Apache Log4j IOStreams is a Log4j API extension that provides numerous classes from java.io that can either write to a Logger while writing to another OutputStream or Writer, or the contents read by an InputStream or Reader can be wiretapped by a Logger.

Bytecode (Java 8) for Apache Log4j IOStreams is provided in a separate JAR file like log4j-iostreams-2.14.1.jar.

Source Code files for Apache Log4j IOStreams are provided in both binary packge like apache-log4j-2.14.1-bin.zip and source package like apache-log4j-2.14.1-src.zip. You can download them at Apache Log4j Website.

You can also browse Source Code files for Apache Log4j IOStreams 2.14.1 below.

⏎ org/apache/logging/log4j/io/internal/InternalPrintStream.java

/*
 * 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.io.internal;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.util.Locale;

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.Marker;
import org.apache.logging.log4j.spi.ExtendedLogger;

/**
 * Internal class used primarily to allow location calculations to work properly.
 *
 * @since 2.12
 */
public class InternalPrintStream extends PrintStream {

    public InternalPrintStream(final ExtendedLogger logger, final boolean autoFlush, final Charset charset,
                                final String fqcn, final Level level, final Marker marker)
        throws UnsupportedEncodingException {
        super(new InternalOutputStream(logger, level, marker, ensureNonNull(charset), fqcn),
            autoFlush, ensureNonNull(charset).name());
    }

    public InternalPrintStream(final OutputStream out, final boolean autoFlush, final Charset charset,
                                final ExtendedLogger logger, final String fqcn, final Level level, final Marker marker)
        throws UnsupportedEncodingException {
        super(new InternalFilterOutputStream(out, ensureNonNull(charset), logger, fqcn, level,
            marker), autoFlush, ensureNonNull(charset).name());
    }

    private static Charset ensureNonNull(final Charset charset) {
        return charset == null ? Charset.defaultCharset() : charset;
    }

    @Override
    public InternalPrintStream append(final char c) {
        super.append(c);
        return this;
    }

    @Override
    public InternalPrintStream append(final CharSequence csq) {
        super.append(csq);
        return this;
    }

    @Override
    public InternalPrintStream append(final CharSequence csq, final int start, final int end) {
        super.append(csq, start, end);
        return this;
    }

    @Override
    public boolean checkError() {
        return super.checkError();
    }

    @Override
    public void close() {
        super.close();
    }

    @Override
    public void flush() {
        super.flush();
    }

    @Override
    public InternalPrintStream format(final Locale l, final String format, final Object... args) {
        super.format(l, format, args);
        return this;
    }

    @Override
    public InternalPrintStream format(final String format, final Object... args) {
        super.format(format, args);
        return this;
    }

    @Override
    public void print(final boolean b) {
        super.print(b);
    }

    @Override
    public void print(final char c) {
        super.print(c);
    }

    @Override
    public void print(final char[] s) {
        super.print(s);
    }

    @Override
    public void print(final double d) {
        super.print(d);
    }

    @Override
    public void print(final float f) {
        super.print(f);
    }

    @Override
    public void print(final int i) {
        super.print(i);
    }

    @Override
    public void print(final long l) {
        super.print(l);
    }

    @Override
    public void print(final Object obj) {
        super.print(obj);
    }

    @Override
    public void print(final String s) {
        super.print(s);
    }

    @Override
    public InternalPrintStream printf(final Locale l, final String format, final Object... args) {
        super.printf(l, format, args);
        return this;
    }

    @Override
    public InternalPrintStream printf(final String format, final Object... args) {
        super.printf(format, args);
        return this;
    }

    @Override
    public void println() {
        super.println();
    }

    @Override
    public void println(final boolean x) {
        super.println(x);
    }

    @Override
    public void println(final char x) {
        super.println(x);
    }

    @Override
    public void println(final char[] x) {
        super.println(x);
    }

    @Override
    public void println(final double x) {
        super.println(x);
    }

    @Override
    public void println(final float x) {
        super.println(x);
    }

    @Override
    public void println(final int x) {
        super.println(x);
    }

    @Override
    public void println(final long x) {
        super.println(x);
    }

    @Override
    public void println(final Object x) {
        super.println(x);
    }

    @Override
    public void println(final String x) {
        super.println(x);
    }

    @Override
    public String toString() {
        return "{stream=" + this.out + '}';
    }

    @Override
    public void write(final byte[] b) throws IOException {
        super.write(b);
    }

    @Override
    public void write(final byte[] b, final int off, final int len) {
        super.write(b, off, len);
    }

    @Override
    public void write(final int b) {
        super.write(b);
    }
}

⏎ org/apache/logging/log4j/io/internal/InternalPrintStream.java

Or download all of them as a single archive file:

File name: log4j-iostreams-2.14.1-sources.jar
File size: 43404 bytes
Release date: 2021-03-06
Download 

⇒ Source Code for Apache Log4j Web Servlet Containers

⇐ Source Code for Apache Log4j to SLF4J Adapter

⇑ Downloading and Reviewing Apache Log4j Packages

⇑⇑ FAQ for Apache Log4j