private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vmmigration.v1.AwsVmsDetails,
            com.google.cloud.vmmigration.v1.AwsVmsDetails.Builder,
            com.google.cloud.vmmigration.v1.AwsVmsDetailsOrBuilder>
        getAwsVmsFieldBuilder() {
      if (awsVmsBuilder_ == null) {
        if (!(sourceVmsCase_ == 3)) {
          sourceVms_ = com.google.cloud.vmmigration.v1.AwsVmsDetails.getDefaultInstance();
        }
        awsVmsBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vmmigration.v1.AwsVmsDetails,
                com.google.cloud.vmmigration.v1.AwsVmsDetails.Builder,
                com.google.cloud.vmmigration.v1.AwsVmsDetailsOrBuilder>(
                (com.google.cloud.vmmigration.v1.AwsVmsDetails) sourceVms_,
                getParentForChildren(),
                isClean());
        sourceVms_ = null;
      }
      sourceVmsCase_ = 3;
      onChanged();
      return awsVmsBuilder_;
    }
<pre>
The description of the VMs in a Source of type AWS.
</pre>

<code>.google.cloud.vmmigration.v1.AwsVmsDetails aws_vms = 3;</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/FetchInventoryResponse.java