public Builder mergeGceInstance(
          com.google.cloud.workstations.v1beta.WorkstationConfig.Host.GceInstance value) {
        if (gceInstanceBuilder_ == null) {
          if (configCase_ == 1
              && config_
                  != com.google.cloud.workstations.v1beta.WorkstationConfig.Host.GceInstance
                      .getDefaultInstance()) {
            config_ =
                com.google.cloud.workstations.v1beta.WorkstationConfig.Host.GceInstance.newBuilder(
                        (com.google.cloud.workstations.v1beta.WorkstationConfig.Host.GceInstance)
                            config_)
                    .mergeFrom(value)
                    .buildPartial();
          } else {
            config_ = value;
          }
          onChanged();
        } else {
          if (configCase_ == 1) {
            gceInstanceBuilder_.mergeFrom(value);
          } else {
            gceInstanceBuilder_.setMessage(value);
          }
        }
        configCase_ = 1;
        return this;
      }
<pre>
Specifies a Compute Engine instance as the host.
</pre>

<code>
.google.cloud.workstations.v1beta.WorkstationConfig.Host.GceInstance gce_instance = 1;
</code>
java-workstations/proto-google-cloud-workstations-v1beta/src/main/java/com/google/cloud/workstations/v1beta/WorkstationConfig.java