org.apache.logging.log4j.util.EnvironmentPropertySource Maven / Gradle / Ivy
/*
* 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.logging.log4j.util;
import java.util.Map;
/**
* PropertySource implementation that uses environment variables as a source.
* All environment variables must begin with {@code LOG4J_} so as not to
* conflict with other variables. Normalized environment variables follow a
* scheme like this: {@code log4j2.fooBarProperty} would normalize to
* {@code LOG4J_FOO_BAR_PROPERTY}.
*
* @since 2.10.0
*/
public class EnvironmentPropertySource implements PropertySource {
private static final String PREFIX = "LOG4J_";
private static final int DEFAULT_PRIORITY = -100;
@Override
public int getPriority() {
return DEFAULT_PRIORITY;
}
@Override
public void forEach(final BiConsumer action) {
final Map getenv;
try {
getenv = System.getenv();
} catch (final SecurityException e) {
// There is no status logger yet.
LowLevelLogUtil.logException(
"The system environment variables are not available to Log4j due to security restrictions: " + e,
e);
return;
}
for (final Map.Entry entry : getenv.entrySet()) {
final String key = entry.getKey();
if (key.startsWith(PREFIX)) {
action.accept(key.substring(PREFIX.length()), entry.getValue());
}
}
}
@Override
public CharSequence getNormalForm(final Iterable tokens) {
final StringBuilder sb = new StringBuilder("LOG4J");
for (final CharSequence token : tokens) {
sb.append('_');
for (int i = 0; i < token.length(); i++) {
sb.append(Character.toUpperCase(token.charAt(i)));
}
}
return sb.toString();
}
}