@java.lang.Override
    public boolean hasValidInterval() {
      return startTimingConstraintsCase_ == 5;
    }
<pre>
Optional. An absolute time interval within which resources may be
created.
</pre>

<code>.google.type.Interval valid_interval = 5 [(.google.api.field_behavior) = OPTIONAL];
</code>

@return Whether the validInterval field is set.
java-tpu/proto-google-cloud-tpu-v2/src/main/java/com/google/cloud/tpu/v2/QueuedResource.java