public Builder clearGcePd() {
        if (gcePdBuilder_ == null) {
          if (directoryTypeCase_ == 3) {
            directoryTypeCase_ = 0;
            directoryType_ = null;
            onChanged();
          }
        } else {
          if (directoryTypeCase_ == 3) {
            directoryTypeCase_ = 0;
            directoryType_ = null;
          }
          gcePdBuilder_.clear();
        }
        return this;
      }
<pre>
An EphemeralDirectory backed by a Compute Engine persistent disk.
</pre>

<code>
.google.cloud.workstations.v1beta.WorkstationConfig.EphemeralDirectory.GcePersistentDisk gce_pd = 3;
</code>
java-workstations/proto-google-cloud-workstations-v1beta/src/main/java/com/google/cloud/workstations/v1beta/WorkstationConfig.java