| /* |
| * Copyright (C) 2022 The Libphonenumber Authors |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.google.i18n.phonenumbers.metadata.source; |
| |
| /** |
| * Guard that ensures that metadata bootstrapping process (loading and parsing) is triggered only |
| * once per metadata file. |
| * |
| * @param <T> needs to extend {@link MetadataContainer} |
| */ |
| public interface MetadataBootstrappingGuard<T extends MetadataContainer> { |
| |
| /** |
| * If metadata from the provided file has not yet been read, invokes loading and parsing from the |
| * provided file and adds the result to guarded {@link MetadataContainer}. |
| * |
| * @param phoneMetadataFile to read from |
| * @return guarded {@link MetadataContainer} |
| */ |
| T getOrBootstrap(String phoneMetadataFile); |
| } |