Package io.hekate.messaging

Class MessageMetaData

java.lang.Object

io.hekate.messaging.MessageMetaData

public class MessageMetaData
extends Object

Message meta-data.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	MessageMetaData.Key<T>	Key of a MessageMetaData's attribute.
static interface	MessageMetaData.MetaDataCodec<T>	Codec for MessageMetaData values.

Constructor Summary

Constructors

Constructor	Description
MessageMetaData()	Constructs a new instance.

Method Summary

Modifier and Type	Method	Description
<T> T	get(MessageMetaData.Key<T> key)	Returns the value of the specified key.
boolean	isEmpty()	Returns true if this instance doesn't hold any key/value pairs.
static MessageMetaData	readFrom(DataReader in)	Reads a MessageMetaData from the specified reader.
<T> void	set(MessageMetaData.Key<T> key, T value)	Sets the key/value pair.
int	size()	Returns the amount of key/value pairs of this instance.
String	toString()
void	writeTo(DataWriter out)	Writes the content of this instance into the specified writer.

Methods inherited from class java.lang.Object

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

Constructor Detail

MessageMetaData

public MessageMetaData()

Constructs a new instance.

Method Detail

readFrom

public static MessageMetaData readFrom(DataReader in)
                                throws IOException

Reads a MessageMetaData from the specified reader.

Parameters:

in - Reader.

Returns:

An instance if MessageMetaData that was decoded from the reader.

Throws:

IOException - if failed to read data.

writeTo

public void writeTo(DataWriter out)
             throws IOException

Writes the content of this instance into the specified writer.

Parameters:

out - Writer.

Throws:

IOException - if failed to write data.

See Also:

readFrom(DataReader)

get

public <T> T get(MessageMetaData.Key<T> key)

Returns the value of the specified key. Returns null if such key doesn't exist.

Type Parameters:

T - Value type.

Parameters:

key - Key.

Returns:

Value for the specified key or null.

set

public <T> void set(MessageMetaData.Key<T> key,
                    T value)

Sets the key/value pair. If key already exists then its value will be overwritten.

Type Parameters:

T - Value type.

Parameters:

key - Key.

value - Value.

size

public int size()

Returns the amount of key/value pairs of this instance.

Returns:

Amount of key/value pairs of this instance.

isEmpty

public boolean isEmpty()

Returns true if this instance doesn't hold any key/value pairs.

Returns:

true if this instance doesn't hold any key/value pairs.

toString

public String toString()

Overrides:

toString in class Object