public Builder mergeComputeEngineTargetDefaults(
        com.google.cloud.vmmigration.v1.ComputeEngineTargetDefaults value) {
      if (computeEngineTargetDefaultsBuilder_ == null) {
        if (targetVmDefaultsCase_ == 26
            && targetVmDefaults_
                != com.google.cloud.vmmigration.v1.ComputeEngineTargetDefaults
                    .getDefaultInstance()) {
          targetVmDefaults_ =
              com.google.cloud.vmmigration.v1.ComputeEngineTargetDefaults.newBuilder(
                      (com.google.cloud.vmmigration.v1.ComputeEngineTargetDefaults)
                          targetVmDefaults_)
                  .mergeFrom(value)
                  .buildPartial();
        } else {
          targetVmDefaults_ = value;
        }
        onChanged();
      } else {
        if (targetVmDefaultsCase_ == 26) {
          computeEngineTargetDefaultsBuilder_.mergeFrom(value);
        } else {
          computeEngineTargetDefaultsBuilder_.setMessage(value);
        }
      }
      targetVmDefaultsCase_ = 26;
      return this;
    }
<pre>
Details of the target VM in Compute Engine.
</pre>

<code>
.google.cloud.vmmigration.v1.ComputeEngineTargetDefaults compute_engine_target_defaults = 26;
</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/MigratingVm.java