public Builder mergeWorkstationCluster(
        com.google.cloud.workstations.v1.WorkstationCluster value) {
      if (workstationClusterBuilder_ == null) {
        if (((bitField0_ & 0x00000004) != 0)
            && workstationCluster_ != null
            && workstationCluster_
                != com.google.cloud.workstations.v1.WorkstationCluster.getDefaultInstance()) {
          getWorkstationClusterBuilder().mergeFrom(value);
        } else {
          workstationCluster_ = value;
        }
      } else {
        workstationClusterBuilder_.mergeFrom(value);
      }
      if (workstationCluster_ != null) {
        bitField0_ |= 0x00000004;
        onChanged();
      }
      return this;
    }
<pre>
Required. Workstation cluster to create.
</pre>

<code>
.google.cloud.workstations.v1.WorkstationCluster workstation_cluster = 3 [(.google.api.field_behavior) = REQUIRED];
</code>
java-workstations/proto-google-cloud-workstations-v1/src/main/java/com/google/cloud/workstations/v1/CreateWorkstationClusterRequest.java