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	/*
	* Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/


	package sun.util.logging;

	import java.lang.reflect.Field;
	import java.security.AccessController;
	import java.security.PrivilegedAction;
	import java.util.Date;

	/**
	* Internal API to support JRE implementation to detect if the java.util.logging
	* support is available but with no dependency on the java.util.logging
	* classes. This LoggingSupport class provides several static methods to
	* access the java.util.logging functionality that requires the caller
	* to ensure that the logging support is {@linkplain #isAvailable available}
	* before invoking it.
	*
	* @see sun.util.logging.PlatformLogger if you want to log messages even
	* if the logging support is not available
	*/
	public class LoggingSupport {
	private LoggingSupport() { }

	private static final LoggingProxy proxy =
	AccessController.doPrivileged(new PrivilegedAction<LoggingProxy>() {
	public LoggingProxy run() {
	try {
	// create a LoggingProxyImpl instance when
	// java.util.logging classes exist
	Class<?> c = Class.forName("java.util.logging.LoggingProxyImpl", true, null);
	Field f = c.getDeclaredField("INSTANCE");
	f.setAccessible(true);
	return (LoggingProxy) f.get(null);
	} catch (ClassNotFoundException cnf) {
	return null;
	} catch (NoSuchFieldException e) {
	throw new AssertionError(e);
	} catch (IllegalAccessException e) {
	throw new AssertionError(e);
	}
	}});

	/**
	* Returns true if java.util.logging support is available.
	*/
	public static boolean isAvailable() {
	return proxy != null;
	}

	private static void ensureAvailable() {
	if (proxy == null)
	throw new AssertionError("Should not here");
	}

	public static java.util.List<String> getLoggerNames() {
	ensureAvailable();
	return proxy.getLoggerNames();
	}
	public static String getLoggerLevel(String loggerName) {
	ensureAvailable();
	return proxy.getLoggerLevel(loggerName);
	}

	public static void setLoggerLevel(String loggerName, String levelName) {
	ensureAvailable();
	proxy.setLoggerLevel(loggerName, levelName);
	}

	public static String getParentLoggerName(String loggerName) {
	ensureAvailable();
	return proxy.getParentLoggerName(loggerName);
	}

	public static Object getLogger(String name) {
	ensureAvailable();
	return proxy.getLogger(name);
	}

	public static Object getLevel(Object logger) {
	ensureAvailable();
	return proxy.getLevel(logger);
	}

	public static void setLevel(Object logger, Object newLevel) {
	ensureAvailable();
	proxy.setLevel(logger, newLevel);
	}

	public static boolean isLoggable(Object logger, Object level) {
	ensureAvailable();
	return proxy.isLoggable(logger,level);
	}

	public static void log(Object logger, Object level, String msg) {
	ensureAvailable();
	proxy.log(logger, level, msg);
	}

	public static void log(Object logger, Object level, String msg, Throwable t) {
	ensureAvailable();
	proxy.log(logger, level, msg, t);
	}

	public static void log(Object logger, Object level, String msg, Object... params) {
	ensureAvailable();
	proxy.log(logger, level, msg, params);
	}

	public static Object parseLevel(String levelName) {
	ensureAvailable();
	return proxy.parseLevel(levelName);
	}

	public static String getLevelName(Object level) {
	ensureAvailable();
	return proxy.getLevelName(level);
	}

	public static int getLevelValue(Object level) {
	ensureAvailable();
	return proxy.getLevelValue(level);
	}

	private static final String DEFAULT_FORMAT =
	"%1$tb %1$td, %1$tY %1$tl:%1$tM:%1$tS %1$Tp %2$s%n%4$s: %5$s%6$s%n";

	private static final String FORMAT_PROP_KEY = "java.util.logging.SimpleFormatter.format";
	public static String getSimpleFormat() {
	return getSimpleFormat(true);
	}

	// useProxy if true will cause initialization of
	// java.util.logging and read its configuration
	static String getSimpleFormat(boolean useProxy) {
	String format =
	AccessController.doPrivileged(
	new PrivilegedAction<String>() {
	public String run() {
	return System.getProperty(FORMAT_PROP_KEY);
	}
	});

	if (useProxy && proxy != null && format == null) {
	format = proxy.getProperty(FORMAT_PROP_KEY);
	}

	if (format != null) {
	try {
	// validate the user-defined format string
	String.format(format, new Date(), "", "", "", "", "");
	} catch (IllegalArgumentException e) {
	// illegal syntax; fall back to the default format
	format = DEFAULT_FORMAT;
	}
	} else {
	format = DEFAULT_FORMAT;
	}
	return format;
	}

	}

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