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/pattern/FormattingInfo.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.pattern;

import org.apache.logging.log4j.util.PerformanceSensitive;

/**
 * Modifies the output of a pattern converter for a specified minimum and maximum width and alignment.
 */
@PerformanceSensitive("allocation")
public final class FormattingInfo {
    /**
     * Array of spaces.
     */
    private static final char[] SPACES = new char[] { ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ' };

    /**
     * Array of zeros.
     */
    private static final char[] ZEROS = new char[] { '0', '0', '0', '0', '0', '0', '0', '0' };

    /**
     * Default instance.
     */
    private static final FormattingInfo DEFAULT = new FormattingInfo(false, 0, Integer.MAX_VALUE, true);

    /**
     * Minimum length.
     */
    private final int minLength;

    /**
     * Maximum length.
     */
    private final int maxLength;

    /**
     * Alignment.
     */
    private final boolean leftAlign;

    /**
     * Left vs. right-hand side truncation.
     */
    private final boolean leftTruncate;

    /**
     * Use zero-padding instead whitespace padding
     */
    private final boolean zeroPad;

    /**
     * Creates new instance.
     *
     * @param leftAlign
     *            left align if true.
     * @param minLength
     *            minimum length.
     * @param maxLength
     *            maximum length.
     * @param leftTruncate
     *            truncates to the left if true
     */
    public FormattingInfo(final boolean leftAlign, final int minLength, final int maxLength, final boolean leftTruncate) {
        this(leftAlign, minLength, maxLength, leftTruncate, false);
    }

    /**
     * Creates new instance.
     *
     * @param leftAlign
     *            left align if true.
     * @param minLength
     *            minimum length.
     * @param maxLength
     *            maximum length.
     * @param leftTruncate
     *            truncates to the left if true
     * @param zeroPad
     *            use zero-padding instead of whitespace-padding
     */
    public FormattingInfo(final boolean leftAlign, final int minLength, final int maxLength, final boolean leftTruncate, final boolean zeroPad) {
        this.leftAlign = leftAlign;
        this.minLength = minLength;
        this.maxLength = maxLength;
        this.leftTruncate = leftTruncate;
        this.zeroPad = zeroPad;
    }

    /**
     * Gets default instance.
     *
     * @return default instance.
     */
    public static FormattingInfo getDefault() {
        return DEFAULT;
    }

    /**
     * Determine if left aligned.
     *
     * @return true if left aligned.
     */
    public boolean isLeftAligned() {
        return leftAlign;
    }

    /**
     * Determine if left truncated.
     *
     * @return true if left truncated.
     */
    public boolean isLeftTruncate() {
		return leftTruncate;
	}

    /**
     * Determine if zero-padded.
     *
     * @return true if zero-padded.
     */
    public boolean isZeroPad() {
        return zeroPad;
    }

    /**
     * Get minimum length.
     *
     * @return minimum length.
     */
    public int getMinLength() {
        return minLength;
    }

    /**
     * Get maximum length.
     *
     * @return maximum length.
     */
    public int getMaxLength() {
        return maxLength;
    }

    /**
     * Adjust the content of the buffer based on the specified lengths and alignment.
     *
     * @param fieldStart
     *            start of field in buffer.
     * @param buffer
     *            buffer to be modified.
     */
    public void format(final int fieldStart, final StringBuilder buffer) {
        final int rawLength = buffer.length() - fieldStart;

        if (rawLength > maxLength) {
			if (leftTruncate) {
				buffer.delete(fieldStart, buffer.length() - maxLength);
			} else {
				buffer.delete(fieldStart + maxLength, fieldStart + buffer.length());
			}
        } else if (rawLength < minLength) {
            if (leftAlign) {
                final int fieldEnd = buffer.length();
                buffer.setLength(fieldStart + minLength);

                for (int i = fieldEnd; i < buffer.length(); i++) {
                    buffer.setCharAt(i, ' ');
                }
            } else {
                int padLength = minLength - rawLength;

                final char[] paddingArray= zeroPad ? ZEROS : SPACES;

                for (; padLength > paddingArray.length; padLength -= paddingArray.length) {
                    buffer.insert(fieldStart, paddingArray);
                }

                buffer.insert(fieldStart, paddingArray, 0, padLength);
            }
        }
    }

    /**
     * Returns a String suitable for debugging.
     *
     * @return a String suitable for debugging.
     */
    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        sb.append(super.toString());
        sb.append("[leftAlign=");
        sb.append(leftAlign);
        sb.append(", maxLength=");
        sb.append(maxLength);
        sb.append(", minLength=");
        sb.append(minLength);
        sb.append(", leftTruncate=");
        sb.append(leftTruncate);
        sb.append(", zeroPad=");
        sb.append(zeroPad);
        sb.append(']');
        return sb.toString();
    }

}

org/apache/logging/log4j/core/pattern/FormattingInfo.java

 

Or download all of them as a single archive file:

File name: log4j-core-2.14.1-sources.jar
File size: 1281358 bytes
Release date: 2021-03-06
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