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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.util.Map;
20  
21  /**
22   * PropertySource backed by the current system properties. Other than having a higher priority over normal properties,
23   * this follows the same rules as {@link PropertiesPropertySource}.
24   *
25   * @since 2.10.0
26   */
27  public class SystemPropertiesPropertySource implements PropertySource {
28  
29      private static final String PREFIX = "log4j2.";
30  
31      @Override
32      public int getPriority() {
33          return 100;
34      }
35  
36      @Override
37      public void forEach(final BiConsumer<String, String> action) {
38          for (final Map.Entry<Object, Object> entry : System.getProperties().entrySet()) {
39              action.accept(((String) entry.getKey()), ((String) entry.getValue()));
40          }
41      }
42  
43      @Override
44      public CharSequence getNormalForm(final Iterable<? extends CharSequence> tokens) {
45          return PREFIX + Util.joinAsCamelCase(tokens);
46      }
47  
48  }