public Builder addFiles(int index,
                                    com.alipay.sofa.jraft.entity.LocalStorageOutter.LocalSnapshotPbMeta.File value) {
                if (filesBuilder_ == null) {
                    if (value == null) {
                        throw new NullPointerException();
                    }
                    ensureFilesIsMutable();
                    files_.add(index, value);
                    onChanged();
                } else {
                    filesBuilder_.addMessage(index, value);
                }
                return this;
            }
<code>repeated .jraft.LocalSnapshotPbMeta.File files = 2;</code>
jraft-core/src/main/java/com/alipay/sofa/jraft/entity/LocalStorageOutter.java