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Source Code for Apache Log4j API
Apache Log4j API
provides the interface that applications should code to and provides the adapter
components required for implementers to create a logging implementation.
Apache Log4j API is a required module to use Apache Log4j.
Bytecode (Java 8) for Apache Log4j API is provided in a separate JAR file like log4j-api-2.14.1.jar.
Source Code files for Apache Log4j API are provided in both binary packge like apache-log4j-2.14.1-bin.zip and source package like apache-log4j-2.14.1-src.zip. You can download them at Apache Log4j Website.
You can also browse Source Code files for Apache Log4j API 2.14.1 below.
✍: FYIcenter.com
⏎ org/apache/logging/log4j/util/PropertySource.java
/* * 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.io.Serializable; import java.util.ArrayList; import java.util.List; import java.util.Map; import java.util.Objects; import java.util.concurrent.ConcurrentHashMap; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * A source for global configuration properties. * * @since 2.10.0 */ public interface PropertySource { /** * Returns the order in which this PropertySource has priority. A higher value means that the source will be * applied later so as to take precedence over other property sources. * * @return priority value */ int getPriority(); /** * Iterates over all properties and performs an action for each key/value pair. * * @param action action to perform on each key/value pair */ default void forEach(BiConsumer<String, String> action) { } /** * Converts a list of property name tokens into a normal form. For example, a list of tokens such as * "foo", "bar", "baz", might be normalized into the property name "log4j2.fooBarBaz". * * @param tokens list of property name tokens * @return a normalized property name using the given tokens */ default CharSequence getNormalForm(Iterable<? extends CharSequence> tokens) { return null; } /** * For PropertySources that cannot iterate over all the potential properties this provides a direct lookup. * @param key The key to search for. * @return The value or null; * @since 2.13.0 */ default String getProperty(String key) { return null; } /** * For PropertySources that cannot iterate over all the potential properties this provides a direct lookup. * @param key The key to search for. * @return The value or null; * @since 2.13.0 */ default boolean containsProperty(String key) { return false; } /** * Comparator for ordering PropertySource instances by priority. * * @since 2.10.0 */ class Comparator implements java.util.Comparator<PropertySource>, Serializable { private static final long serialVersionUID = 1L; @Override public int compare(final PropertySource o1, final PropertySource o2) { return Integer.compare(Objects.requireNonNull(o1).getPriority(), Objects.requireNonNull(o2).getPriority()); } } /** * Utility methods useful for PropertySource implementations. * * @since 2.10.0 */ final class Util { private static final String PREFIXES = "(?i:^log4j2?[-._/]?|^org\\.apache\\.logging\\.log4j\\.)?"; private static final Pattern PROPERTY_TOKENIZER = Pattern.compile(PREFIXES + "([A-Z]*[a-z0-9]+|[A-Z0-9]+)[-._/]?"); private static final Map<CharSequence, List<CharSequence>> CACHE = new ConcurrentHashMap<>(); /** * Converts a property name string into a list of tokens. This will strip a prefix of {@code log4j}, * {@code log4j2}, {@code Log4j}, or {@code org.apache.logging.log4j}, along with separators of * dash {@code -}, dot {@code .}, underscore {@code _}, and slash {@code /}. Tokens can also be separated * by camel case conventions without needing a separator character in between. * * @param value property name * @return the property broken into lower case tokens */ public static List<CharSequence> tokenize(final CharSequence value) { if (CACHE.containsKey(value)) { return CACHE.get(value); } final List<CharSequence> tokens = new ArrayList<>(); final Matcher matcher = PROPERTY_TOKENIZER.matcher(value); while (matcher.find()) { tokens.add(matcher.group(1).toLowerCase()); } CACHE.put(value, tokens); return tokens; } /** * Joins a list of strings using camelCaseConventions. * * @param tokens tokens to convert * @return tokensAsCamelCase */ public static CharSequence joinAsCamelCase(final Iterable<? extends CharSequence> tokens) { final StringBuilder sb = new StringBuilder(); boolean first = true; for (final CharSequence token : tokens) { if (first) { sb.append(token); } else { sb.append(Character.toUpperCase(token.charAt(0))); if (token.length() > 1) { sb.append(token.subSequence(1, token.length())); } } first = false; } return sb.toString(); } private Util() { } } }
⏎ org/apache/logging/log4j/util/PropertySource.java
Or download all of them as a single archive file:
File name: log4j-api-2.14.1-sources.jar File size: 264773 bytes Release date: 2021-03-06 Download
⇒ Source Code for Apache Log4j Core Implementation
⇐ Downloading Apache Log4j Binary Package
2015-11-17, 38527👍, 0💬
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