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/*
 * Copyright (C) The Apache Software Foundation. All rights reserved.
 *
 * This software is published under the terms of the Apache Software License
 * version 1.1, a copy of which has been included  with this distribution in
 * the LICENSE.txt file.
 */

package org.apache.log4j.helpers;

/**
   This class used to output log statements from within the log4j package.

   

Log4j components cannot make log4j logging calls. However, it is sometimes useful for the user to learn about what log4j is doing. You can enable log4j internal logging by defining the log4j.configDebug variable.

All log4j internal debug calls go to System.out where as internal error messages are sent to System.err. All internal messages are prepended with the string "log4j: ". @since 0.8.2 @author Ceki Gülcü */ public class LogLog { /** Defining this value makes log4j print log4j-internal debug statements to System.out.

The value of this string is log4j.debug.

Note that the search for all option names is case sensitive. */ public static final String DEBUG_KEY="log4j.debug"; /** Defining this value makes log4j components print log4j-internal debug statements to System.out.

The value of this string is log4j.configDebug.

Note that the search for all option names is case sensitive. @deprecated Use {@link #DEBUG_KEY} instead. */ public static final String CONFIG_DEBUG_KEY="log4j.configDebug"; protected static boolean debugEnabled = false; /** In quietMode not even errors generate any output. */ private static boolean quietMode = false; private static final String PREFIX = "log4j: "; private static final String ERR_PREFIX = "log4j:ERROR "; private static final String WARN_PREFIX = "log4j:WARN "; static { String key = OptionConverter.getSystemProperty(DEBUG_KEY, null); if(key == null) { key = OptionConverter.getSystemProperty(CONFIG_DEBUG_KEY, null); } if(key != null) { debugEnabled = OptionConverter.toBoolean(key, true); } } /** Allows to enable/disable log4j internal logging. */ static public void setInternalDebugging(boolean enabled) { debugEnabled = enabled; } /** This method is used to output log4j internal debug statements. Output goes to System.out. */ public static void debug(String msg) { if(debugEnabled && !quietMode) { System.out.println(PREFIX+msg); } } /** This method is used to output log4j internal debug statements. Output goes to System.out. */ public static void debug(String msg, Throwable t) { if(debugEnabled && !quietMode) { System.out.println(PREFIX+msg); if(t != null) t.printStackTrace(System.out); } } /** This method is used to output log4j internal error statements. There is no way to disable error statements. Output goes to System.err. */ public static void error(String msg) { if(quietMode) return; System.err.println(ERR_PREFIX+msg); } /** This method is used to output log4j internal error statements. There is no way to disable error statements. Output goes to System.err. */ public static void error(String msg, Throwable t) { if(quietMode) return; System.err.println(ERR_PREFIX+msg); if(t != null) { t.printStackTrace(); } } /** In quite mode no LogLog generates strictly no output, not even for errors. @param quietMode A true for not */ public static void setQuietMode(boolean quietMode) { LogLog.quietMode = quietMode; } /** This method is used to output log4j internal warning statements. There is no way to disable warning statements. Output goes to System.err. */ public static void warn(String msg) { if(quietMode) return; System.err.println(WARN_PREFIX+msg); } /** This method is used to output log4j internal warnings. There is no way to disable warning statements. Output goes to System.err. */ public static void warn(String msg, Throwable t) { if(quietMode) return; System.err.println(WARN_PREFIX+msg); if(t != null) { t.printStackTrace(); } } }

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