io.cloudevents.core.message.impl

Class MessageUtils

java.lang.Object

io.cloudevents.core.message.impl.MessageUtils

public class MessageUtils
extends Object

Collection of utilities useful to implement MessageReader and MessageWriter related code.

Constructor Summary

Constructors

Constructor and Description
MessageUtils()

Method Summary

Modifier and Type	Method and Description
static <V> Map<String,V>	generateAttributesToHeadersMapping(Function<String,V> headerNameMapping) Generate a map with cloudevents attributes as keys and header keys as values
static IllegalStateException	generateWrongEncoding(Encoding expected, Encoding actual)
static MessageReader	parseStructuredOrBinaryMessage(Supplier<String> contentTypeHeaderReader, Function<EventFormat,MessageReader> structuredMessageFactory, Supplier<String> specVersionHeaderReader, Function<SpecVersion,MessageReader> binaryMessageFactory) Common flow to parse an incoming message that could be structured or binary.

Methods inherited from class java.lang.Object

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

Constructor Detail

MessageUtils

public MessageUtils()

Method Detail

parseStructuredOrBinaryMessage

public static MessageReader parseStructuredOrBinaryMessage(Supplier<String> contentTypeHeaderReader,
                                                           Function<EventFormat,MessageReader> structuredMessageFactory,
                                                           Supplier<String> specVersionHeaderReader,
                                                           Function<SpecVersion,MessageReader> binaryMessageFactory)
                                                    throws CloudEventRWException

Common flow to parse an incoming message that could be structured or binary.

Parameters:

contentTypeHeaderReader - supplier that returns the content type header, if any

structuredMessageFactory - factory to create the structured MessageReader from the provided EventFormat

specVersionHeaderReader - supplier that returns the spec version header, if any

binaryMessageFactory - factory to create the binary MessageReader from the provided SpecVersion

Returns:

the instantiated MessageReader

Throws:

CloudEventRWException - if something goes wrong while resolving the SpecVersion or if the message has unknown encoding

generateAttributesToHeadersMapping

public static <V> Map<String,V> generateAttributesToHeadersMapping(Function<String,V> headerNameMapping)

Generate a map with cloudevents attributes as keys and header keys as values

Type Parameters:

V - Header key type

Parameters:

headerNameMapping - mapper to generate the header name

Returns:

the generated mapping

generateWrongEncoding

public static IllegalStateException generateWrongEncoding(Encoding expected,
                                                          Encoding actual)

Parameters:

expected - the expected encoding

actual - the actual encoding

Returns:

a new instance of IllegalStateException.