io.cloudevents.amqp.impl

Class AmqpConstants

java.lang.Object

io.cloudevents.amqp.impl.AmqpConstants

public final class AmqpConstants
extends Object

Constants and methods used throughout the Proton-based implementation of the AMQP 1.0 protocol binding for cloud events.

Field Summary

Fields

Modifier and Type	Field and Description
static String	APP_PROPERTY_SPEC_VERSION
static Map<String,String>	ATTRIBUTES_TO_PROPERTYNAMES Map a cloud event attribute name to a value.
static String	CE_PREFIX The prefix name for CloudEvent attributes for use in the application-properties section of an AMQP 1.0 message.
static String	PROPERTY_CONTENT_TYPE The AMQP 1.0 content-type message property

Method Summary

Modifier and Type	Method and Description
static <T> T	getApplicationProperty(ApplicationProperties props, String name, Class<T> type) Gets the value of a specific application property.
static byte[]	getPayloadAsByteArray(Section payload) Parses a message payload into a byte array.

Methods inherited from class java.lang.Object

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

Field Detail

CE_PREFIX

public static final String CE_PREFIX

The prefix name for CloudEvent attributes for use in the application-properties section of an AMQP 1.0 message.

See Also:

Constant Field Values

PROPERTY_CONTENT_TYPE

public static final String PROPERTY_CONTENT_TYPE

The AMQP 1.0 content-type message property

See Also:

Constant Field Values

ATTRIBUTES_TO_PROPERTYNAMES

public static final Map<String,String> ATTRIBUTES_TO_PROPERTYNAMES

Map a cloud event attribute name to a value. All values except the datacontenttype attribute are prefixed with "cloudEvents:" as mandated by the spec.

APP_PROPERTY_SPEC_VERSION

public static final String APP_PROPERTY_SPEC_VERSION

Method Detail

getApplicationProperty

public static <T> T getApplicationProperty(ApplicationProperties props,
                                           String name,
                                           Class<T> type)

Gets the value of a specific application property.

Type Parameters:

T - The expected type of the property to retrieve.

Parameters:

props - The application properties to retrieve the value from.

name - The name of the application property.

type - The expected value type.

Returns:

The value or null if the properties do not contain a value of the expected type for the given name.

getPayloadAsByteArray

public static byte[] getPayloadAsByteArray(Section payload)

Parses a message payload into a byte array.

The bytes in the array are determined as follows:

• If the body is a Data section, the bytes contained in the Data section are returned.
• If the body is an AmqpValue section and contains a byte array, the bytes in the array are returned.
• If the body is an AmqpValue section and contains a non-empty String, the UTF-8 encoding of the String is returned.
• In all other cases, null is returned.

Parameters:

payload - The message payload to extract the bytes from.

Returns:

The payload bytes or null if the above stated conditions are not met.