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	/*
	* Copyright (c) 2018, 2021, 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 com.sun.org.slf4j.internal;

	import java.security.AccessController;
	import java.security.PrivilegedAction;
	import java.util.logging.Level;

	// Bridge to java.util.logging.
	public class Logger {

	/**
	* StackWalker to find out the caller of this class so that it can be
	* shown in the log output. The multiple private log0() methods below
	* skip exactly 2 frames -- one log0() itself, the other one of the
	* public debug()/warn()/error()/trace() methods in this class --
	* to find the caller.
	*/
	@SuppressWarnings("removal")
	private static final StackWalker WALKER = AccessController.doPrivileged(
	(PrivilegedAction<StackWalker>)
	() -> StackWalker.getInstance(
	StackWalker.Option.RETAIN_CLASS_REFERENCE));

	private final java.util.logging.Logger impl;

	public Logger(String name) {
	impl = java.util.logging.Logger.getLogger(name);
	}

	public boolean isDebugEnabled() {
	return impl.isLoggable(Level.FINE);
	}

	public boolean isTraceEnabled() {
	return impl.isLoggable(Level.FINE);
	}

	public void debug(String s) {
	log0(Level.FINE, s);
	}

	public void debug(String s, Throwable e) {
	log0(Level.FINE, s, e);
	}

	public void debug(String s, Object... o) {
	log0(Level.FINE, s, o);
	}

	public void trace(String s) {
	log0(Level.FINE, s);
	}

	public void error(String s) {
	log0(Level.SEVERE, s);
	}

	public void error(String s, Throwable e) {
	log0(Level.SEVERE, s, e);
	}

	public void error(String s, Object... o) {
	log0(Level.SEVERE, s, o);
	}

	public void warn(String s) {
	log0(Level.WARNING, s);
	}

	public void warn(String s, Throwable e) {
	log0(Level.WARNING, s, e);
	}

	public void warn(String s, Object... o) {
	log0(Level.WARNING, s, o);
	}

	private void log0(Level level, String s) {
	if (impl.isLoggable(level)) {
	var sf = WALKER.walk(f -> f.skip(2).findFirst()).get();
	impl.logp(Level.FINE, sf.getClassName(), sf.getMethodName(), s);
	}
	}

	private void log0(Level level, String s, Throwable e) {
	if (impl.isLoggable(level)) {
	var sf = WALKER.walk(f -> f.skip(2).findFirst()).get();
	impl.logp(Level.FINE, sf.getClassName(), sf.getMethodName(), s, e);
	}
	}

	private void log0(Level level, String s, Object... o) {
	if (impl.isLoggable(level)) {
	var sf = WALKER.walk(f -> f.skip(2).findFirst()).get();
	impl.logp(Level.FINE, sf.getClassName(), sf.getMethodName(),
	addIndex(s), o);
	}
	}

	/**
	* Translate the log4j message format "Hello {}, {}" to the
	* java.util.logging format "Hello {0}, {1}".
	*/
	private static String addIndex(String s) {
	int start = 0;
	int index = 0;
	StringBuilder sb = new StringBuilder();
	while (true) {
	int pos = s.indexOf("{}", start);
	if (pos < 0) {
	break;
	}
	sb.append(s, start, pos + 1).append(index++);
	start = pos + 1;
	}
	if (index == 0) {
	return s;
	} else {
	sb.append(s, start, s.length());
	return sb.toString();
	}
	}
	}

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