* <code>logger.debug("Some log message with varargs. Details: {}, {}, {}", someObject1, someObject2, someObject3); * </li> * </ul> * </p> * * <p>Logger instances created using the LoggerFactory are named either according to the name * or the fully qualified class name of the class given as a parameter. * Each logger name will be used as the log message tag on the Android platform. * However, tag names cannot be longer than 23 characters so if logger name exceeds this limit then * it will be truncated by the LoggerFactory. The following examples illustrate this. * <table border="1"> * <tr> * <tr> * <tr> * <tr> * <tr> * </table> * </p> * * @author Andrey Korzhevskiy <a.korzhevskiy@gmail.com> */ class AndroidLoggerAdapter extends MarkerIgnoringBase { private static final long serialVersionUID = -1227274521521287937L; /** * Package access allows only {@link AndroidLoggerFactory} to instantiate * SimpleLogger instances. */ AndroidLoggerAdapter(String tag) { this.name = tag; } /** * Is this logger instance enabled for the VERBOSE level? * * @return True if this Logger is enabled for level VERBOSE, false otherwise. */ public boolean isTraceEnabled() { return isLoggable(Log.VERBOSE); } /** * Log a message object at level VERBOSE. * * @param msg * - the message object to be logged */ public void trace(String msg) { log(Log.VERBOSE, msg, null); } /** * Log a message at level VERBOSE according to the specified format and * argument. * * <p> * This form avoids superfluous object creation when the logger is disabled * for level VERBOSE. * </p> * * @param format * the format string * @param arg * the argument */ public void trace(String format, Object arg) { formatAndLog(Log.VERBOSE, format, arg); } /** * Log a message at level VERBOSE according to the specified format and * arguments. * * <p> * This form avoids superfluous object creation when the logger is disabled * for the VERBOSE level. * </p> * * @param format * the format string * @param arg1 * the first argument * @param arg2 * the second argument */ public void trace(String format, Object arg1, Object arg2) { formatAndLog(Log.VERBOSE, format, arg1, arg2); } /** * Log a message at level VERBOSE according to the specified format and * arguments. * * <p> * This form avoids superfluous object creation when the logger is disabled * for the VERBOSE level. * </p> * * @param format * the format string * @param argArray * an array of arguments */ public void trace(String format, Object... argArray) { formatAndLog(Log.VERBOSE, format, argArray); } /** * Log an exception (throwable) at level VERBOSE with an accompanying message. * * @param msg * the message accompanying the exception * @param t * the exception (throwable) to log */ public void trace(String msg, Throwable t) { log(Log.VERBOSE, msg, t); } /** * Is this logger instance enabled for the DEBUG level? * * @return True if this Logger is enabled for level DEBUG, false otherwise. */ public boolean isDebugEnabled() { return isLoggable(Log.DEBUG); } /** * Log a message object at level DEBUG. * * @param msg * - the message object to be logged */ public void debug(String msg) { log(Log.DEBUG, msg, null); } /** * Log a message at level DEBUG according to the specified format and argument. * * <p> * This form avoids superfluous object creation when the logger is disabled * for level DEBUG. * </p> * * @param format * the format string * @param arg * the argument */ public void debug(String format, Object arg) { formatAndLog(Log.DEBUG, format, arg); } /** * Log a message at level DEBUG according to the specified format and * arguments. * * <p> * This form avoids superfluous object creation when the logger is disabled * for the DEBUG level. * </p> * * @param format * the format string * @param arg1 * the first argument * @param arg2 * the second argument */ public void debug(String format, Object arg1, Object arg2) { formatAndLog(Log.DEBUG, format, arg1, arg2); } /** * Log a message at level DEBUG according to the specified format and * arguments. * * <p> * This form avoids superfluous object creation when the logger is disabled * for the DEBUG level. * </p> * * @param format * the format string * @param argArray * an array of arguments */ public void debug(String format, Object... argArray) { formatAndLog(Log.DEBUG, format, argArray); } /** * Log an exception (throwable) at level DEBUG with an accompanying message. * * @param msg * the message accompanying the exception * @param t * the exception (throwable) to log */ public void debug(String msg, Throwable t) { log(Log.VERBOSE, msg, t); } /** * Is this logger instance enabled for the INFO level? * * @return True if this Logger is enabled for the INFO level, false otherwise. */ public boolean isInfoEnabled() { return isLoggable(Log.INFO); } /** * Log a message object at the INFO level. * * @param msg * - the message object to be logged */ public void info(String msg) { log(Log.INFO, msg, null); } /** * Log a message at level INFO according to the specified format and argument. * * <p> * This form avoids superfluous object creation when the logger is disabled * for the INFO level. * </p> * * @param format * the format string * @param arg * the argument */ public void info(String format, Object arg) { formatAndLog(Log.INFO, format, arg); } /** * Log a message at the INFO level according to the specified format and * arguments. * * <p> * This form avoids superfluous object creation when the logger is disabled * for the INFO level. * </p> * * @param format * the format string * @param arg1 * the first argument * @param arg2 * the second argument */ public void info(String format, Object arg1, Object arg2) { formatAndLog(Log.INFO, format, arg1, arg2); } /** * Log a message at level INFO according to the specified format and * arguments. * * <p> * This form avoids superfluous object creation when the logger is disabled * for the INFO level. * </p> * * @param format * the format string * @param argArray * an array of arguments */ public void info(String format, Object... argArray) { formatAndLog(Log.INFO, format, argArray); } /** * Log an exception (throwable) at the INFO level with an accompanying * message. * * @param msg * the message accompanying the exception * @param t * the exception (throwable) to log */ public void info(String msg, Throwable t) { log(Log.INFO, msg, t); } /** * Is this logger instance enabled for the WARN level? * * @return True if this Logger is enabled for the WARN level, false * otherwise. */ public boolean isWarnEnabled() { return isLoggable(Log.WARN); } /** * Log a message object at the WARN level. * * @param msg * - the message object to be logged */ public void warn(String msg) { log(Log.WARN, msg, null); } /** * Log a message at the WARN level according to the specified format and * argument. * * <p> * This form avoids superfluous object creation when the logger is disabled * for the WARN level. * </p> * * @param format * the format string * @param arg * the argument */ public void warn(String format, Object arg) { formatAndLog(Log.WARN, format, arg); } /** * Log a message at the WARN level according to the specified format and * arguments. * * <p> * This form avoids superfluous object creation when the logger is disabled * for the WARN level. * </p> * * @param format * the format string * @param arg1 * the first argument * @param arg2 * the second argument */ public void warn(String format, Object arg1, Object arg2) { formatAndLog(Log.WARN, format, arg1, arg2); } /** * Log a message at level WARN according to the specified format and * arguments. * * <p> * This form avoids superfluous object creation when the logger is disabled * for the WARN level. * </p> * * @param format * the format string * @param argArray * an array of arguments */ public void warn(String format, Object... argArray) { formatAndLog(Log.WARN, format, argArray); } /** * Log an exception (throwable) at the WARN level with an accompanying * message. * * @param msg * the message accompanying the exception * @param t * the exception (throwable) to log */ public void warn(String msg, Throwable t) { log(Log.WARN, msg, t); } /** * Is this logger instance enabled for level ERROR? * * @return True if this Logger is enabled for level ERROR, false otherwise. */ public boolean isErrorEnabled() { return isLoggable(Log.ERROR); } /** * Log a message object at the ERROR level. * * @param msg * - the message object to be logged */ public void error(String msg) { log(Log.ERROR, msg, null); } /** * Log a message at the ERROR level according to the specified format and * argument. * * <p> * This form avoids superfluous object creation when the logger is disabled * for the ERROR level. * </p> * * @param format * the format string * @param arg * the argument */ public void error(String format, Object arg) { formatAndLog(Log.ERROR, format, arg); } /** * Log a message at the ERROR level according to the specified format and * arguments. * * <p> * This form avoids superfluous object creation when the logger is disabled * for the ERROR level. * </p> * * @param format * the format string * @param arg1 * the first argument * @param arg2 * the second argument */ public void error(String format, Object arg1, Object arg2) { formatAndLog(Log.ERROR, format, arg1, arg2); } /** * Log a message at level ERROR according to the specified format and * arguments. * * <p> * This form avoids superfluous object creation when the logger is disabled * for the ERROR level. * </p> * * @param format * the format string * @param argArray * an array of arguments */ public void error(String format, Object... argArray) { formatAndLog(Log.ERROR, format, argArray); } /** * Log an exception (throwable) at the ERROR level with an accompanying * message. * * @param msg * the message accompanying the exception * @param t * the exception (throwable) to log */ public void error(String msg, Throwable t) { log(Log.ERROR, msg, t); } private void formatAndLog(int priority, String format, Object... argArray) { if (isLoggable(priority)) { FormattingTuple ft = MessageFormatter.arrayFormat(format, argArray); logInternal(priority, ft.getMessage(), ft.getThrowable()); } } private void log(int priority, String message, Throwable throwable) { if (isLoggable(priority)) { logInternal(priority, message, throwable); } } private boolean isLoggable(int priority) { return Log.isLoggable(name, priority); } private void logInternal(int priority, String message, Throwable throwable) { if (throwable != null) { message += '\n' + Log.getStackTraceString(throwable); } Log.println(priority, name, message); } }
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The AndroidLoggerAdapter.java Java example source code/*
* Copyright (c) 2004-2013 QOS.ch
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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package org.slf4j.impl;
import android.util.Log;
import org.slf4j.helpers.FormattingTuple;
import org.slf4j.helpers.MarkerIgnoringBase;
import org.slf4j.helpers.MessageFormatter;
/**
* <p>A simple implementation that delegates all log requests to the Google Android
* logging facilities. Note that this logger does not support {@link org.slf4j.Marker}.
* Methods taking marker data as parameter simply invoke the eponymous method
* without the Marker argument, discarding any marker data in the process.</p>
*
* <p>The logging levels specified for SLF4J can be almost directly mapped to
* the levels that exist in the Google Android platform. The following table
* shows the mapping implemented by this logger.</p>
*
* <table border="1">
* <tr> | SLF4J | Android | |
|---|---|---|---|
| TRACE | {@link android.util.Log#VERBOSE} | ||
| DEBUG | {@link android.util.Log#DEBUG} | ||
| INFO | {@link android.util.Log#INFO} | ||
| WARN | {@link android.util.Log#WARN} | ||
| ERROR | {@link android.util.Log#ERROR} | ||
| Original Name | Truncated Name | ||
| org.example.myproject.mypackage.MyClass | o*.e*.m*.m*.MyClass | ||
| o.e.myproject.mypackage.MyClass | o.e.m*.m*.MyClass | ||
| org.example.ThisNameIsWayTooLongAndWillBeTruncated | *LongAndWillBeTruncated | ||
| ThisNameIsWayTooLongAndWillBeTruncated | *LongAndWillBeTruncated |
