/*
 * Copyright (C) 2012 Square, Inc.
 * Copyright (C) 2007 The Guava Authors
 *
 * 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 retrofit;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.Executor;
import retrofit.client.Request;
import retrofit.client.Response;
import retrofit.mime.TypedByteArray;
import retrofit.mime.TypedInput;
import retrofit.mime.TypedOutput;

final class Utils {
  private static final int BUFFER_SIZE = 0x1000;

  /**
   * Creates a {@code byte[]} from reading the entirety of an {@link InputStream}. May return an
   * empty array but never {@code null}.
   * <p>
   * Copied from Guava's {@code ByteStreams} class.
   */
  static byte[] streamToBytes(InputStream stream) throws IOException {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    if (stream != null) {
      byte[] buf = new byte[BUFFER_SIZE];
      int r;
      while ((r = stream.read(buf)) != -1) {
        baos.write(buf, 0, r);
      }
    }
    return baos.toByteArray();
  }

  /**
   * Conditionally replace a {@link Request} with an identical copy whose body is backed by a
   * byte[] rather than an input stream.
   */
  static Request readBodyToBytesIfNecessary(Request request) throws IOException {
    TypedOutput body = request.getBody();
    if (body == null || body instanceof TypedByteArray) {
      return request;
    }

    String bodyMime = body.mimeType();
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    body.writeTo(baos);
    body = new TypedByteArray(bodyMime, baos.toByteArray());

    return new Request(request.getMethod(), request.getUrl(), request.getHeaders(), body);
  }

  /**
   * Conditionally replace a {@link Response} with an identical copy whose body is backed by a
   * byte[] rather than an input stream.
   */
  static Response readBodyToBytesIfNecessary(Response response) throws IOException {
    TypedInput body = response.getBody();
    if (body == null || body instanceof TypedByteArray) {
      return response;
    }

    String bodyMime = body.mimeType();
    InputStream is = body.in();
    try {
      byte[] bodyBytes = Utils.streamToBytes(is);
      body = new TypedByteArray(bodyMime, bodyBytes);

      return replaceResponseBody(response, body);
    } finally {
      if (is != null) {
        try {
          is.close();
        } catch (IOException ignored) {
        }
      }
    }
  }

  static Response replaceResponseBody(Response response, TypedInput body) {
    return new Response(response.getStatus(), response.getReason(), response.getHeaders(), body);
  }

  static <T> void validateServiceClass(Class<T> service) {
    if (!service.isInterface()) {
      throw new IllegalArgumentException("Only interface endpoint definitions are supported.");
    }
    // Prevent API interfaces from extending other interfaces. This not only avoids a bug in
    // Android (http://b.android.com/58753) but it forces composition of API declarations which is
    // the recommended pattern.
    if (service.getSuperclass() != null) {
      throw new IllegalArgumentException("Interface definitions must not extend other interfaces.");
    }
  }

  static class SynchronousExecutor implements Executor {
    @Override public void execute(Runnable runnable) {
      runnable.run();
    }
  }

  private Utils() {
    // No instances.
  }
}

@@ -3582,28 +3582,31 @@
 .get
-Superclass() != null
+Interfaces().length %3E 0
 ) %7B%0A

Check for extended interfaces using getInterfaces().length instead of getSuperclass()