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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 1997-2009 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
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package com.sun.istack.logging;

import com.sun.istack.NotNull;

import java.util.StringTokenizer;
import java.util.logging.Level;

/**
 * This is a helper class that provides some conveniece methods wrapped around the
 * standard {@link java.util.logging.Logger} interface.
 *
 * The class also makes sure that logger names of each Metro subsystem are consistent
 * with each other.
 *
 * @author Marek Potociar 
 * @author Fabian Ritzmann
 */
public class Logger {

    private static final String WS_LOGGING_SUBSYSTEM_NAME_ROOT = "com.sun.metro";
    private static final String ROOT_WS_PACKAGE = "com.sun.xml.ws.";
    //
    private static final Level METHOD_CALL_LEVEL_VALUE = Level.FINEST;
    //
    private final String componentClassName;
    private final java.util.logging.Logger logger;

    /**
     * Prevents creation of a new instance of this Logger unless used by a subclass.
     */
    protected Logger(final String systemLoggerName, final String componentName) {
        this.componentClassName = "[" + componentName + "] ";
        this.logger = java.util.logging.Logger.getLogger(systemLoggerName);
    }

    /**
     * 

* The factory method returns preconfigured Logger wrapper for the class. Method calls * {@link #getSystemLoggerName(java.lang.Class)} to generate default logger name. *

*

* Since there is no caching implemented, it is advised that the method is called only once * per a class in order to initialize a final static logger variable, which is then used * through the class to perform actual logging tasks. *

* * @param componentClass class of the component that will use the logger instance. Must not be {@code null}. * @return logger instance preconfigured for use with the component * @throws NullPointerException if the componentClass parameter is {@code null}. */ public static @NotNull Logger getLogger(final @NotNull Class componentClass) { return new Logger(getSystemLoggerName(componentClass), componentClass.getName()); } /** * The factory method returns preconfigured Logger wrapper for the class. Since there is no caching implemented, * it is advised that the method is called only once per a class in order to initialize a final static logger variable, * which is then used through the class to perform actual logging tasks. * * This method should be only used in a special cases when overriding of a default logger name derived from the * package of the component class is needed. For all common use cases please use {@link #getLogger(java.lang.Class)} * method. * * @param customLoggerName custom name of the logger. * @param componentClass class of the component that will use the logger instance. Must not be {@code null}. * @return logger instance preconfigured for use with the component * @throws NullPointerException if the componentClass parameter is {@code null}. * * @see #getLogger(java.lang.Class) */ public static @NotNull Logger getLogger(final @NotNull String customLoggerName, final @NotNull Class componentClass) { return new Logger(customLoggerName, componentClass.getName()); } /** * Calculates the subsystem suffix based on the package of the component class * @param componentClass class of the component that will use the logger instance. Must not be {@code null}. * @return system logger name for the given {@code componentClass} instance */ static final String getSystemLoggerName(@NotNull Class componentClass) { StringBuilder sb = new StringBuilder(componentClass.getPackage().getName()); final int lastIndexOfWsPackage = sb.lastIndexOf(ROOT_WS_PACKAGE); if (lastIndexOfWsPackage > -1) { sb.replace(0, lastIndexOfWsPackage + ROOT_WS_PACKAGE.length(), ""); StringTokenizer st = new StringTokenizer(sb.toString(), "."); sb = new StringBuilder(WS_LOGGING_SUBSYSTEM_NAME_ROOT).append("."); if (st.hasMoreTokens()) { String token = st.nextToken(); if ("api".equals(token)) { token = st.nextToken(); } sb.append(token); } } return sb.toString(); } public void log(final Level level, final String message) { if (!this.logger.isLoggable(level)) { return; } logger.logp(level, componentClassName, getCallerMethodName(), message); } public void log(final Level level, final String message, final Throwable thrown) { if (!this.logger.isLoggable(level)) { return; } logger.logp(level, componentClassName, getCallerMethodName(), message, thrown); } public void finest(final String message) { if (!this.logger.isLoggable(Level.FINEST)) { return; } logger.logp(Level.FINEST, componentClassName, getCallerMethodName(), message); } public void finest(final String message, final Throwable thrown) { if (!this.logger.isLoggable(Level.FINEST)) { return; } logger.logp(Level.FINEST, componentClassName, getCallerMethodName(), message, thrown); } public void finer(final String message) { if (!this.logger.isLoggable(Level.FINER)) { return; } logger.logp(Level.FINER, componentClassName, getCallerMethodName(), message); } public void finer(final String message, final Throwable thrown) { if (!this.logger.isLoggable(Level.FINER)) { return; } logger.logp(Level.FINER, componentClassName, getCallerMethodName(), message, thrown); } public void fine(final String message) { if (!this.logger.isLoggable(Level.FINE)) { return; } logger.logp(Level.FINE, componentClassName, getCallerMethodName(), message); } public void fine(final String message, final Throwable thrown) { if (!this.logger.isLoggable(Level.FINE)) { return; } logger.logp(Level.FINE, componentClassName, getCallerMethodName(), message, thrown); } public void info(final String message) { if (!this.logger.isLoggable(Level.INFO)) { return; } logger.logp(Level.INFO, componentClassName, getCallerMethodName(), message); } public void info(final String message, final Throwable thrown) { if (!this.logger.isLoggable(Level.INFO)) { return; } logger.logp(Level.INFO, componentClassName, getCallerMethodName(), message, thrown); } public void config(final String message) { if (!this.logger.isLoggable(Level.CONFIG)) { return; } logger.logp(Level.CONFIG, componentClassName, getCallerMethodName(), message); } public void config(final String message, final Throwable thrown) { if (!this.logger.isLoggable(Level.CONFIG)) { return; } logger.logp(Level.CONFIG, componentClassName, getCallerMethodName(), message, thrown); } public void warning(final String message) { if (!this.logger.isLoggable(Level.WARNING)) { return; } logger.logp(Level.WARNING, componentClassName, getCallerMethodName(), message); } public void warning(final String message, final Throwable thrown) { if (!this.logger.isLoggable(Level.WARNING)) { return; } logger.logp(Level.WARNING, componentClassName, getCallerMethodName(), message, thrown); } public void severe(final String message) { if (!this.logger.isLoggable(Level.SEVERE)) { return; } logger.logp(Level.SEVERE, componentClassName, getCallerMethodName(), message); } public void severe(final String message, final Throwable thrown) { if (!this.logger.isLoggable(Level.SEVERE)) { return; } logger.logp(Level.SEVERE, componentClassName, getCallerMethodName(), message, thrown); } public boolean isMethodCallLoggable() { return this.logger.isLoggable(METHOD_CALL_LEVEL_VALUE); } public boolean isLoggable(final Level level) { return this.logger.isLoggable(level); } public void setLevel(final Level level) { this.logger.setLevel(level); } public void entering() { if (!this.logger.isLoggable(METHOD_CALL_LEVEL_VALUE)) { return; } logger.entering(componentClassName, getCallerMethodName()); } public void entering(final Object... parameters) { if (!this.logger.isLoggable(METHOD_CALL_LEVEL_VALUE)) { return; } logger.entering(componentClassName, getCallerMethodName(), parameters); } public void exiting() { if (!this.logger.isLoggable(METHOD_CALL_LEVEL_VALUE)) { return; } logger.exiting(componentClassName, getCallerMethodName()); } public void exiting(final Object result) { if (!this.logger.isLoggable(METHOD_CALL_LEVEL_VALUE)) { return; } logger.exiting(componentClassName, getCallerMethodName(), result); } /** * Method logs {@code exception}'s message as a {@code SEVERE} logging level * message. *

* If {@code cause} parameter is not {@code null}, it is logged as well and * {@code exception} original cause is initialized with instance referenced * by {@code cause} parameter. * * @param exception exception whose message should be logged. Must not be * {@code null}. * @param cause initial cause of the exception that should be logged as well * and set as {@code exception}'s original cause. May be {@code null}. * @return the same exception instance that was passed in as the {@code exception} * parameter. */ public T logSevereException(final T exception, final Throwable cause) { if (this.logger.isLoggable(Level.SEVERE)) { if (cause == null) { logger.logp(Level.SEVERE, componentClassName, getCallerMethodName(), exception.getMessage()); } else { exception.initCause(cause); logger.logp(Level.SEVERE, componentClassName, getCallerMethodName(), exception.getMessage(), cause); } } return exception; } /** * Method logs {@code exception}'s message as a {@code SEVERE} logging level * message. *

* If {@code logCause} parameter is {@code true}, {@code exception}'s original * cause is logged as well (if exists). This may be used in cases when * {@code exception}'s class provides constructor to initialize the original * cause. In such case you do not need to use * {@link #logSevereException(Throwable, Throwable)} * method version but you might still want to log the original cause as well. * * @param exception exception whose message should be logged. Must not be * {@code null}. * @param logCause deterimnes whether initial cause of the exception should * be logged as well * @return the same exception instance that was passed in as the {@code exception} * parameter. */ public T logSevereException(final T exception, final boolean logCause) { if (this.logger.isLoggable(Level.SEVERE)) { if (logCause && exception.getCause() != null) { logger.logp(Level.SEVERE, componentClassName, getCallerMethodName(), exception.getMessage(), exception.getCause()); } else { logger.logp(Level.SEVERE, componentClassName, getCallerMethodName(), exception.getMessage()); } } return exception; } /** * Same as {@link #logSevereException(Throwable, boolean) logSevereException(exception, true)}. */ public T logSevereException(final T exception) { if (this.logger.isLoggable(Level.SEVERE)) { if (exception.getCause() == null) { logger.logp(Level.SEVERE, componentClassName, getCallerMethodName(), exception.getMessage()); } else { logger.logp(Level.SEVERE, componentClassName, getCallerMethodName(), exception.getMessage(), exception.getCause()); } } return exception; } /** * Method logs {@code exception}'s message at the logging level specified by the * {@code level} argument. *

* If {@code cause} parameter is not {@code null}, it is logged as well and * {@code exception} original cause is initialized with instance referenced * by {@code cause} parameter. * * @param exception exception whose message should be logged. Must not be * {@code null}. * @param cause initial cause of the exception that should be logged as well * and set as {@code exception}'s original cause. May be {@code null}. * @param level loging level which should be used for logging * @return the same exception instance that was passed in as the {@code exception} * parameter. */ public T logException(final T exception, final Throwable cause, final Level level) { if (this.logger.isLoggable(level)) { if (cause == null) { logger.logp(level, componentClassName, getCallerMethodName(), exception.getMessage()); } else { exception.initCause(cause); logger.logp(level, componentClassName, getCallerMethodName(), exception.getMessage(), cause); } } return exception; } /** * Method logs {@code exception}'s message at the logging level specified by the * {@code level} argument. *

* If {@code logCause} parameter is {@code true}, {@code exception}'s original * cause is logged as well (if exists). This may be used in cases when * {@code exception}'s class provides constructor to initialize the original * cause. In such case you do not need to use * {@link #logException(Throwable, Throwable, Level) logException(exception, cause, level)} * method version but you might still want to log the original cause as well. * * @param exception exception whose message should be logged. Must not be * {@code null}. * @param logCause deterimnes whether initial cause of the exception should * be logged as well * @param level loging level which should be used for logging * @return the same exception instance that was passed in as the {@code exception} * parameter. */ public T logException(final T exception, final boolean logCause, final Level level) { if (this.logger.isLoggable(level)) { if (logCause && exception.getCause() != null) { logger.logp(level, componentClassName, getCallerMethodName(), exception.getMessage(), exception.getCause()); } else { logger.logp(level, componentClassName, getCallerMethodName(), exception.getMessage()); } } return exception; } /** * Same as {@link #logException(Throwable, Throwable, Level) * logException(exception, true, level)}. */ public T logException(final T exception, final Level level) { if (this.logger.isLoggable(level)) { if (exception.getCause() == null) { logger.logp(level, componentClassName, getCallerMethodName(), exception.getMessage()); } else { logger.logp(level, componentClassName, getCallerMethodName(), exception.getMessage(), exception.getCause()); } } return exception; } /** * Function returns the name of the caller method for the method executing this * function. * * @return caller method name from the call stack of the current {@link Thread}. */ private static String getCallerMethodName() { return getStackMethodName(5); } /** * Method returns the name of the method that is on the {@code methodIndexInStack} * position in the call stack of the current {@link Thread}. * * @param methodIndexInStack index to the call stack to get the method name for. * @return the name of the method that is on the {@code methodIndexInStack} * position in the call stack of the current {@link Thread}. */ private static String getStackMethodName(final int methodIndexInStack) { final String methodName; final StackTraceElement[] stack = Thread.currentThread().getStackTrace(); if (stack.length > methodIndexInStack + 1) { methodName = stack[methodIndexInStack].getMethodName(); } else { methodName = "UNKNOWN METHOD"; } return methodName; } }





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