2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2022 Bell Canada. All rights reserved.
4 * ================================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 * SPDX-License-Identifier: Apache-2.0
18 * ============LICENSE_END=========================================================
21 package org.onap.policy.api.main.config;
23 import com.google.gson.Gson;
24 import com.google.gson.GsonBuilder;
25 import com.google.gson.JsonParser;
26 import com.google.gson.JsonSerializer;
27 import java.util.Arrays;
28 import java.util.List;
29 import org.onap.policy.api.main.config.converter.StringToEnumConverter;
30 import org.onap.policy.api.main.config.converter.YamlHttpMessageConverter;
31 import org.springframework.context.annotation.Configuration;
32 import org.springframework.format.FormatterRegistry;
33 import org.springframework.http.MediaType;
34 import org.springframework.http.converter.HttpMessageConverter;
35 import org.springframework.http.converter.json.GsonHttpMessageConverter;
36 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
37 import springfox.documentation.spring.web.json.Json;
40 * Register custom converters to Spring configuration.
43 public class WebConfig implements WebMvcConfigurer {
45 public void addFormatters(FormatterRegistry registry) {
46 registry.addConverter(new StringToEnumConverter());
50 public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
51 YamlHttpMessageConverter yamlConverter = new YamlHttpMessageConverter();
52 yamlConverter.setSupportedMediaTypes(Arrays.asList(MediaType.parseMediaType("application/yaml")));
53 converters.add(yamlConverter);
55 GsonHttpMessageConverter converter = buildGsonConverter();
56 converters.removeIf(c -> c instanceof GsonHttpMessageConverter);
57 converters.add(0, converter);
61 * Swagger uses {{@link springfox.documentation.spring.web.json.Json}} which leads to Gson serialization errors.
62 * Hence, we customize a typeAdapter on the Gson bean in the Gson http message converter.
64 * @return customised GSON HttpMessageConverter instance.
66 private GsonHttpMessageConverter buildGsonConverter() {
67 JsonSerializer<Json> serializer = (json, type, jsonSerializationContext) ->
68 JsonParser.parseString(json.value());
69 Gson gson = new GsonBuilder().registerTypeAdapter(Json.class, serializer).create();
70 return new GsonHttpMessageConverter(gson);