| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.freemarker.generator.base.file; |
| |
| import org.apache.freemarker.generator.base.util.PropertiesFactory; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Properties; |
| import java.util.function.Supplier; |
| |
| import static java.util.Objects.requireNonNull; |
| |
| /** |
| * Resolve a given properties file from the file system. |
| */ |
| public class PropertiesFileSystemSupplier implements Supplier<Properties> { |
| |
| private final String fileName; |
| |
| public PropertiesFileSystemSupplier(String fileName) { |
| this.fileName = requireNonNull(fileName); |
| } |
| |
| @Override |
| public Properties get() { |
| final File file = new File(fileName); |
| |
| if (!file.exists()) { |
| return null; |
| } |
| |
| try { |
| try (InputStream is = new FileInputStream(file)) { |
| return PropertiesFactory.create(is); |
| } |
| } catch (IOException e) { |
| throw new RuntimeException("Failed to load properties file:" + fileName); |
| } |
| } |
| } |