public Builder setOutputUriPrefixBytes(com.google.protobuf.ByteString value) {
      if (value == null) {
        throw new NullPointerException();
      }
      checkByteStringIsUtf8(value);
      outputUriPrefix_ = value;
      bitField0_ |= 0x00000001;
      onChanged();
      return this;
    }
<pre>
Required. There must be no files under 'output_uri_prefix'.
'output_uri_prefix' must end with "/" and start with "gs://", otherwise an
INVALID_ARGUMENT (400) error is returned.
</pre>

<code>string output_uri_prefix = 1 [(.google.api.field_behavior) = REQUIRED];</code>

@param value The bytes for outputUriPrefix to set.
@return This builder for chaining.
java-translate/proto-google-cloud-translate-v3beta1/src/main/java/com/google/cloud/translate/v3beta1/GcsDestination.java