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.

⏎ org/apache/logging/log4j/core/jackson/MapEntry.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.jackson;

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

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;

/**
 * <p>
 * <em>Consider this class private.</em>
 * </p>
 * <p>
 * Used to represent map entries in a generic fashion because the default Jackson behavior uses the key as the element tag. Using the key as
 * an element/property name would mean that you cannot have a generic JSON/XML schema for all log event.
 * </p>
 */
@JsonPropertyOrder({ "key", "value" })
final class MapEntry {

    @JsonProperty
    @JacksonXmlProperty(isAttribute = true)
    private String key;

    @JsonProperty
    @JacksonXmlProperty(isAttribute = true)
    private String value;

    @JsonCreator
    public MapEntry(@JsonProperty("key") final String key, @JsonProperty("value") final String value) {
        this.setKey(key);
        this.setValue(value);
    }

    @Override
    public boolean equals(final Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof MapEntry)) {
            return false;
        }
        final MapEntry other = (MapEntry) obj;
        if (this.getKey() == null) {
            if (other.getKey() != null) {
                return false;
            }
        } else if (!this.getKey().equals(other.getKey())) {
            return false;
        }
        if (this.getValue() == null) {
            if (other.getValue() != null) {
                return false;
            }
        } else if (!this.getValue().equals(other.getValue())) {
            return false;
        }
        return true;
    }

    public String getKey() {
        return this.key;
    }

    public String getValue() {
        return this.value;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((this.getKey() == null) ? 0 : this.getKey().hashCode());
        result = prime * result + ((this.getValue() == null) ? 0 : this.getValue().hashCode());
        return result;
    }

    public void setKey(final String key) {
        this.key = key;
    }

    public void setValue(final String value) {
        this.value = value;
    }

    @Override
    public String toString() {
        return Strings.EMPTY + this.getKey() + "=" + this.getValue();
    }
}

⏎ org/apache/logging/log4j/core/jackson/MapEntry.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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