@java.lang.Override
  public com.google.protobuf.ByteString getFilterBytes() {
    java.lang.Object ref = filter_;
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b =
          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
      filter_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }
<pre>
Optional. Filtering only supports equality on deployment state.
It should be in the form: "state = DRAFT". `OR` operator can be used to
get response for multiple states. e.g. "state = DRAFT OR state = APPLIED".
</pre>

<code>string filter = 4 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The bytes for filter.
java-telcoautomation/proto-google-cloud-telcoautomation-v1/src/main/java/com/google/cloud/telcoautomation/v1/ListDeploymentsRequest.java