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android logger simple implementation
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‎.gitignore‎

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@@ -9,3 +9,5 @@ buildNumber.properties
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.mvn/timing.properties
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# https://github.com/takari/maven-wrapper#usage-without-binary-jar
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.mvn/wrapper/maven-wrapper.jar
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.idea/
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log4j2-android.iml

‎pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>com.celeral</groupId>
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<version>2.1.3</version>
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<artifactId>parent</artifactId>
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</parent>
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<groupId>com.celeral</groupId>
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<artifactId>log4j2-android</artifactId>
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<version>1.0.0</version>
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<name>log4j2-android</name>
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<properties>
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<revision>1.0.0</revision>
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<revision.base>NULL</revision.base>
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</properties>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-jar-plugin</artifactId>
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<version>3.2.0</version>
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<configuration>
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<excludes>
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<exclude>android/**</exclude>
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</excludes>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<profiles>
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<profile>
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<id>release</id>
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<build>
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<plugins>
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<plugin>
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<groupId>org.codehaus.mojo</groupId>
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<artifactId>flatten-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</profile>
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</profiles>
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<dependencies>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-api</artifactId>
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</dependency>
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</dependencies>
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</project>

‎src/main/java/android/util/Log.java‎

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package android.util;
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public class Log
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{
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static final UnsupportedOperationException exception = new UnsupportedOperationException("This is a stub; Actual Implementation will be auto invoked on Android platform!");
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public static int v(String tag, String formattedMessage, Throwable throwable)
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{
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throw exception;
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}
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public static int d(String tag, String formattedMessage, Throwable throwable)
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{
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throw exception;
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}
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public static int i(String tag, String formattedMessage, Throwable throwable)
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{
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throw exception;
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}
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public static int w(String tag, String formattedMessage, Throwable throwable)
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{
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throw exception;
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}
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public static int e(String tag, String formattedMessage, Throwable throwable)
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{
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throw exception;
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}
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public static int wtf(String tag, String formattedMessage, Throwable throwable)
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{
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throw exception;
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}
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}

‎src/main/java/com/celeral/android/logging/log4j/AndroidLogger.java‎

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/* Copyright © 2020 Celeral. */
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package com.celeral.android.logging.log4j;
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import android.util.Log;
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import org.apache.logging.log4j.Level;
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import org.apache.logging.log4j.Marker;
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import org.apache.logging.log4j.message.Message;
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import org.apache.logging.log4j.message.MessageFactory;
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import org.apache.logging.log4j.simple.SimpleLogger;
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import org.apache.logging.log4j.util.PropertiesUtil;
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public class AndroidLogger extends SimpleLogger {
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final String tag;
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public AndroidLogger(String name, Level defaultLevel, MessageFactory messageFactory) {
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super(
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name,
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defaultLevel,
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false,
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false,
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false,
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false,
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null,
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messageFactory,
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PropertiesUtil.getProperties(),
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null);
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if (name == null) {
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tag = null;
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} else {
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int lastIndex = name.lastIndexOf('.');
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tag = lastIndex == -1 ? name : name.substring(lastIndex + 1);
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}
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}
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@Override
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public void logMessage(
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String fqcn, Level mgsLevel, Marker marker, Message msg, Throwable throwable) {
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switch (mgsLevel.getStandardLevel()) {
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case ALL:
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case TRACE:
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Log.v(tag, msg.getFormattedMessage(), throwable);
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break;
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case DEBUG:
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Log.d(tag, msg.getFormattedMessage(), throwable);
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break;
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case INFO:
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Log.i(tag, msg.getFormattedMessage(), throwable);
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break;
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case WARN:
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Log.w(tag, msg.getFormattedMessage(), throwable);
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break;
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case ERROR:
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Log.e(tag, msg.getFormattedMessage(), throwable);
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break;
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case FATAL:
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Log.wtf(tag, msg.getFormattedMessage(), throwable);
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break;
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case OFF:
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default:
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break;
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}
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}
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}

‎src/main/java/com/celeral/android/logging/log4j/AndroidLoggerContext.java‎

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/* Copyright © 2020 Celeral. */
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package com.celeral.android.logging.log4j;
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import org.apache.logging.log4j.Level;
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import org.apache.logging.log4j.message.MessageFactory;
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import org.apache.logging.log4j.spi.AbstractLogger;
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import org.apache.logging.log4j.spi.ExtendedLogger;
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import org.apache.logging.log4j.spi.LoggerContext;
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import org.apache.logging.log4j.spi.LoggerRegistry;
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public class AndroidLoggerContext implements LoggerContext {
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private final LoggerRegistry<ExtendedLogger> loggerRegistry = new LoggerRegistry<>();
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@Override
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public Object getExternalContext() {
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return null;
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}
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@Override
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public ExtendedLogger getLogger(String name) {
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return getLogger(name, null);
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}
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@Override
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public ExtendedLogger getLogger(String name, MessageFactory messageFactory) {
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final ExtendedLogger extendedLogger = loggerRegistry.getLogger(name, messageFactory);
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if (extendedLogger != null) {
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AbstractLogger.checkMessageFactory(extendedLogger, messageFactory);
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return extendedLogger;
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}
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final AndroidLogger logger = new AndroidLogger(name, Level.ALL, messageFactory);
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loggerRegistry.putIfAbsent(name, messageFactory, logger);
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return loggerRegistry.getLogger(name, messageFactory);
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}
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@Override
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public boolean hasLogger(String name) {
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return false;
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}
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@Override
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public boolean hasLogger(String name, MessageFactory messageFactory) {
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return false;
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}
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@Override
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public boolean hasLogger(String name, Class<? extends MessageFactory> messageFactoryClass) {
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return false;
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}
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}

‎src/main/java/com/celeral/android/logging/log4j/AndroidLoggerContextFactory.java‎

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/* Copyright © 2020 Celeral. */
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package com.celeral.android.logging.log4j;
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import java.net.URI;
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import org.apache.logging.log4j.spi.LoggerContext;
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import org.apache.logging.log4j.spi.LoggerContextFactory;
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public class AndroidLoggerContextFactory implements LoggerContextFactory {
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private static LoggerContext context = new AndroidLoggerContext();
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@Override
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public LoggerContext getContext(
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String fqcn, ClassLoader loader, Object externalContext, boolean currentContext) {
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return context;
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}
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@Override
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public LoggerContext getContext(
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String fqcn,
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ClassLoader loader,
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Object externalContext,
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boolean currentContext,
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URI configLocation,
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String name) {
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return context;
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}
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@Override
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public void removeContext(LoggerContext context) {
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/* there is nothing for us to remove! */
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}
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}

‎src/main/resources/log4j2.component.properties‎

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log4j2.loggerContextFactory=com.celeral.android.logging.log4j.AndroidLoggerContextFactory

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