content: /*
   * Copyright 2013 Proofpoint, Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package io.airlift.http.client;
  
  import com.google.common.collect.ImmutableSet;
  import com.google.common.net.MediaType;
  import com.google.common.primitives.Ints;
  import io.airlift.json.JsonCodec;
  
  import java.io.InputStream;
  import java.util.Set;
  
  import static com.google.common.net.HttpHeaders.CONTENT_TYPE;
  
  public class DefaultingJsonResponseHandler<T>
          implements ResponseHandler<T, RuntimeException>
  {
      private static final MediaType MEDIA_TYPE_JSON = MediaType.create("application", "json");
  
      public static <T> DefaultingJsonResponseHandler<T> createDefaultingJsonResponseHandler(JsonCodec<T> jsonCodec, T defaultValue)
      {
          return new DefaultingJsonResponseHandler<>(jsonCodec, defaultValue);
      }
  
      public static <T> DefaultingJsonResponseHandler<T> createDefaultingJsonResponseHandler(JsonCodec<T> jsonCodec, T defaultValue, int firstSuccessfulResponseCode, int... otherSuccessfulResponseCodes)
      {
          return new DefaultingJsonResponseHandler<>(jsonCodec, defaultValue, firstSuccessfulResponseCode, otherSuccessfulResponseCodes);
      }
  
      private final JsonCodec<T> jsonCodec;
      private final T defaultValue;
      private final Set<Integer> successfulResponseCodes;
  
      private DefaultingJsonResponseHandler(JsonCodec<T> jsonCodec, T defaultValue)
      {
          this(jsonCodec, defaultValue, 200, 201, 202, 203, 204, 205, 206);
      }
  
      private DefaultingJsonResponseHandler(JsonCodec<T> jsonCodec, T defaultValue, int firstSuccessfulResponseCode, int... otherSuccessfulResponseCodes)
      {
          this.jsonCodec = jsonCodec;
          this.defaultValue = defaultValue;
          this.successfulResponseCodes = ImmutableSet.<Integer>builder().add(firstSuccessfulResponseCode).addAll(Ints.asList(otherSuccessfulResponseCodes)).build();
      }
  
      @Override
      public T handleException(Request request, Exception exception)
      {
          return defaultValue;
      }
  
      @Override
      public T handle(Request request, Response response)
      {
          if (!successfulResponseCodes.contains(response.getStatusCode())) {
              return defaultValue;
          }
          String contentType = response.getHeader(CONTENT_TYPE);
          if (contentType != null && !MediaType.parse(contentType).is(MEDIA_TYPE_JSON)) {
              return defaultValue;
          }
          try (InputStream inputStream = response.getInputStream()) {
              return jsonCodec.fromJson(inputStream);
          }
          catch (Exception e) {
              return defaultValue;
          }
      }
  }
  