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 * modification, are permitted provided that the following conditions are
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 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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package com.google.api.gax.grpc;

import com.google.api.client.util.Preconditions;
import com.google.api.gax.rpc.ApiCallContext;
import io.grpc.ClientCall;
import io.grpc.MethodDescriptor;

/**
 * {@code GrpcClientCalls} creates a new {@code ClientCall} from the given call context.
 *
 * <p>Package-private for internal use.
 */
class GrpcClientCalls {

  private GrpcClientCalls() {};

  public static <RequestT, ResponseT> ClientCall newCall(
      MethodDescriptor<RequestT, ResponseT> descriptor, ApiCallContext context) {
    if (!(context instanceof GrpcCallContext)) {
      throw new IllegalArgumentException(
          "context must be an instance of GrpcCallContext, but found "
              + context.getClass().getName());
    }
    GrpcCallContext grpcContext = (GrpcCallContext) context;
    Preconditions.checkNotNull(grpcContext.getChannel());
    Preconditions.checkNotNull(grpcContext.getCallOptions());
    return grpcContext.getChannel().newCall(descriptor, grpcContext.getCallOptions());
  }
}

@@ -1989,16 +1989,37 @@
 ientCall
+%3CRequestT, ResponseT%3E
  newCall

Remove warnings of GrpcClientCalls (#351)