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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements. See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache license, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License. You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the license for the specific language governing permissions and
15   * limitations under the license.
16   */
17  package org.apache.logging.log4j.util;
18  
19  import java.io.IOException;
20  import java.io.InputStream;
21  import java.net.URL;
22  import java.util.Properties;
23  
24  /**
25   * PropertySource backed by a properties file. Follows the same conventions as {@link PropertiesPropertySource}.
26   *
27   * @since 2.10.0
28   */
29  public class PropertyFilePropertySource extends PropertiesPropertySource {
30  
31      public PropertyFilePropertySource(final String fileName) {
32          super(loadPropertiesFile(fileName));
33      }
34  
35      private static Properties loadPropertiesFile(final String fileName) {
36          final Properties props = new Properties();
37          for (final URL url : LoaderUtil.findResources(fileName)) {
38              try (final InputStream in = url.openStream()) {
39                  props.load(in);
40              } catch (IOException e) {
41                  LowLevelLogUtil.logException("Unable to read " + url, e);
42              }
43          }
44          return props;
45      }
46  
47      @Override
48      public int getPriority() {
49          return 0;
50      }
51  
52  }