public Builder addFiles(com.google.cloud.telcoautomation.v1.File value) {
      if (filesBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        ensureFilesIsMutable();
        files_.add(value);
        onChanged();
      } else {
        filesBuilder_.addMessage(value);
      }
      return this;
    }
<pre>
Optional. Files present in a blueprint.
When invoking UpdateBlueprint API, only the modified files should be
included in this. Files that are not included in the update of a blueprint
will not be changed.
</pre>

<code>
repeated .google.cloud.telcoautomation.v1.File files = 9 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-telcoautomation/proto-google-cloud-telcoautomation-v1/src/main/java/com/google/cloud/telcoautomation/v1/Blueprint.java