Package jakarta.ws.rs.core

Class Variant.VariantListBuilder

  • Enclosing class:
    Variant
    public abstract static class Variant.VariantListBuilder
extends Object
    A builder for a list of representation variants.

    • Constructor Detail

      • VariantListBuilder

        protected VariantListBuilder()
        Protected constructor, use the static newInstance method to obtain an instance.

    • Method Detail

      • newInstance

        public static Variant.VariantListBuilder newInstance()
        Create a new builder instance.
        Returns:
        a new builder instance.

      • build

        public abstract List<Variant> build()
        Add the current combination of metadata to the list of supported variants (provided the current combination of metadata is not empty) and build a list of representation variants from the current state of the builder. After this method is called the builder is reset to an empty state.
        Returns:
        a list of representation variants.

      • add

        public abstract Variant.VariantListBuilder add()
        Add the current combination of metadata to the list of supported variants, after this method is called the current combination of metadata is emptied.

        If more than one value is supplied for one or more of the variant properties then a variant will be generated for each possible combination. E.g. in the following list would have five (4 + 1) members: 

         List<Variant> list = VariantListBuilder.newInstance()
         .languages(Locale.ENGLISH, Locale.FRENCH).encodings("zip", "identity").add()
         .languages(Locale.GERMAN).mediaTypes(MediaType.TEXT_PLAIN_TYPE).add()
         .build()

        Note that it is not necessary to call the add() method immediately before the build method is called. E.g. the resulting list produced in the example above would be identical to the list produced by the following code: 

         List<Variant> list = VariantListBuilder.newInstance()
         .languages(Locale.ENGLISH, Locale.FRENCH).encodings("zip", "identity").add()
         .languages(Locale.GERMAN).mediaTypes(MediaType.TEXT_PLAIN_TYPE)
         .build()
        Returns:
        the updated builder.
        Throws:
        IllegalStateException - if there is not at least one mediaType, language or encoding set for the current variant.

      • languages

        public abstract Variant.VariantListBuilder languages​(Locale... languages)
        Set the language(s) for this variant.
        Parameters:
        languages - the available languages.
        Returns:
        the updated builder.

      • encodings

        public abstract Variant.VariantListBuilder encodings​(String... encodings)
        Set the encoding(s) for this variant.
        Parameters:
        encodings - the available encodings.
        Returns:
        the updated builder.

      • mediaTypes

        public abstract Variant.VariantListBuilder mediaTypes​(MediaType... mediaTypes)
        Set the media type(s) for this variant.
        Parameters:
        mediaTypes - the available mediaTypes. If specific charsets are supported they should be included as parameters of the respective media type.
        Returns:
        the updated builder.