/*
 * 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.logging.log4j.util;

import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Writer;
import java.util.Objects;

PrintWriter-based logging utility for classes too low level to use StatusLogger. Such classes cannot use StatusLogger as StatusLogger or SimpleLogger depends on them for initialization. Other framework classes should stick to using StatusLogger. 
Since:
2.6/**
 * PrintWriter-based logging utility for classes too low level to use {@link org.apache.logging.log4j.status.StatusLogger}.
 * Such classes cannot use StatusLogger as StatusLogger or {@link org.apache.logging.log4j.simple.SimpleLogger} depends
 * on them for initialization. Other framework classes should stick to using StatusLogger.
 *
 * @since 2.6
 */
final class LowLevelLogUtil {

    private static PrintWriter writer = new PrintWriter(System.err, true);

    
Logs the given message.
Params:
message – the message to log
Since:
2.9.2/**
     * Logs the given message.
     * 
     * @param message the message to log
     * @since 2.9.2
     */
    public static void log(final String message) {
        if (message != null) {
            writer.println(message);
        }
    }

    public static void logException(final Throwable exception) {
        if (exception != null) {
            exception.printStackTrace(writer);
        }
    }

    public static void logException(final String message, final Throwable exception) {
        log(message);
        logException(exception);
    }

    
Sets the underlying OutputStream where exceptions are printed to.
Params:
out – the OutputStream to log to/**
     * Sets the underlying OutputStream where exceptions are printed to.
     *
     * @param out the OutputStream to log to
     */
    public static void setOutputStream(final OutputStream out) {
        LowLevelLogUtil.writer = new PrintWriter(Objects.requireNonNull(out), true);
    }

    
Sets the underlying Writer where exceptions are printed to.
Params:
writer – the Writer to log to/**
     * Sets the underlying Writer where exceptions are printed to.
     *
     * @param writer the Writer to log to
     */
    public static void setWriter(final Writer writer) {
        LowLevelLogUtil.writer = new PrintWriter(Objects.requireNonNull(writer), true);
    }

    private LowLevelLogUtil() {
    }
}