public java.lang.String getCacheControl() {
      java.lang.Object ref = cacheControl_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        cacheControl_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }
<pre>
Optional. Updates objects Cache-Control fixed metadata. Unset values will
be
 ignored. Set empty values to clear the metadata.
 Additionally, the value for Custom-Time cannot decrease. Refer to
 documentation in
https://cloud.google.com/storage/docs/metadata#caching_data.
</pre>

<code>optional string cache_control = 5 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The cacheControl.
java-storagebatchoperations/proto-google-cloud-storagebatchoperations-v1/src/main/java/com/google/cloud/storagebatchoperations/v1/PutMetadata.java