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dart2 generator from openapi 3.x spec files. Changing to openapitools dependencies.
There is a newer version: 4.7
part of {{pubName}}.api;

{{#operations}}


class {{classname}} {
  final ApiClient apiClient;

  {{classname}}([ApiClient apiClient]) : apiClient = apiClient ?? defaultApiClient;

  {{#operation}}
  /// {{summary}}
  ///
  /// {{notes}}
  {{#returnType}}Future<{{{returnType}}}> {{/returnType}}{{^returnType}}Future {{/returnType}}{{nickname}}({{#allParams}}{{#required}}{{{dataType}}} {{paramName}}{{#hasMore}}, {{/hasMore}}{{/required}}{{/allParams}}{{#hasOptionalParams}}{ {{#allParams}}{{^required}}{{{dataType}}} {{paramName}}{{#hasMore}}, {{/hasMore}}{{/required}}{{/allParams}} }{{/hasOptionalParams}}) async {
    Object postBody{{#bodyParam}} = {{paramName}}{{/bodyParam}};

    // verify required params are set
    {{#allParams}}
      {{#required}}
    if({{paramName}} == null) {
     throw new ApiException(400, "Missing required param: {{paramName}}");
    }
      {{/required}}
    {{/allParams}}

    // create path and map variables
    String path = "{{{path}}}".replaceAll("{format}","json"){{#pathParams}}.replaceAll("{" + "{{baseName}}" + "}", {{{paramName}}}.toString()){{/pathParams}};

    // query params
    List queryParams = [];
    Map headerParams = {};
    Map formParams = {};
    {{#queryParams}}
    {{^required}}
    if({{paramName}} != null) {
    {{/required}}
      queryParams.addAll(_convertParametersForCollectionFormat("{{collectionFormat}}", "{{baseName}}", {{paramName}}));
    {{^required}}
    }
    {{/required}}
    {{/queryParams}}
    {{#headerParams}}
    headerParams["{{baseName}}"] = {{paramName}};
    {{/headerParams}}

    List contentTypes = [{{#consumes}}"{{{mediaType}}}"{{#hasMore}},{{/hasMore}}{{/consumes}}];

    String contentType = contentTypes.isNotEmpty ? contentTypes[0] : "application/json";
    List authNames = [{{#authMethods}}"{{name}}"{{#hasMore}}, {{/hasMore}}{{/authMethods}}];

    if(contentType.startsWith("multipart/form-data")) {
      bool hasFields = false;
      MultipartRequest mp = new MultipartRequest(null, null);
      {{#formParams}}
      {{^isFile}}
      if ({{paramName}} != null) {
        hasFields = true;
        mp.fields['{{baseName}}'] = parameterToString({{paramName}});
      }
      {{/isFile}}
      {{#isFile}}
      if ({{paramName}} != null) {
        hasFields = true;
        mp.fields['{{baseName}}'] = {{paramName}}.field;
        mp.files.add({{paramName}});
      }
      {{/isFile}}
      {{/formParams}}
      if(hasFields)
        postBody = mp;
    }
    else {
      {{#formParams}}
      {{^isFile}}
      if ({{paramName}} != null)
        formParams['{{baseName}}'] = parameterToString({{paramName}});
      {{/isFile}}
      {{/formParams}}
    }

    var response = await apiClient.invokeAPI(path,
                                             '{{httpMethod}}',
                                             queryParams,
                                             postBody,
                                             headerParams,
                                             formParams,
                                             contentType,
                                             authNames);

    if(response.statusCode >= 400) {
      throw new ApiException(response.statusCode, _decodeBodyBytes(response));
    } else if(response.body != null) {
      {{#isListContainer}}
        {{#returnType}}
      return (apiClient.deserialize(_decodeBodyBytes(response), '{{{returnType}}}') as List).map((item) => item as {{returnBaseType}}).toList();
        {{/returnType}}
      {{/isListContainer}}
      {{^isListContainer}}
        {{#isMapContainer}}
          {{#returnType}}
      return new {{{returnType}}}.from(apiClient.deserialize(_decodeBodyBytes(response), '{{{returnType}}}'));
          {{/returnType}};
        {{/isMapContainer}}
        {{^isMapContainer}}
          {{#returnType}}
      return apiClient.deserialize(_decodeBodyBytes(response), '{{{returnType}}}') as {{{returnType}}};
          {{/returnType}}
        {{/isMapContainer}}
      {{/isListContainer}}
    } else {
      return{{#returnType}} null{{/returnType}};
    }
  }
  {{/operation}}
}
{{/operations}}