@java.lang.Override
  public boolean hasInput() {
    return ((bitField0_ & 0x00000001) != 0);
  }
<pre>
Required. The Synthesizer requires either plain text or SSML as input.
</pre>

<code>
.google.cloud.texttospeech.v1beta1.SynthesisInput input = 1 [(.google.api.field_behavior) = REQUIRED];
</code>

@return Whether the input field is set.
java-texttospeech/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/SynthesizeSpeechRequest.java