Package org.springframework.core.codec

Interface Encoder<T>

Type Parameters:
T - the type of elements in the input stream
All Known Subinterfaces:
HttpMessageEncoder<T>
All Known Implementing Classes:
AbstractEncoder, AbstractJackson2Encoder, AbstractSingleValueEncoder, ByteArrayEncoder, ByteBufferEncoder, CharSequenceEncoder, DataBufferEncoder, Jackson2CborEncoder, Jackson2JsonEncoder, Jackson2SmileEncoder, Jaxb2XmlEncoder, KotlinSerializationBinaryEncoder, KotlinSerializationCborEncoder, KotlinSerializationJsonEncoder, KotlinSerializationProtobufEncoder, KotlinSerializationStringEncoder, Netty5BufferEncoder, NettyByteBufEncoder, ProtobufEncoder, ProtobufJsonEncoder, ResourceEncoder, ResourceRegionEncoder
public interface Encoder<T>
Strategy to encode a stream of Objects of type <T> into an output stream of bytes.
Since:
5.0
Author:
Sebastien Deleuze, Rossen Stoyanchev

  • Method Details

    • canEncode

      boolean canEncode(ResolvableType elementType, @Nullable MimeType mimeType)
      Whether the encoder supports the given source element type and the MIME type for the output stream.
      Parameters:
      elementType - the type of elements in the source stream
      mimeType - the MIME type for the output stream (can be null if not specified)
      Returns:
      true if supported, false otherwise

    • encode

      reactor.core.publisher.Flux<DataBuffer> encode(Publisher<? extends T> inputStream, DataBufferFactory bufferFactory, ResolvableType elementType, @Nullable MimeType mimeType, @Nullable Map<String,Object> hints)
      Encode a stream of Objects of type T into a DataBuffer output stream.
      Parameters:
      inputStream - the input stream of Objects to encode. If the input should be encoded as a single value rather than as a stream of elements, an instance of Mono should be used.
      bufferFactory - for creating output stream DataBuffer's
      elementType - the expected type of elements in the input stream; this type must have been previously passed to the canEncode(org.springframework.core.ResolvableType, org.springframework.util.MimeType) method and it must have returned true.
      mimeType - the MIME type for the output content (optional)
      hints - additional information about how to encode
      Returns:
      the output stream

    • encodeValue

      default DataBuffer encodeValue(T value, DataBufferFactory bufferFactory, ResolvableType valueType, @Nullable MimeType mimeType, @Nullable Map<String,Object> hints)
      Encode an Object of type T to a data buffer. This is useful for scenarios, that distinct messages (or events) are encoded and handled individually, in fully aggregated form.

      By default this method raises UnsupportedOperationException and it is expected that some encoders cannot produce a single buffer or cannot do so synchronously (for example, encoding a Resource).

      Parameters:
      value - the value to be encoded
      bufferFactory - for creating the output DataBuffer
      valueType - the type for the value being encoded
      mimeType - the MIME type for the output content (optional)
      hints - additional information about how to encode
      Returns:
      the encoded content
      Since:
      5.2

    • getEncodableMimeTypes

      List<MimeType> getEncodableMimeTypes()
      Return the list of MIME types supported by this Encoder. The list may not apply to every possible target element type and calls to this method should typically be guarded via canEncode(elementType, null). The list may also exclude MIME types supported only for a specific element type. Alternatively, use getEncodableMimeTypes(ResolvableType) for a more precise list.
      Returns:
      the list of supported MIME types

    • getEncodableMimeTypes

      default List<MimeType> getEncodableMimeTypes(ResolvableType elementType)
      Return the list of MIME types supported by this Encoder for the given type of element. This list may differ from the getEncodableMimeTypes() if the Encoder doesn't support the element type or if it supports it only for a subset of MIME types.
      Parameters:
      elementType - the type of element to check for encoding
      Returns:
      the list of MIME types supported for the given element type
      Since:
      5.3.4