public Builder mergeAwsSourceVmDetails(
        com.google.cloud.vmmigration.v1.AwsSourceVmDetails value) {
      if (awsSourceVmDetailsBuilder_ == null) {
        if (sourceVmDetailsCase_ == 29
            && sourceVmDetails_
                != com.google.cloud.vmmigration.v1.AwsSourceVmDetails.getDefaultInstance()) {
          sourceVmDetails_ =
              com.google.cloud.vmmigration.v1.AwsSourceVmDetails.newBuilder(
                      (com.google.cloud.vmmigration.v1.AwsSourceVmDetails) sourceVmDetails_)
                  .mergeFrom(value)
                  .buildPartial();
        } else {
          sourceVmDetails_ = value;
        }
        onChanged();
      } else {
        if (sourceVmDetailsCase_ == 29) {
          awsSourceVmDetailsBuilder_.mergeFrom(value);
        } else {
          awsSourceVmDetailsBuilder_.setMessage(value);
        }
      }
      sourceVmDetailsCase_ = 29;
      return this;
    }
<pre>
Output only. Details of the VM from an AWS source.
</pre>

<code>
.google.cloud.vmmigration.v1.AwsSourceVmDetails aws_source_vm_details = 29 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/MigratingVm.java