public Builder mergeShieldedInstanceConfig(
        com.google.cloud.tpu.v2.ShieldedInstanceConfig value) {
      if (shieldedInstanceConfigBuilder_ == null) {
        if (((bitField0_ & 0x00200000) != 0)
            && shieldedInstanceConfig_ != null
            && shieldedInstanceConfig_
                != com.google.cloud.tpu.v2.ShieldedInstanceConfig.getDefaultInstance()) {
          getShieldedInstanceConfigBuilder().mergeFrom(value);
        } else {
          shieldedInstanceConfig_ = value;
        }
      } else {
        shieldedInstanceConfigBuilder_.mergeFrom(value);
      }
      if (shieldedInstanceConfig_ != null) {
        bitField0_ |= 0x00200000;
        onChanged();
      }
      return this;
    }
<pre>
Shielded Instance options.
</pre>

<code>.google.cloud.tpu.v2.ShieldedInstanceConfig shielded_instance_config = 45;</code>
java-tpu/proto-google-cloud-tpu-v2/src/main/java/com/google/cloud/tpu/v2/Node.java