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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.core.config.properties;
18  
19  import java.io.IOException;
20  
21  import org.apache.logging.log4j.core.config.Configuration;
22  import org.apache.logging.log4j.core.config.ConfigurationSource;
23  import org.apache.logging.log4j.core.config.Reconfigurable;
24  import org.apache.logging.log4j.core.config.builder.api.Component;
25  import org.apache.logging.log4j.core.config.builder.impl.BuiltConfiguration;
26  
27  /**
28   * Configuration created from a properties file.
29   * @since 2.4
30   */
31  public class PropertiesConfiguration extends BuiltConfiguration implements Reconfigurable {
32  
33      public PropertiesConfiguration(final ConfigurationSource source, final Component root) {
34          super(source, root);
35      }
36  
37      @Override
38      public Configuration reconfigure() {
39          try {
40              final ConfigurationSource source = getConfigurationSource().resetInputStream();
41              if (source == null) {
42                  return null;
43              }
44              final PropertiesConfigurationFactory factory = new PropertiesConfigurationFactory();
45              final PropertiesConfiguration config = factory.getConfiguration(source);
46              return config == null || config.getState() != State.INITIALIZING ? null : config;
47          } catch (final IOException ex) {
48              LOGGER.error("Cannot locate file {}: {}", getConfigurationSource(), ex);
49          }
50          return null;
51      }
52  
53  
54  }