Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

Jackson Databind Source Code files are provided in the source packge (jackson-databind-2.12.4-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Databind Source Code below:

⏎ com/fasterxml/jackson/databind/jsonFormatVisitors/JsonValueFormat.java

package com.fasterxml.jackson.databind.jsonFormatVisitors;

import com.fasterxml.jackson.annotation.JsonValue;

/**
 * This enum represents the encoded format for a jsonSchema value type
 * @author jphelan
 *
 */
public enum JsonValueFormat
{
    /**
     * This is a CSS color (like "#FF0000" or "red"), based on CSS
         2.1 [W3C.CR-CSS21-20070719].
     */
    COLOR("color"),

    /**
     * This SHOULD be a date in the format of YYYY-MM-DD.  It is
     recommended that you use the "date-time" format instead of "date"
     unless you need to transfer only the date part.
     */
    DATE("date"),

    /**
	 * This SHOULD be a date in ISO 8601 format of YYYY-MM-
      DDThh:mm:ssZ in UTC time.  This is the recommended form of date/
      timestamp.
	 */
    DATE_TIME("date-time"),

    /**
     * This SHOULD be an email address.
     */
    EMAIL("email"),

    /**
     * This SHOULD be a host-name.
     */
    HOST_NAME("host-name"),
     
    /**
     * This SHOULD be an ip version 4 address.
     */
    IP_ADDRESS("ip-address"),

    /**
     * This SHOULD be an ip version 6 address.
     */
    IPV6("ipv6"),

    /**
     * This SHOULD be a phone number (format MAY follow E.123).
     */
    PHONE("phone"),

    /**
     * A regular expression, following the regular expression
     * specification from ECMA 262/Perl 5.
     */
    REGEX("regex"),

    /**
     * This is a CSS style definition (like "color: red; background-
  	* color:#FFF"), based on CSS 2.1 [W3C.CR-CSS21-20070719].
  	*/
    STYLE("style"),

    /**
     * This SHOULD be a time in the format of hh:mm:ss.  It is
     * recommended that you use the "date-time" format instead of "time"
     * unless you need to transfer only the time part.
     */
    TIME("time"),

    /**
     * This value SHOULD be a URI.
     */
    URI("uri"),

    /**
     * This SHOULD be the difference, measured in
      milliseconds, between the specified time and midnight, 00:00 of
      January 1, 1970 UTC.  The value SHOULD be a number (integer or
      float).
     */
    UTC_MILLISEC("utc-millisec"),

    /**
     * Value should be valid <a href="https://en.wikipedia.org/wiki/Universally_unique_identifier">UUID</a>
     *
     * @since 2.10
     */
    UUID("uuid")
    ;

    private final String _desc;

    private JsonValueFormat(String desc) {
        _desc = desc;
    }

    @Override
    @JsonValue // since 2.7
    public String toString() { return _desc; }
}

⏎ com/fasterxml/jackson/databind/jsonFormatVisitors/JsonValueFormat.java

 

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