io.netty.handler.codec.dns

Class DefaultDnsRecordDecoder

java.lang.Object

io.netty.handler.codec.dns.DefaultDnsRecordDecoder

All Implemented Interfaces:

DnsRecordDecoder

@UnstableApi
public class DefaultDnsRecordDecoder
extends Object
implements DnsRecordDecoder

The default DnsRecordDecoder implementation.

See Also:

DefaultDnsRecordEncoder

Field Summary

Fields inherited from interface io.netty.handler.codec.dns.DnsRecordDecoder

DEFAULT

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DefaultDnsRecordDecoder() Creates a new instance.

Method Summary

Modifier and Type	Method and Description
static String	decodeName(ByteBuf in) Retrieves a domain name given a buffer containing a DNS packet.
protected String	decodeName0(ByteBuf in) Retrieves a domain name given a buffer containing a DNS packet.
DnsQuestion	decodeQuestion(ByteBuf in) Decodes a DNS question into its object representation.
<T extends DnsRecord> T	decodeRecord(ByteBuf in) Decodes a DNS record into its object representation.
protected DnsRecord	decodeRecord(String name, DnsRecordType type, int dnsClass, long timeToLive, ByteBuf in, int offset, int length) Decodes a record from the information decoded so far by decodeRecord(ByteBuf).

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultDnsRecordDecoder

protected DefaultDnsRecordDecoder()

Creates a new instance.

Method Detail

decodeQuestion

public final DnsQuestion decodeQuestion(ByteBuf in)
                                 throws Exception

Description copied from interface: DnsRecordDecoder

Decodes a DNS question into its object representation.

Specified by:

decodeQuestion in interface DnsRecordDecoder

Parameters:

in - the input buffer which contains a DNS question at its reader index

Throws:

Exception

decodeRecord

public final <T extends DnsRecord> T decodeRecord(ByteBuf in)
                                           throws Exception

Description copied from interface: DnsRecordDecoder

Decodes a DNS record into its object representation.

Specified by:

decodeRecord in interface DnsRecordDecoder

Parameters:

in - the input buffer which contains a DNS record at its reader index

Returns:

the decoded record, or null if there are not enough data in the input buffer

Throws:

Exception

decodeRecord

protected DnsRecord decodeRecord(String name,
                                 DnsRecordType type,
                                 int dnsClass,
                                 long timeToLive,
                                 ByteBuf in,
                                 int offset,
                                 int length)
                          throws Exception

Decodes a record from the information decoded so far by decodeRecord(ByteBuf).

Parameters:

name - the domain name of the record

type - the type of the record

dnsClass - the class of the record

timeToLive - the TTL of the record

in - the ByteBuf that contains the RDATA

offset - the start offset of the RDATA in in

length - the length of the RDATA

Returns:

a DnsRawRecord. Override this method to decode RDATA and return other record implementation.

Throws:

Exception

decodeName0

protected String decodeName0(ByteBuf in)

Retrieves a domain name given a buffer containing a DNS packet. If the name contains a pointer, the position of the buffer will be set to directly after the pointer's index after the name has been read.

Parameters:

in - the byte buffer containing the DNS packet

Returns:

the domain name for an entry

decodeName

public static String decodeName(ByteBuf in)

Retrieves a domain name given a buffer containing a DNS packet. If the name contains a pointer, the position of the buffer will be set to directly after the pointer's index after the name has been read.

Parameters:

in - the byte buffer containing the DNS packet

Returns:

the domain name for an entry