org.apache.log4j.helpers.LogLog Maven / Gradle / Ivy
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/*
* 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.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();
}
}
}