alef 0.76.0

Opinionated polyglot binding generator for Rust libraries
Documentation 
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/** Custom deserializer for sealed interface with unwrapped variants. */
class {{ class_name }}Deserializer extends StdDeserializer<{{ class_name }}> {
  private static final long serialVersionUID = 1L;

  {{ class_name }}Deserializer() {
    super({{ class_name }}.class);
  }

{% if is_adjacent and needs_content %}
  /** Rejects an adjacently tagged document whose "{{ content_field }}" payload is absent. */
  private static com.fasterxml.jackson.databind.JsonNode requireContent(
      final JsonParser parser,
      final com.fasterxml.jackson.databind.JsonNode contentNode,
      final String tagValue)
      throws java.io.IOException {
    if (contentNode == null || contentNode.isNull()) {
      throw new com.fasterxml.jackson.databind.JsonMappingException(
          parser, "Missing '{{ content_field }}' payload for {{ class_name }} variant: " + tagValue);
    }
    return contentNode;
  }

{% endif %}
  @Override
  @SuppressWarnings("PMD.CyclomaticComplexity")
  public {{ class_name }} deserialize(final JsonParser parser, final DeserializationContext ctx)
      throws java.io.IOException {
    final ObjectNode node = parser.getCodec().readTree(parser);
    final com.fasterxml.jackson.databind.JsonNode tagNode = node.get("{{ tag_field }}");
    if (tagNode == null || tagNode.isNull()) {
      throw new com.fasterxml.jackson.databind.JsonMappingException(
          parser, "Missing discriminator field: {{ tag_field }}");
    }
    final String tagValue = tagNode.asText();
{% if is_adjacent %}
    final com.fasterxml.jackson.databind.JsonNode contentNode = node.get("{{ content_field }}");
{% else %}
    node.remove("{{ tag_field }}");
{% endif %}

    return switch (tagValue) {
{% for variant in variants %}
{% if variant.is_unit %}
      case "{{ variant.discriminator }}" -> new {{ class_name }}.{{ variant.name }}();
{% elif is_adjacent %}
{% if variant.is_tuple %}
      case "{{ variant.discriminator }}" -> new {{ class_name }}.{{ variant.name }}(
          ctx.readTreeAsValue(requireContent(parser, contentNode, tagValue), {{ variant.inner_type }}.class));
{% else %}
      case "{{ variant.discriminator }}" -> ctx.readTreeAsValue(
          requireContent(parser, contentNode, tagValue), {{ class_name }}.{{ variant.name }}.class);
{% endif %}
{% elif variant.is_tuple %}
{% if variant.inner_type == "String" %}
      case "{{ variant.discriminator }}" -> new {{ class_name }}.{{ variant.name }}(node.toString());
{% else %}
      case "{{ variant.discriminator }}" -> new {{ class_name }}.{{ variant.name }}(ctx.readTreeAsValue(node, {{ variant.inner_type }}.class));
{% endif %}
{% else %}
      case "{{ variant.discriminator }}" -> ctx.readTreeAsValue(node, {{ class_name }}.{{ variant.name }}.class);
{% endif %}
{% endfor %}
      default -> {
{% if excluded_variants %}
        if ({% for discriminator in excluded_variants %}{% if not loop.first %} || {% endif %}tagValue.equals("{{ discriminator }}"){% endfor %}) {
          throw new com.fasterxml.jackson.databind.JsonMappingException(
              parser, "{{ class_name }} variant '" + tagValue + "' is not available in this binding");
        }
{% endif %}
        throw new com.fasterxml.jackson.databind.JsonMappingException(
            parser, "Unknown {{ class_name }} discriminator: " + tagValue);
      }
    };
  }
}