Package org.apache.qpid.protonj2.codec.encoders.messaging

Class HeaderTypeEncoder

java.lang.Object

org.apache.qpid.protonj2.codec.encoders.AbstractDescribedTypeEncoder<V>

org.apache.qpid.protonj2.codec.encoders.AbstractDescribedListTypeEncoder<Header>

org.apache.qpid.protonj2.codec.encoders.messaging.HeaderTypeEncoder

All Implemented Interfaces:

DescribedTypeEncoder<Header>, TypeEncoder<Header>

public final class HeaderTypeEncoder
extends AbstractDescribedListTypeEncoder<Header>

Encoder of AMQP Header type values to a byte stream

Constructor Summary

Constructors

Constructor	Description
HeaderTypeEncoder()

Method Summary

Modifier and Type	Method	Description
UnsignedLong	getDescriptorCode()
Symbol	getDescriptorSymbol()
int	getElementCount(Header header)	Gets the number of elements that will result when this type is encoded into an AMQP List type.
byte	getListEncoding(Header value)	Determine the list type the given value can be encoded to based on the number of bytes that would be needed to hold the encoded form of the resulting list entries.
Class<Header>	getTypeClass()
void	writeElement(Header header, int index, ProtonBuffer buffer, Encoder encoder, EncoderState state)	Instructs the encoder to write the element identified with the given index

Methods inherited from class org.apache.qpid.protonj2.codec.encoders.AbstractDescribedListTypeEncoder

getMinElementCount, writeArray, writeRawArray, writeType

Methods inherited from class org.apache.qpid.protonj2.codec.encoders.AbstractDescribedTypeEncoder

isArrayType

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.qpid.protonj2.codec.DescribedTypeEncoder

encoderRegistered

Constructor Details

HeaderTypeEncoder

public HeaderTypeEncoder()

Method Details

getTypeClass

public Class<Header> getTypeClass()

Returns:

the Class type that this encoder handles.

getDescriptorCode

public UnsignedLong getDescriptorCode()

Returns:

the UnsignedLong value to use as the Descriptor for this type.

getDescriptorSymbol

public Symbol getDescriptorSymbol()

Returns:

the Symbol value to use as the Descriptor for this type.

getListEncoding

public byte getListEncoding(Header value)

Description copied from class: AbstractDescribedListTypeEncoder

Determine the list type the given value can be encoded to based on the number of bytes that would be needed to hold the encoded form of the resulting list entries.

Most encoders will return LIST32 but for cases where the type is known to be encoded to LIST8 or always encodes an empty list (LIST0) the encoder can optimize the encode step and not compute sizes.

Overrides:

getListEncoding in class AbstractDescribedListTypeEncoder<Header>

Parameters:

value - The value that is to be encoded.

Returns:

the encoding code of the list type encoding needed for this object.

writeElement

public void writeElement(Header header,
 int index,
 ProtonBuffer buffer,
 Encoder encoder,
 EncoderState state)

Description copied from class: AbstractDescribedListTypeEncoder

Instructs the encoder to write the element identified with the given index

Specified by:

writeElement in class AbstractDescribedListTypeEncoder<Header>

Parameters:

header - the source of the list elements to write

index - the element index that needs to be written

buffer - the buffer to write the element to

encoder - the current Encoder value to use.

state - the current EncoderState value to use.

getElementCount

public int getElementCount(Header header)

Description copied from class: AbstractDescribedListTypeEncoder

Gets the number of elements that will result when this type is encoded into an AMQP List type.

Specified by:

getElementCount in class AbstractDescribedListTypeEncoder<Header>

Parameters:

header - the value which will be encoded as a list type.

Returns:

the number of elements that should comprise the encoded list.