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 }