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A RxJava 2 CallAdapter.Facotry implementation for Retrofit 2.

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/*
 * Copyright (C) 2015 Square, 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 com.jakewharton.retrofit2.adapter.rxjava2;

import retrofit2.Response;

/** Exception for an unexpected, non-2xx HTTP response. */
public final class HttpException extends Exception {
  private static String getMessage(Response response) {
    if (response == null) throw new NullPointerException("response == null");
    return "HTTP " + response.code() + " " + response.message();
  }

  private final int code;
  private final String message;
  private final transient Response response;

  public HttpException(Response response) {
    super(getMessage(response));
    this.code = response.code();
    this.message = response.message();
    this.response = response;
  }

  /** HTTP status code. */
  public int code() {
    return code;
  }

  /** HTTP status message. */
  public String message() {
    return message;
  }

  /**
   * The full HTTP response. This may be null if the exception was serialized.
   */
  public Response response() {
    return response;
  }
}