001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018package org.apache.logging.log4j.io;
019
020import java.io.IOException;
021import java.io.OutputStream;
022import java.nio.charset.Charset;
023
024import org.apache.logging.log4j.Level;
025import org.apache.logging.log4j.Marker;
026import org.apache.logging.log4j.io.internal.InternalOutputStream;
027import org.apache.logging.log4j.spi.ExtendedLogger;
028
029/**
030 * Logs each line written to a pre-defined level. Can also be configured with a Marker. This class provides an interface
031 * that follows the {@link java.io.OutputStream} methods in spirit, but doesn't require output to any external stream.
032 * This class should <em>not</em> be used as a stream for an underlying logger unless it's being used as a bridge.
033 * Otherwise, infinite loops may occur!
034 *
035 * @since 2.1
036 */
037public class LoggerOutputStream extends OutputStream {
038    private static final String FQCN = LoggerOutputStream.class.getName();
039
040    private final InternalOutputStream logger;
041
042    protected LoggerOutputStream(final ExtendedLogger logger, final Level level, final Marker marker,
043                                 final Charset charset, final String fqcn) {
044        this.logger = new InternalOutputStream(logger, level, marker, charset, fqcn == null ? FQCN : fqcn);
045    }
046
047    @Override
048    public void close() throws IOException {
049        this.logger.close();
050    }
051
052    @Override
053    public void flush() throws IOException {
054        // do nothing
055    }
056
057    @Override
058    public void write(final byte[] b) throws IOException {
059        logger.write(b);
060    }
061
062    @Override
063    public void write(final byte[] b, final int off, final int len) throws IOException {
064        logger.write(b, off, len);
065    }
066
067    @Override
068    public void write(final int b) throws IOException {
069        logger.write(b);
070    }
071}