public Builder mergeAdaptingOs(com.google.cloud.vmmigration.v1.AdaptingOSStep value) {
      if (adaptingOsBuilder_ == null) {
        if (stepCase_ == 3
            && step_ != com.google.cloud.vmmigration.v1.AdaptingOSStep.getDefaultInstance()) {
          step_ =
              com.google.cloud.vmmigration.v1.AdaptingOSStep.newBuilder(
                      (com.google.cloud.vmmigration.v1.AdaptingOSStep) step_)
                  .mergeFrom(value)
                  .buildPartial();
        } else {
          step_ = value;
        }
        onChanged();
      } else {
        if (stepCase_ == 3) {
          adaptingOsBuilder_.mergeFrom(value);
        } else {
          adaptingOsBuilder_.setMessage(value);
        }
      }
      stepCase_ = 3;
      return this;
    }
<pre>
Adapting OS step.
</pre>

<code>.google.cloud.vmmigration.v1.AdaptingOSStep adapting_os = 3;</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/CloneStep.java