Source Code for Apache Log4j Core Implementation

Apache Log4j Core Implementation provides the functional components of the logging system. Users are free to create their own plugins and include them in the logging configuration. Apache Log4j Core is a required module to use Apache Log4j.

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

Source Code files for Apache Log4j API 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 Core Implementation 2.14.1 below.

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org/apache/logging/log4j/core/util/IOUtils.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.core.util;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;

/**
 * Copied from Apache Commons IO revision 1686747.
 */
public class IOUtils {

    /**
     * The default buffer size ({@value}) to use for
     * {@link #copyLarge(InputStream, OutputStream)}
     * and
     * {@link #copyLarge(Reader, Writer)}
     */
    private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;

    /**
     * Represents the end-of-file (or stream).
     */
    public static final int EOF = -1;

    /**
     * Copies chars from a <code>Reader</code> to a <code>Writer</code>.
     * <p/>
     * This method buffers the input internally, so there is no need to use a
     * <code>BufferedReader</code>.
     * <p/>
     * Large streams (over 2GB) will return a chars copied value of
     * <code>-1</code> after the copy has completed since the correct
     * number of chars cannot be returned as an int. For large streams
     * use the <code>copyLarge(Reader, Writer)</code> method.
     *
     * @param input the <code>Reader</code> to read from
     * @param output the <code>Writer</code> to write to
     * @return the number of characters copied, or -1 if &gt; Integer.MAX_VALUE
     * @throws NullPointerException if the input or output is null
     * @throws IOException          if an I/O error occurs
     * @since 1.1
     */
    public static int copy(final Reader input, final Writer output) throws IOException {
        final long count = copyLarge(input, output);
        if (count > Integer.MAX_VALUE) {
            return -1;
        }
        return (int) count;
    }

    /**
     * Copies chars from a large (over 2GB) <code>Reader</code> to a <code>Writer</code>.
     * <p/>
     * This method buffers the input internally, so there is no need to use a
     * <code>BufferedReader</code>.
     * <p/>
     * The buffer size is given by {@link #DEFAULT_BUFFER_SIZE}.
     *
     * @param input the <code>Reader</code> to read from
     * @param output the <code>Writer</code> to write to
     * @return the number of characters copied
     * @throws NullPointerException if the input or output is null
     * @throws IOException          if an I/O error occurs
     * @since 1.3
     */
    public static long copyLarge(final Reader input, final Writer output) throws IOException {
        return copyLarge(input, output, new char[DEFAULT_BUFFER_SIZE]);
    }

    /**
     * Copies chars from a large (over 2GB) <code>Reader</code> to a <code>Writer</code>.
     * <p/>
     * This method uses the provided buffer, so there is no need to use a
     * <code>BufferedReader</code>.
     * <p/>
     *
     * @param input the <code>Reader</code> to read from
     * @param output the <code>Writer</code> to write to
     * @param buffer the buffer to be used for the copy
     * @return the number of characters copied
     * @throws NullPointerException if the input or output is null
     * @throws IOException          if an I/O error occurs
     * @since 2.2
     */
    public static long copyLarge(final Reader input, final Writer output, final char[] buffer) throws IOException {
        long count = 0;
        int n;
        while (EOF != (n = input.read(buffer))) {
            output.write(buffer, 0, n);
            count += n;
        }
        return count;
    }

    /**
     * Gets the contents of a <code>Reader</code> as a String.
     * <p/>
     * This method buffers the input internally, so there is no need to use a
     * <code>BufferedReader</code>.
     *
     * @param input the <code>Reader</code> to read from
     * @return the requested String
     * @throws NullPointerException if the input is null
     * @throws IOException          if an I/O error occurs
     */
    public static String toString(final Reader input) throws IOException {
        final StringBuilderWriter sw = new StringBuilderWriter();
        copy(input, sw);
        return sw.toString();
    }

}

org/apache/logging/log4j/core/util/IOUtils.java

 

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