javax.jmdns.impl

Class DNSMessage

java.lang.Object

javax.jmdns.impl.DNSMessage

Direct Known Subclasses:

DNSIncoming, DNSOutgoing

public abstract class DNSMessage
extends java.lang.Object

DNSMessage define a DNS message either incoming or outgoing.

Author:

Werner Randelshofer, Rick Blair, Pierre Frisch

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.List<DNSRecord>	_additionals
protected java.util.List<DNSRecord>	_answers
protected java.util.List<DNSRecord>	_authoritativeAnswers
protected java.util.List<DNSQuestion>	_questions
static boolean	MULTICAST
static boolean	UNICAST

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DNSMessage(int flags, int id, boolean multicast)

Method Summary

Methods

Modifier and Type	Method and Description
java.util.Collection<? extends DNSRecord>	getAdditionals()
java.util.Collection<? extends DNSRecord>	getAllAnswers()
java.util.Collection<? extends DNSRecord>	getAnswers()
java.util.Collection<? extends DNSRecord>	getAuthorities()
int	getFlags()
int	getId()
int	getNumberOfAdditionals()
int	getNumberOfAnswers()
int	getNumberOfAuthorities()
int	getNumberOfQuestions()
int	getOperationCode() Returns the operation code value.
java.util.Collection<? extends DNSQuestion>	getQuestions()
boolean	isAuthoritativeAnswer() Check if the message is an authoritative answer.
boolean	isEmpty() Check if the message is empty
boolean	isMulticast()
boolean	isQuery() Check if the message is a query.
boolean	isResponse() Check if the message is a response.
boolean	isTruncated() Check if the message is truncated.
boolean	isValidResponseCode() Check is the response code is valid The only valid value is zero all other values signify an error and the message must be ignored.
protected java.lang.String	print(byte[] data) Debugging.
void	setFlags(int flags)
void	setId(int id)

Methods inherited from class java.lang.Object

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

Field Detail

MULTICAST

public static final boolean MULTICAST

See Also:

Constant Field Values

UNICAST

public static final boolean UNICAST

See Also:

Constant Field Values

_questions

protected final java.util.List<DNSQuestion> _questions

_answers

protected final java.util.List<DNSRecord> _answers

_authoritativeAnswers

protected final java.util.List<DNSRecord> _authoritativeAnswers

_additionals

protected final java.util.List<DNSRecord> _additionals

Constructor Detail

DNSMessage

protected DNSMessage(int flags,
          int id,
          boolean multicast)

Parameters:

flags -

id -

multicast -

Method Detail

getId

public int getId()

Returns:

message id

setId

public void setId(int id)

Parameters:

id - the id to set

getFlags

public int getFlags()

Returns:

message flags

setFlags

public void setFlags(int flags)

Parameters:

flags - the flags to set

isMulticast

public boolean isMulticast()

Returns:

true if multicast

getQuestions

public java.util.Collection<? extends DNSQuestion> getQuestions()

Returns:

list of questions

getNumberOfQuestions

public int getNumberOfQuestions()

Returns:

number of questions in the message

getAllAnswers

public java.util.Collection<? extends DNSRecord> getAllAnswers()

getAnswers

public java.util.Collection<? extends DNSRecord> getAnswers()

Returns:

list of answers

getNumberOfAnswers

public int getNumberOfAnswers()

Returns:

number of answers in the message

getAuthorities

public java.util.Collection<? extends DNSRecord> getAuthorities()

Returns:

list of authorities

getNumberOfAuthorities

public int getNumberOfAuthorities()

Returns:

number of authorities in the message

getAdditionals

public java.util.Collection<? extends DNSRecord> getAdditionals()

Returns:

list of additional answers

getNumberOfAdditionals

public int getNumberOfAdditionals()

Returns:

number of additional in the message

isValidResponseCode

public boolean isValidResponseCode()

Check is the response code is valid
The only valid value is zero all other values signify an error and the message must be ignored.

Returns:

true if the message has a valid response code.

getOperationCode

public int getOperationCode()

Returns the operation code value. Currently only standard query 0 is valid.

Returns:

The operation code value.

isTruncated

public boolean isTruncated()

Check if the message is truncated.

Returns:

true if the message was truncated

isAuthoritativeAnswer

public boolean isAuthoritativeAnswer()

Check if the message is an authoritative answer.

Returns:

true if the message is an authoritative answer

isQuery

public boolean isQuery()

Check if the message is a query.

Returns:

true is the message is a query

isResponse

public boolean isResponse()

Check if the message is a response.

Returns:

true is the message is a response

isEmpty

public boolean isEmpty()

Check if the message is empty

Returns:

true is the message is empty

print

protected java.lang.String print(byte[] data)

Debugging.

Parameters:

data -

Returns:

data dump