001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache license, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the license for the specific language governing permissions and
015 * limitations under the license.
016 */
017package org.apache.logging.log4j.util;
018
019import java.util.Map;
020import java.util.Properties;
021
022/**
023 * PropertySource backed by a {@link Properties} instance. Normalized property names follow a scheme like this:
024 * {@code Log4jContextSelector} would normalize to {@code log4j2.contextSelector}.
025 *
026 * @since 2.10.0
027 */
028public class PropertiesPropertySource implements PropertySource {
029
030    private static final String PREFIX = "log4j2.";
031
032    private final Properties properties;
033
034    public PropertiesPropertySource(final Properties properties) {
035        this.properties = properties;
036    }
037
038    @Override
039    public int getPriority() {
040        return 0;
041    }
042
043    @Override
044    public void forEach(final BiConsumer<String, String> action) {
045        for (final Map.Entry<Object, Object> entry : properties.entrySet()) {
046            action.accept(((String) entry.getKey()), ((String) entry.getValue()));
047        }
048    }
049
050    @Override
051    public CharSequence getNormalForm(final Iterable<? extends CharSequence> tokens) {
052        return PREFIX + Util.joinAsCamelCase(tokens);
053    }
054}