private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.tpu.v2alpha1.ServiceIdentity,
            com.google.cloud.tpu.v2alpha1.ServiceIdentity.Builder,
            com.google.cloud.tpu.v2alpha1.ServiceIdentityOrBuilder>
        getIdentityFieldBuilder() {
      if (identityBuilder_ == null) {
        identityBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.tpu.v2alpha1.ServiceIdentity,
                com.google.cloud.tpu.v2alpha1.ServiceIdentity.Builder,
                com.google.cloud.tpu.v2alpha1.ServiceIdentityOrBuilder>(
                getIdentity(), getParentForChildren(), isClean());
        identity_ = null;
      }
      return identityBuilder_;
    }
<pre>
ServiceIdentity that was created or retrieved.
</pre>

<code>.google.cloud.tpu.v2alpha1.ServiceIdentity identity = 1;</code>
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/GenerateServiceIdentityResponse.java