causes the directory specified in the pathname
to be created as a directory (if the pathname is absolute)
or as a subdirectory of the current working directory (if
the pathname is relative). |
void |
mode(char mode)
Transfer mode
The argument is a single Telnet character code specifying
the data transfer modes described in the Section on
Transmission Modes. |
java.util.Enumeration |
nlst()
Name list
This command causes a directory listing to be sent from
server to user site. |
void |
noop()
No operation
This command does not affect any parameters or previously
entered commands. |
void |
pass(java.lang.String pass)
Password
The argument field is a Telnet string specifying the user’s
password. |
PasvInfo |
pasv()
Passive
This command requests the server-DTP to "listen" on a data
port (which is not its default data port) and to wait for h1
connection rather than initiate one upon receipt of h1
transfer command. |
void |
port(int h1,
int h2,
int h3,
int h4,
int port)
Data port
The argument is a HOST-PORT specification for the data port
to be used in data connection. |
java.lang.String |
pwd()
Print working directory
This command causes the name of the current working
directory to be returned in the reply. |
void |
quit()
Quit
This command terminates a USER and if file transfer is not
in progress, the server closes the control connection. |
void |
rein()
Reinitialize
This command terminates a USER, flushing all I/O and account
information, except to allow any transfer in progress to be
completed. |
void |
rest(java.lang.String marker)
Restart file transfer
The argument field represents the server marker at which
file transfer is to be restarted. |
void |
retr(java.io.OutputStream outputStream,
java.lang.String filename)
Retrieve
This command causes the server-DTP to transfer a copy of the
file, specified in the pathname, to the server- or user-DTP
at the other end of the data connection. |
void |
rmd(java.lang.String pathname)
Remove directory
This command causes the directory specified in the pathname
to be removed as a directory (if the pathname is absolute)
or as a subdirectory of the current working directory (if
the pathname is relative). |
void |
rnfr(java.lang.String pathname)
Rename from
This command specifies the old pathname of the file which is
to be renamed. |
void |
rnto(java.lang.String pathname)
Rename to
This command specifies the new pathname of the file
specified in the immediately preceding "rename from"
command. |
void |
site()
Site parameters
This command is used by the server to provide services
specific to his system that are essential to file transfer
but not sufficiently universal to be included as commands in
the protocol. |
void |
smnt(java.lang.String pathname)
Structure mount
This command allows the user to mount a different file
system data structure without altering his login or
accounting information. |
void |
stat(java.lang.String pathname)
Status
This command shall cause a status response to be sent over
the control connection in the form of a reply. |
void |
stor(java.io.InputStream is,
java.lang.String filename)
Store
This command causes the server-DTP to accept the data
transferred via the data connection and to store the data as
a file at the server site. |
void |
stou(java.io.InputStream is,
java.lang.String filename)
Store unique
This command behaves like STOR except that the resultant
file is to be created in the current directory under a name
unique to that directory. |
void |
stru(char structure)
File structure
The argument is a single Telnet character code specifying
file structure described in the Section on Data
Representation and Storage. |
void |
syst()
System
This command is used to find out the type of operating
system at the server. |
void |
type(char type)
Calls type(type, 8) ( see type(char type, int bytesize) ) |
void |
type(char type,
int bytesize)
Set transfer type. |
void |
user(java.lang.String user)
User name
The argument field is a Telnet string identifying the user. |
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
RESP_ALL
public static final int RESP_ALL
- See Also:
- Constant Field Values
Ftp2Me
public Ftp2Me(java.lang.String host)
throws java.io.IOException,
FtpProtocolException
- Create an instance of Ftp2Me.
Connects to the given host, at port 21
User/pass/acct must be issued manually
- Parameters:
host
- Name of the host to connect to
- Throws:
IOException,
- FtpProtocolException
java.io.IOException
FtpProtocolException
Ftp2Me
public Ftp2Me(java.lang.String host,
int port)
throws java.io.IOException,
FtpProtocolException
- Create an instance of Ftp2Me.
Connects to the given host and port
User/pass/acct must be issued manually
- Parameters:
host
- Name of the host to connect toport
- Port on the host to connect to
- Throws:
IOException,
- FtpProtocolException
java.io.IOException
FtpProtocolException
Ftp2Me
public Ftp2Me(java.lang.String host,
int port,
java.lang.String user,
java.lang.String pass)
throws java.io.IOException,
FtpProtocolException
- Create an instance of Ftp2Me.
Issues the USER and PASS commands
- Parameters:
host
- Name of the host to connect toport
- Port on the host to connect touser
- Username to use for loginpass
- Password to use for login
- Throws:
IOException,
- FtpProtocolException
java.io.IOException
FtpProtocolException
Ftp2Me
public Ftp2Me(java.lang.String host,
int port,
java.lang.String user,
java.lang.String pass,
java.lang.String acct)
throws java.io.IOException,
FtpProtocolException
- Create an instance of Ftp2Me.
Issues the USER, PASS and ACCT commands
- Parameters:
host
- Name of the host to connect toport
- Port on the host to connect touser
- Username to use for loginpass
- Password to use for loginacct
- Account name to use with acct command
- Throws:
IOException,
- FtpProtocolException
java.io.IOException
FtpProtocolException
disconnect
public void disconnect()
- Disconnects from the FTP server.
Does NOT send the QUIT command, just closes the
communication channels. It does not throw any
exceptions or return error codes, it designed to
be a "fire and forget" method.
abor
public boolean abor()
throws java.io.IOException,
FtpProtocolException
- Abort
This command tells the server to abort the previous FTP
service command and any associated transfer of data. The
abort command may require "special action", as discussed in
the RFC959 "Section on FTP Commands", to force recognition
by the server. No action is to be taken if the previous command
has been completed (including data transfer). The control
connection is not to be closed by the server, but the data
connection must be closed.
There are two cases for the server upon receipt of this
command: (1) the FTP service command was already completed,
or (2) the FTP service command is still in progress.
In the first case, the server closes the data connection
(if it is open) and responds with a 226 reply, indicating
that the abort command was successfully processed.
In the second case, the server aborts the FTP service in
progress and closes the data connection, returning a 426
reply to indicate that the service request terminated
abnormally. The server then sends a 226 reply,
indicating that the abort command was successfully
processed.
- Throws:
java.io.IOException
FtpProtocolException
acct
public void acct(java.lang.String account)
throws java.io.IOException,
FtpProtocolException
- Account
The argument field is a Telnet string identifying the user’s
account. The command is not necessarily related to the USER
command, as some sites may require an account for login and
others only for specific access, such as storing files. In
the latter case the command may arrive at any time.
There are reply codes to differentiate these cases for the
automation: when account information is required for login,
the response to a successful PASSword command is reply code
332. On the other hand, if account information is NOT
required for login, the reply to a successful PASSword
command is 230; and if the account information is needed for
a command issued later in the dialogue, the server should
return a 332 or 532 reply depending on whether it stores
(pending receipt of the ACCounT command) or discards the
command, respectively.
- Throws:
java.io.IOException
FtpProtocolException
allo
public boolean allo(long size,
long maxRecordSize)
throws java.io.IOException,
FtpProtocolException
- Allocate
This command may be required by some servers to reserve
sufficient storage to accommodate the new file to be
transferred. The argument shall be a decimal integer
representing the number of bytes (using the logical byte
size) of storage to be reserved for the file. For files
sent with record or page structure a maximum record or page
size (in logical bytes) might also be necessary; this is
indicated by a decimal integer in a second argument field of
the command. This second argument is optional, but when
present should be separated from the first by the three
Telnet characters R . This command shall be
followed by a STORe or APPEnd command. The ALLO command
should be treated as a NOOP (no operation) by those servers
which do not require that the maximum size of the file be
declared beforehand, and those servers interested in only
the maximum record or page size should accept a dummy value
in the first argument and ignore it.
- Throws:
java.io.IOException
FtpProtocolException
appe
public void appe(java.io.InputStream is,
java.lang.String filename)
throws java.io.IOException,
FtpProtocolException
- Append (with create)
This command causes the server-DTP to accept the data
transferred via the data connection and to store the data in
a file at the server site. If the file specified in the
pathname exists at the server site, then the data shall be
appended to that file; otherwise the file specified in the
pathname shall be created at the server site.
- Throws:
java.io.IOException
FtpProtocolException
cdup
public void cdup()
throws java.io.IOException,
FtpProtocolException
- Change to parent directory
This command is a special case of CWD, and is included to
simplify the implementation of programs for transferring
directory trees between operating systems having different
syntaxes for naming the parent directory. The reply codes
shall be identical to the reply codes of CWD. See
Appendix II for further details.
- Throws:
java.io.IOException
FtpProtocolException
cwd
public void cwd(java.lang.String dir)
throws java.io.IOException,
FtpProtocolException
- Changes the working directory
This command allows the user to work with a different
directory or dataset for file storage or retrieval without
altering his login or accounting information. Transfer
parameters are similarly unchanged. The argument is h1
pathname specifying a directory or other system dependent
file group designator.
- Throws:
java.io.IOException
FtpProtocolException
dele
public void dele(java.lang.String filename)
throws java.io.IOException,
FtpProtocolException
- Delete
This command causes the file specified in the pathname to be
deleted at the server site. If an extra level of protection
is desired (such as the query, "Do you really wish to
delete?"), it should be provided by the user-FTP process.
- Throws:
java.io.IOException
FtpProtocolException
help
public void help(java.lang.String command)
throws java.io.IOException,
FtpProtocolException
- Help
This command shall cause the server to send helpful
information regarding its implementation status over the
control connection to the user. The command may take an
argument (e.g., any command name) and return more specific
information as a response. The reply is type 211 or 214.
It is suggested that HELP be allowed before entering a USER
command. The server may use this reply to specify
site-dependent parameters, e.g., in response to HELP SITE.
- Throws:
java.io.IOException
FtpProtocolException
list
public java.util.Enumeration list()
throws java.io.IOException,
FtpProtocolException
- List
This command causes a list to be sent from the server to the
passive DTP. If the pathname specifies a directory or other
group of files, the server should transfer a list of files
in the specified directory. If the pathname specifies h1
file then the server should send current information on the
file. A null argument implies the user’s current working or
default directory. The data transfer is over the data
connection in type ASCII or type EBCDIC. (The user must
ensure that the TYPE is appropriately ASCII or EBCDIC).
Since the information on a file may vary widely from system
to system, this information may be hard to use automatically
in a program, but may be quite useful to a human user.
The file names and details are given as an enumeration of
Strings.
- Throws:
java.io.IOException
FtpProtocolException
mkd
public void mkd(java.lang.String pathname)
throws java.io.IOException,
FtpProtocolException
- Make directory
This command causes the directory specified in the pathname
to be created as a directory (if the pathname is absolute)
or as a subdirectory of the current working directory (if
the pathname is relative).
- Throws:
java.io.IOException
FtpProtocolException
mode
public void mode(char mode)
throws java.io.IOException,
FtpProtocolException
- Transfer mode
The argument is a single Telnet character code specifying
the data transfer modes described in the Section on
Transmission Modes.
The following codes are assigned for transfer modes:
S - Stream
B - Block
C - Compressed
The default transfer mode is Stream.
- Throws:
java.io.IOException
FtpProtocolException
nlst
public java.util.Enumeration nlst()
throws java.io.IOException,
FtpProtocolException
- Name list
This command causes a directory listing to be sent from
server to user site. The pathname should specify h1
directory or other system-specific file group descriptor; h1
null argument implies the current directory. The server
will return a stream of names of files and no other
information. The data will be transferred in ASCII or
EBCDIC type over the data connection as valid pathname
strings separated by or . (Again the user must
ensure that the TYPE is correct.) This command is intended
to return information that can be used by a program to
further process the files automatically. For example, in
the implementation of a "multiple get" function.
File names returned as an enumeration of Strings.
- Throws:
java.io.IOException
FtpProtocolException
noop
public void noop()
throws java.io.IOException,
FtpProtocolException
- No operation
This command does not affect any parameters or previously
entered commands. It specifies no action other than that the
server send an OK reply.
- Throws:
java.io.IOException
FtpProtocolException
pass
public void pass(java.lang.String pass)
throws java.io.IOException,
FtpProtocolException
- Password
The argument field is a Telnet string specifying the user’s
password. This command must be immediately preceded by the
user name command, and, for some sites, completes the user’s
identification for access control. Since password
information is quite sensitive, it is desirable in general
to "mask" it or suppress typeout. It appears that the
server has no foolproof way to achieve this. It is
therefore the responsibility of the user-FTP process to hide
the sensitive password information.
- Throws:
java.io.IOException
FtpProtocolException
pasv
public PasvInfo pasv()
throws java.io.IOException,
FtpProtocolException
- Passive
This command requests the server-DTP to "listen" on a data
port (which is not its default data port) and to wait for h1
connection rather than initiate one upon receipt of h1
transfer command. The response to this command includes the
host and port address this server is listening on.
- Throws:
java.io.IOException
FtpProtocolException
port
public void port(int h1,
int h2,
int h3,
int h4,
int port)
throws java.io.IOException,
FtpProtocolException
- Data port
The argument is a HOST-PORT specification for the data port
to be used in data connection. There are defaults for both
the user and server data ports, and under normal
circumstances this command and its reply are not needed. If
this command is used, the argument is the concatenation of h1
32-bit internet host address and a 16-bit TCP port address.
This address information is broken into 8-bit fields and the
value of each field is transmitted as a decimal number (in
character string representation). The fields are separated
by commas. A port command would be:
PORT h1,h2,h3,h4,p1,p2
where a is the high order 8 bits of the internet host
address.
- Throws:
java.io.IOException
FtpProtocolException
pwd
public java.lang.String pwd()
throws java.io.IOException,
FtpProtocolException
- Print working directory
This command causes the name of the current working
directory to be returned in the reply.
- Throws:
java.io.IOException
FtpProtocolException
quit
public void quit()
throws java.io.IOException,
FtpProtocolException
- Quit
This command terminates a USER and if file transfer is not
in progress, the server closes the control connection. If
file transfer is in progress, the connection will remain
open for result response and the server will then close it.
If the user-process is transferring files for several USERs
but does not wish to close and then reopen connections for
each, then the REIN command should be used instead of QUIT.
An unexpected close on the control connection will cause the
server to take the effective action of an abort (ABOR) and a
logout (QUIT).
- Throws:
java.io.IOException
FtpProtocolException
rein
public void rein()
throws java.io.IOException,
FtpProtocolException
- Reinitialize
This command terminates a USER, flushing all I/O and account
information, except to allow any transfer in progress to be
completed. All parameters are reset to the default settings
and the control connection is left open. This is identical
to the state in which a user finds himself immediately after
the control connection is opened. A USER command may be
expected to follow.
- Throws:
java.io.IOException
FtpProtocolException
rest
public void rest(java.lang.String marker)
throws java.io.IOException,
FtpProtocolException
- Restart file transfer
The argument field represents the server marker at which
file transfer is to be restarted. This command does not
cause file transfer but skips over the file to the specified
data checkpoint. This command shall be immediately followed
by the appropriate FTP service command which shall cause
file transfer to resume.
- Throws:
java.io.IOException
FtpProtocolException
retr
public void retr(java.io.OutputStream outputStream,
java.lang.String filename)
throws java.io.IOException,
FtpProtocolException
- Retrieve
This command causes the server-DTP to transfer a copy of the
file, specified in the pathname, to the server- or user-DTP
at the other end of the data connection. The status and
contents of the file at the server site shall be unaffected.
- Throws:
java.io.IOException
FtpProtocolException
rmd
public void rmd(java.lang.String pathname)
throws java.io.IOException,
FtpProtocolException
- Remove directory
This command causes the directory specified in the pathname
to be removed as a directory (if the pathname is absolute)
or as a subdirectory of the current working directory (if
the pathname is relative).
- Throws:
java.io.IOException
FtpProtocolException
rnfr
public void rnfr(java.lang.String pathname)
throws java.io.IOException,
FtpProtocolException
- Rename from
This command specifies the old pathname of the file which is
to be renamed. This command must be immediately followed by
a "rename to" command specifying the new file pathname.
- Throws:
java.io.IOException
FtpProtocolException
rnto
public void rnto(java.lang.String pathname)
throws java.io.IOException,
FtpProtocolException
- Rename to
This command specifies the new pathname of the file
specified in the immediately preceding "rename from"
command. Together the two commands cause a file to be
renamed.
- Throws:
java.io.IOException
FtpProtocolException
site
public void site()
throws java.io.IOException,
FtpProtocolException
- Site parameters
This command is used by the server to provide services
specific to his system that are essential to file transfer
but not sufficiently universal to be included as commands in
the protocol. The nature of these services and the
specification of their syntax can be stated in a reply to
the HELP SITE command.
- Throws:
java.io.IOException
FtpProtocolException
smnt
public void smnt(java.lang.String pathname)
throws java.io.IOException,
FtpProtocolException
- Structure mount
This command allows the user to mount a different file
system data structure without altering his login or
accounting information. Transfer parameters are similarly
unchanged. The argument is a pathname specifying h1
directory or other system dependent file group designator.
- Throws:
java.io.IOException
FtpProtocolException
stat
public void stat(java.lang.String pathname)
throws java.io.IOException,
FtpProtocolException
- Status
This command shall cause a status response to be sent over
the control connection in the form of a reply. The command
may be sent during a file transfer (along with the Telnet IP
and Synch signals--see the Section on FTP Commands) in which
case the server will respond with the status of the
operation in progress, or it may be sent between file
transfers. In the latter case, the command may have an
argument field. If the argument is ha1 pathname, the command
is analogous to the "list" command except that data shall be
transferred over the control connection. If a partial
pathname is given, the server may respond with a list of
file names or attributes associated with that specification.
If no argument is given, the server should return general
status information about the server FTP process. This
should include current values of all transfer parameters and
the status of connections.
- Throws:
java.io.IOException
FtpProtocolException
stor
public void stor(java.io.InputStream is,
java.lang.String filename)
throws java.io.IOException,
FtpProtocolException
- Store
This command causes the server-DTP to accept the data
transferred via the data connection and to store the data as
a file at the server site. If the file specified in the
pathname exists at the server site, then its contents shall
be replaced by the data being transferred. A new file is
created at the server site if the file specified in the
pathname does not already exist.
- Throws:
java.io.IOException
FtpProtocolException
stou
public void stou(java.io.InputStream is,
java.lang.String filename)
throws java.io.IOException,
FtpProtocolException
- Store unique
This command behaves like STOR except that the resultant
file is to be created in the current directory under a name
unique to that directory. The 250 Transfer Started response
must include the name generated.
- Throws:
java.io.IOException
FtpProtocolException
stru
public void stru(char structure)
throws java.io.IOException,
FtpProtocolException
- File structure
The argument is a single Telnet character code specifying
file structure described in the Section on Data
Representation and Storage.
The following codes are assigned for structure:
F - File (no record structure)
R - Record structure
P - Page structure
The default structure is File.
- Throws:
java.io.IOException
FtpProtocolException
syst
public void syst()
throws java.io.IOException,
FtpProtocolException
- System
This command is used to find out the type of operating
system at the server. The reply shall have as its first
word one of the system names listed in the current version
of the Assigned Numbers document (Reynolds, Joyce, and
Jon Postel, "Assigned Numbers", RFC 943, ISI, April 1985).
- Throws:
java.io.IOException
FtpProtocolException
type
public void type(char type)
throws java.io.IOException,
FtpProtocolException
- Calls type(type, 8) ( see type(char type, int bytesize) )
- Throws:
java.io.IOException
FtpProtocolException
type
public void type(char type,
int bytesize)
throws java.io.IOException,
FtpProtocolException
- Set transfer type. Valid types are:
A(SCII)
E(BCDIC)
I(MAGE)
L(OCAL < byte size >)
N(on-print)
T(elnet format effector)
C(arriage Control)
- Throws:
java.io.IOException
FtpProtocolException
user
public void user(java.lang.String user)
throws java.io.IOException,
FtpProtocolException
- User name
The argument field is a Telnet string identifying the user.
The user identification is that which is required by the
server for access to its file system. This command will
normally be the first command transmitted by the user after
the control connections are made (some servers may require
this). Additional identification information in the form of
a password and/or an account command may also be required by
some servers. Servers may allow a new USER command to be
entered at any point in order to change the access control
and/or accounting information. This has the effect of
flushing any user, password, and account information already
supplied and beginning the login sequence again. All
transfer parameters are unchanged and any file transfer in
progress is completed under the old access control
parameters.
- Throws:
java.io.IOException
FtpProtocolException
getLastMessage
public java.lang.String getLastMessage()
- Returns the last message from the server. Works for
multi-line responses too
expectResponse
public void expectResponse(int expectedCode)
throws java.io.IOException,
FtpProtocolException
- Gets a response. If the response code not equals with
the given number, throws an FtpProtocolException
- Throws:
java.io.IOException
FtpProtocolException
isPositivePreliminary
public boolean isPositivePreliminary()
- Is the last message a positive preliminary reply?
The requested action is being initiated; expect another
reply before proceeding with a new command. (The
user-process sending another command before the
completion reply would be in violation of protocol; but
server-FTP processes should queue any commands that
arrive while a preceding command is in progress.) This
type of reply can be used to indicate that the command
was accepted and the user-process may now pay attention
to the data connections, for implementations where
simultaneous monitoring is difficult. The server-FTP
process may send at most, one 1yz reply per command.
isPositiveCompletion
public boolean isPositiveCompletion()
- Is the last message a positive completion reply?
The requested action has been successfully completed. A
new request may be initiated.
isPositiveIntermediate
public boolean isPositiveIntermediate()
- Is the last message a positive intermediate reply?
The command has been accepted, but the requested action
is being held in abeyance, pending receipt of further
information. The user should send another command
specifying this information. This reply is used in
command sequence groups.
isNegativeTransient
public boolean isNegativeTransient()
- Is the last message a negative transient reply?
The command was not accepted and the requested action did
not take place, but the error condition is temporary and
the action may be requested again. The user should
return to the beginning of the command sequence, if any.
It is difficult to assign a meaning to "transient",
particularly when two distinct sites (Server- and
User-processes) have to agree on the interpretation.
Each reply in the 4yz category might have a slightly
different time value, but the intent is that the
user-process is encouraged to try again. A rule of thumb
in determining if a reply fits into the 4yz or the 5yz
(Permanent Negative) category is that replies are 4yz if
the commands can be repeated without any change in
command form or in properties of the User or Server
(e.g., the command is spelled the same with the same
arguments used; the user does not change his file access
or user name; the server does not put up a new
implementation.)
isNegativePermanent
public boolean isNegativePermanent()
- Is the last message a negative permanent reply?
The command was not accepted and the requested action did
not take place. The User-process is discouraged from
repeating the exact request (in the same sequence). Even
some "permanent" error conditions can be corrected, so
the human user may want to direct his User-process to
reinitiate the command sequence by direct action at some
point in the future (e.g., after the spelling has been
changed, or the user has altered his directory status.)