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Kora openapi-generator module
There is a newer version: 1.1.16
package {{package}};

import ru.tinkoff.kora.http.server.common.handler.HttpServerResponseEntityMapper;
import ru.tinkoff.kora.http.server.common.handler.HttpServerResponseMapper;
import ru.tinkoff.kora.http.server.common.HttpServerResponse;
import ru.tinkoff.kora.http.server.common.HttpServerRequest;
import ru.tinkoff.kora.http.common.HttpResponseEntity;
import ru.tinkoff.kora.http.common.body.HttpBody;
import ru.tinkoff.kora.http.common.header.HttpHeaders;
import ru.tinkoff.kora.common.Context;


import {{package}}.{{classname}}Responses.*;

{{#imports}}import {{import}};
{{/imports}}

@ru.tinkoff.kora.common.annotation.Generated("openapi generator kora server"){{#discriminator}}{{>typeInfoAnnotation}}{{/discriminator}}
public interface {{classname}}ServerResponseMappers {
{{#operations}}
{{#operation}}
  @ru.tinkoff.kora.common.annotation.Generated("openapi generator kora server")
  final class {{#lambda.titlecase}}{{operationId}}{{/lambda.titlecase}}{{code}}ApiResponseMapper implements HttpServerResponseMapper<{{#lambda.titlecase}}{{operationId}}{{/lambda.titlecase}}ApiResponse>{
    {{#responses}}
    {{#dataType}}
    private final HttpServerResponseMapper> response{{code}}Delegate;
    {{/dataType}}
    {{/responses}}


    public {{#lambda.titlecase}}{{operationId}}{{/lambda.titlecase}}ApiResponseMapper(
      {{#responses}}
      {{#dataType}}
      {{^isBinary}}
      @{{vendorExtensions.jsonTag}}
      {{/isBinary}}
      HttpServerResponseMapper<{{{dataType}}}> response{{code}}Delegate{{#vendorExtensions.hasMore}},{{/vendorExtensions.hasMore}}
      {{/dataType}}
      {{/responses}}) {
      {{#responses}}
      {{#dataType}}
      this.response{{code}}Delegate = new HttpServerResponseEntityMapper<>(response{{code}}Delegate);
      {{/dataType}}
      {{/responses}}
    }

    @Override
    public HttpServerResponse apply(Context ctx, HttpServerRequest request, {{#lambda.titlecase}}{{operationId}}{{/lambda.titlecase}}ApiResponse response) throws java.io.IOException { {{#responses}}{{^vendorExtensions.singleResponse}}
      if (response instanceof {{#lambda.titlecase}}{{operationId}}{{/lambda.titlecase}}ApiResponse.{{#lambda.titlecase}}{{operationId}}{{/lambda.titlecase}}{{#isDefault}}Default{{/isDefault}}{{^isDefault}}{{code}}{{/isDefault}}ApiResponse rs) { {{/vendorExtensions.singleResponse}}{{#vendorExtensions.singleResponse}}
      var rs = response;{{/vendorExtensions.singleResponse}}
        {{#vendorExtensions.isBinaryUnknownType}}
        var headers = HttpHeaders.of("content-type", "{{{vendorExtensions.contentType}}}");
        {{/vendorExtensions.isBinaryUnknownType}}
        {{^vendorExtensions.isBinaryUnknownType}}
        var headers = HttpHeaders.of();
        {{/vendorExtensions.isBinaryUnknownType}}{{#headers}}{{#required}}
        headers.set("{{baseName}}", rs.{{#lambda.camelcase}}{{nameInCamelCase}}{{/lambda.camelcase}}());{{/required}}{{^required}}
        if (rs.{{#lambda.camelcase}}{{nameInCamelCase}}{{/lambda.camelcase}}() != null) {
          headers.set("{{baseName}}", rs.{{#lambda.camelcase}}{{nameInCamelCase}}{{/lambda.camelcase}}());
        }{{/required}}{{/headers}}
        {{#isBinary}}{{#vendorExtensions.isBinaryUnknownType}}
        var entity = HttpResponseEntity.of({{#isDefault}}rs.statusCode(){{/isDefault}}{{^isDefault}}{{code}}{{/isDefault}}, headers, rs.content());
        return this.response{{code}}Delegate.apply(ctx, request, entity);
        {{/vendorExtensions.isBinaryUnknownType}}{{^vendorExtensions.isBinaryUnknownType}}
        return HttpServerResponse.of({{#isDefault}}rs.statusCode(){{/isDefault}}{{^isDefault}}{{code}}{{/isDefault}}, headers, HttpBody.of(ctx, "{{{vendorExtensions.contentType}}}", rs.content()));
        {{/vendorExtensions.isBinaryUnknownType}}{{/isBinary}}
        {{^isBinary}}{{^dataType}}
        return HttpServerResponse.of({{#isDefault}}rs.statusCode(){{/isDefault}}{{^isDefault}}{{code}}{{/isDefault}}, headers);{{/dataType}}{{#dataType}}
        var entity = HttpResponseEntity.of({{#isDefault}}rs.statusCode(){{/isDefault}}{{^isDefault}}{{code}}{{/isDefault}}, headers, rs.content());
        return this.response{{code}}Delegate.apply(ctx, request, entity);{{/dataType}}{{/isBinary}}{{^vendorExtensions.singleResponse}}
      }{{/vendorExtensions.singleResponse}}{{/responses}}
      {{^vendorExtensions.singleResponse}}
      throw new IllegalStateException();
      {{/vendorExtensions.singleResponse}}
    }
  }

{{/operation}}
{{/operations}}
}