Package com.fasterxml.jackson.jakarta.rs.cbor

Class JacksonCBORProvider

  • All Implemented Interfaces:
    com.fasterxml.jackson.core.Versioned, jakarta.ws.rs.ext.MessageBodyReader<Object>, jakarta.ws.rs.ext.MessageBodyWriter<Object>
    Direct Known Subclasses:
    JacksonXmlBindCBORProvider
    @Provider
@Consumes("*/*")
@Produces("*/*")
public class JacksonCBORProvider
extends ProviderBase<JacksonCBORProvider,​com.fasterxml.jackson.databind.ObjectMapper,​CBOREndpointConfig,​CBORMapperConfigurator>
    Basic implementation of Jakarta-RS abstractions (MessageBodyReader, MessageBodyWriter) needed for binding CBOR ("application/cbor") content to and from Java Objects ("POJO"s).

    Actual data binding functionality is implemented by ObjectMapper: mapper to use can be configured in multiple ways:

    • By explicitly passing mapper to use in constructor
    • By explicitly setting mapper to use by ProviderBase.setMapper(MAPPER)
    • By defining Jakarta-RS Provider that returns ObjectMappers.
    • By doing none of above, in which case a default mapper instance is constructed (and configured if configuration methods are called)
    The last method ("do nothing specific") is often good enough; explicit passing of Mapper is simple and explicit; and Provider-based method may make sense with Dependency Injection frameworks, or if Mapper has to be configured differently for different media types.

    Note that the default mapper instance will be automatically created if one of explicit configuration methods (like ProviderBase.configure(com.fasterxml.jackson.jakarta.rs.cfg.JakartaRSFeature, boolean)) is called: if so, Provider-based introspection is NOT used, but the resulting Mapper is used as configured.

    Note that there is also a sub-class -- (JacksonXmlBindCBORProvider) -- that is configured by default to use both Jackson and Jakarta XmlBind annotations for configuration (base class when used as-is defaults to using just Jackson annotations)

    Author:
    Tatu Saloranta

    • Field Detail

      • BASIC_ANNOTATIONS

        public static final Annotations[] BASIC_ANNOTATIONS
        Default annotation sets to use, if not explicitly defined during construction: only Jackson annotations are used for the base class. Sub-classes can use other settings.

      • _providers

        @Context
protected jakarta.ws.rs.ext.Providers _providers
        Injectable context object used to locate configured instance of ObjectMapper to use for actual serialization.

    • Constructor Detail

      • JacksonCBORProvider

        public JacksonCBORProvider()
        Default constructor, usually used when provider is automatically configured to be used with Jakarta-RS implementation.

      • JacksonCBORProvider

        public JacksonCBORProvider​(Annotations... annotationsToUse)
        Parameters:
        annotationsToUse - Annotation set(s) to use for configuring data binding

      • JacksonCBORProvider

        public JacksonCBORProvider​(com.fasterxml.jackson.databind.ObjectMapper mapper)

      • JacksonCBORProvider

        public JacksonCBORProvider​(com.fasterxml.jackson.databind.ObjectMapper mapper,
                           Annotations[] annotationsToUse)
        Constructor to use when a custom mapper (usually components like serializer/deserializer factories that have been configured) is to be used.
        Parameters:
        annotationsToUse - Sets of annotations (Jackson, XmlBind) that provider should support

    • Method Detail

      • version

        public com.fasterxml.jackson.core.Version version()
        Method that will return version information stored in and read from jar that contains this class.

      • hasMatchingMediaType

        protected boolean hasMatchingMediaType​(jakarta.ws.rs.core.MediaType mediaType)
        Helper method used to check whether given media type is CBOR type or sub type. Current implementation essentially checks to see whether MediaType.getSubtype() returns "cbor" or something ending with "+cbor".
        Specified by:
        hasMatchingMediaType in class ProviderBase<JacksonCBORProvider,​com.fasterxml.jackson.databind.ObjectMapper,​CBOREndpointConfig,​CBORMapperConfigurator>

      • _locateMapperViaProvider

        protected com.fasterxml.jackson.databind.ObjectMapper _locateMapperViaProvider​(Class<?> type,
                                                                               jakarta.ws.rs.core.MediaType mediaType)
        Method called to locate ObjectMapper to use for serialization and deserialization. If an instance has been explicitly defined by ProviderBase.setMapper(MAPPER) (or non-null instance passed in constructor), that will be used. If not, will try to locate it using standard Jakarta-RS ContextResolver mechanism, if it has been properly configured to access it (by Jakarta-RS runtime). Finally, if no mapper is found, will return a default unconfigured ObjectMapper instance (one constructed with default constructor and not modified in any way)
        Specified by:
        _locateMapperViaProvider in class ProviderBase<JacksonCBORProvider,​com.fasterxml.jackson.databind.ObjectMapper,​CBOREndpointConfig,​CBORMapperConfigurator>
        Parameters:
        type - Class of object being serialized or deserialized; not checked at this point, since it is assumed that unprocessable classes have been already weeded out, but will be passed to ContextResolver as is.
        mediaType - Declared media type for the instance to process: not used by this method, but will be passed to ContextResolver as is.