/*
* @(#)Logger.java 1.6 05/11/17
*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* -Redistribution of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* -Redistribution in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
* AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
* AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
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*
* You acknowledge that this software is not designed, licensed or intended
* for use in the design, construction, operation or maintenance of any
* nuclear facility.
*/
package jnlp.sample.servlet;
import java.text.MessageFormat;
import java.util.*;
import java.io.*;
import javax.servlet.*;
/* A loging object used by the servlets */
public class Logger {
// Logging levels
public final static int NONE = 0;
public static final String NONE_KEY = "NONE";
public final static int FATAL = 1;
public static final String FATAL_KEY = "FATAL";
public final static int WARNING = 2;
public static final String WARNING_KEY = "WARNING";
public final static int INFORMATIONAL = 3;
public static final String INFORMATIONAL_KEY = "INFORMATIONAL";
public final static int DEBUG = 4;
public static final String DEBUG_KEY = "DEBUG";
// Configuration parameters
private final static String LOG_LEVEL = "logLevel";
private final static String LOG_PATH = "logPath";
private int _loggingLevel = FATAL;
private ServletContext _servletContext = null;
private String _logFile = null;
private String _servletName = null;
// Localization
ResourceBundle _resources = null;
/** Initialize logging object. It reads the logLevel and pathLevel init parameters.
* Default is logging level FATAL, and logging using the ServletContext.log
*/
public Logger(ServletConfig config, ResourceBundle resources) {
_resources = resources;
_servletContext = config.getServletContext();
_servletName = config.getServletName();
_logFile = config.getInitParameter(LOG_PATH);
if (_logFile != null) {
_logFile = _logFile.trim();
if (_logFile.length() == 0) _logFile = null;
}
String level = config.getInitParameter(LOG_LEVEL);
if (level != null) {
level = level.trim().toUpperCase();
if (level.equals(NONE_KEY)) _loggingLevel = NONE;
if (level.equals(FATAL_KEY)) _loggingLevel = FATAL;
if (level.equals(WARNING_KEY)) _loggingLevel = WARNING;
if (level.equals(INFORMATIONAL_KEY)) _loggingLevel = INFORMATIONAL;
if (level.equals(DEBUG_KEY)) _loggingLevel = DEBUG;
}
}
// Logging API. Fatal, Warning, and Informational are localized
public void addFatal(String key, Throwable throwable) {
logEvent(FATAL, getString(key), throwable);
}
public void addWarning(String key, String arg) {
logL10N(WARNING, key, arg, (Throwable)null);
}
public void addWarning(String key, String arg, Throwable t) {
logL10N(WARNING, key, arg, t);
}
public void addWarning(String key, String arg1, String arg2) {
logL10N(WARNING, key, arg1, arg2);
}
public void addWarning(String key, String arg1, String arg2, String arg3) {
logL10N(WARNING, key, arg1, arg2, arg3);
}
public void addInformational(String key) {
logEvent(INFORMATIONAL, getString(key), (Throwable)null);
}
public void addInformational(String key, String arg) {
logL10N(INFORMATIONAL, key, arg, (Throwable)null);
}
public void addInformational(String key, String arg1, String arg2, String arg3) {
logL10N(INFORMATIONAL, key, arg1, arg2, arg3);
}
// Debug messages are not localized
public void addDebug(String msg) { logEvent(DEBUG, msg, null); }
public void addDebug(String msg, Throwable throwable) {
logEvent(DEBUG, msg, throwable);
}
// Query to test for level
boolean isNoneLevel() { return _loggingLevel >= NONE; }
boolean isFatalevel() { return _loggingLevel >= FATAL; }
boolean isWarningLevel() { return _loggingLevel >= WARNING; }
boolean isInformationalLevel() { return _loggingLevel >= INFORMATIONAL; }
boolean isDebugLevel() { return _loggingLevel >= DEBUG; }
// Returns a string from the resources
private String getString(String key) {
try {
return _resources.getString(key);
} catch (MissingResourceException mre) {
return "Missing resource for: " + key;
}
}
private void logL10N(int level, String key, String arg, Throwable e) {
Object[] messageArguments = { arg };
logEvent(level, applyPattern(key, messageArguments), e);
}
private void logL10N(int level, String key, String arg1, String arg2) {
Object[] messageArguments = { arg1, arg2 };
logEvent(level, applyPattern(key, messageArguments), null);
}
private void logL10N(int level, String key, String arg1, String arg2, String arg3) {
Object[] messageArguments = { arg1, arg2, arg3 };
logEvent(level, applyPattern(key, messageArguments), null);
}
/** Helper function that applies the messageArguments to a message from the resource object */
private String applyPattern(String key, Object[] messageArguments) {
String message = getString(key);
MessageFormat formatter = new MessageFormat(message);
String output = formatter.format(message, messageArguments);
return output;
}
// The method that actually does the logging */
private synchronized void logEvent(int level, String string, Throwable throwable) {
// Check if the event should be logged
if (level > _loggingLevel) return;
if (_logFile != null) {
// No logfile specified, log using servlet context
PrintWriter pw = null;
try {
pw = new PrintWriter(new FileWriter(_logFile, true));
pw.println(_servletName + "(" + level + "): " + string);
if (throwable != null) {
throwable.printStackTrace(pw);
}
pw.close();
// Do a return here. An exception will cause a fall through to
// do _servletContex logging API
return;
} catch (IOException ioe) {
/* just ignore */
}
}
// Otherwise, write to servlet context log
if (throwable == null) {
_servletContext.log(string);
} else {
_servletContext.log(string, throwable);
}
}
}